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Maslow, J N; Mulligan, M E; Arbeit, R D
Escherichia coli is the most common gram-negative organism associated with bacteremia. While recurrent E. coli urinary tract infections are well-described, recurrent E. coli bacteremia appears to be uncommon, with no episodes noted in multiple series of patients with gram-negative bacteremias. We report on 5 patients with recurrent bloodstream infections identified from a series of 163 patients with E. coli bacteremia. For each patient, the isolates from each episode were analyzed by pulsed-field gel electrophoresis (PFGE) and ribotyping and for the presence of E. coli virulence factors. For each of four patients, the index and recurrent episodes of bacteremia represented the same strain as defined by PFGE, and the strains were found to carry one or more virulence factors. The remaining patient, with two episodes of bloodstream infection separated by a 4-year interval, was infected with two isolates that did not carry any virulence factors and that were clonally related by ribotype analysis but differed by PFGE. All five patients had either a local host defense defect (three patients) or impaired systemic defenses (one patient) or both (one patient). Thus, recurrent E. coli bacteremia is likely to represent a multifactorial process that occurs in patients with impaired host defenses who are infected with virulent isolates. Images PMID:7910828
Suzuki, Masashi; Satoh, Nobuhiko; Nakamura, Motonobu; Horita, Shoko; Seki, George; Moriya, Kyoji
Infection is a common complication and is the second leading cause of death in hemodialysis patients. The risk of bacteremia in hemodialysis patients is 26-fold higher than in the general population, and 1/2-3/4 of the causative organisms of bacteremia in hemodialysis patients are Gram-positive bacteria. The ratio of resistant bacteria in hemodialysis patients compared to the general population is unclear. Several reports have indicated that hemodialysis patients have a higher risk of methicillin-resistant Staphylococcus aureus infection. The most common site of infection causing bacteremia is internal prostheses; the use of a hemodialysis catheter is the most important risk factor for bacteremia. Although antibiotic lock of hemodialysis catheters and topical antibiotic ointment can reduce catheter-related blood stream infection (CRBSI), their use should be limited to necessary cases because of the emergence of resistant organisms. Systemic antibiotic administration and catheter removal is recommended for treating CRBSI, although a study indicated the advantages of antibiotic lock and guidewire exchange of catheters over systemic antibiotic therapy. An infection control bundle recommended by the Center for Disease Control and Prevention succeeded in reducing bacteremia in hemodialysis patients with either a catheter or arteriovenous fistula. Appropriate infection control can reduce bacteremia in hemodialysis patients. PMID:27872830
Jensen, Allan Garlik
Staphylococcus aureus bacteremia (SAB) is still associated with a high mortality, and knowledge on risk factors and the clinical and the therapeutic aspects of SAB is still limited. This thesis focuses on the clinical aspects of SAB and its metastatic infections. In a study of all patients with bacteremia in Copenhagen County October 1992 through April 1993 (study I) we emphasized previous findings, that S. aureus is one of the most frequent pathogens in bacteremia, and in a case control study also in Copenhagen County 1994-95 (study II) we demonstrated, that not only an inserted central venous catheter and nasal S. aureus carriage but also hyponatremia and anemia are important risk factors for hospital-acquired SAB (study II). Studies on the treatment of SAB have pointed out, that the eradication of a primary is important, but there are only limited clinical studies dealing with antibiotic treatment. By logistic regression analysis, we were able to demonstrate that focus eradication is essential, but also that treatment with dicloxacillin 1 g x 4 or 2 g x 3 are superior to 1 g x 3 (studie III), indicating that the time for serum concentration above the Minimal Inhibitory Concentration (MIC) for the bacteria plays a role in the outcome of SAB treatment. S. aureus osteomyelitis secondary to SAB is frequently observed. No other countries, however, have a centralized registration, which make it possible to evaluate a large number of these patients. Since 1960, The Staphylococcal Laboratory, Statens Serum Institut in Copenhagen, has registrated selected clinical informations from nearly all patients with positive blood cultures of S. aureus. Based on this registration, we were able to show an increased number of S. aureus osteomyelitis among older patients and a decreased number of S. aureus osteomyelitis of femur and tibia among younger infants in the period 1980-90 (study IV). By reviewing the records of a large number of patients with vertebral S. aureus
Zhang, Cecelia; Manninen, Katja; Touchberry, Joanne; Greene, Shermalyn R.; Holland, Thomas L.
Kerstersia spp. are an unusual cause of human infections. We report the first known case of bacteremia and sepsis due to Kerstersia gyiorum, in a patient with chronic lower-extremity ulcers, and we review the literature on this uncommon pathogen. PMID:25809974
Aubin, Guillaume Ghislain; Haloun, Alain; Treilhaud, Michèle; Reynaud, Alain
We describe the first case of bacteremia due to Gallibacterium anatis. The patient, a 26-year-old woman, developed bacteremia and diarrhea. The origin of infection was possibly due to a diet contaminated by G. anatis in this highly immunocompromised patient. PMID:23966514
Mikals, Kyle; Masel, Jennifer; Gleeson, Todd
Campylobacter fetus bacteremia is a rare human infection that occurs almost exclusively in the setting of advanced age, immunosuppression, human immunodeficiency virus infection, alcoholism, or recent gastrointestinal surgery. This report of C. fetus bacteremia in a 39-year-old immunocompetent traveler who ate raw beef identifies C. fetus as a potential emerging pathogen in normal hosts. PMID:25071002
Wang, I-Kuan; Chang, Yi-Chih; Liang, Chih-Chia; Chuang, Feng-Rong; Chang, Chiz-Tzung; Lin, Hsin-Hung; Lin, Chung-Chih; Yen, Tzung-Hai; Lin, Po-Chang; Chou, Che-Yi; Huang, Chiu-Ching; Tsai, Wen-Chen; Chen, Jin-Hua
To analyze the incidence rates and risk factors for bacteremia in patients undergoing hemodialysis (HD) and peritoneal dialysis (PD). The records of 898 consecutive patients undergoing dialysis from January 2003 to December 2008 were reviewed retrospectively. Episodes of bacteremia were recorded. China Medical University (Taichung, Taiwan). The overall incidence rate of bacteremia was 7.63 per 100 patient-years in HD patients and 3.56 per 100 patient-years in PD patients and it was higher in HD patients each year from 2003 to 2008. S. aureus (27.53%) was the most common pathogen in HD patients, whereas Coagulase-negative Staphylococcus (21.3%) was the most common pathogen in PD patients. Vascular access infection was the most common etiology in HD patients, whereas peritonitis was the most common etiology in PD patients. Older age, shorter dialysis vintage, use of HD rather than PD, current smoker, use of a venous dialysis catheter, presence of diabetes mellitus, higher comorbidity score, and lower serum albumin were significant risk factors for bacteremia. Diabetes mellitus and lower serum albumin were significant risk factors for bacteremia-associated mortality. Placement of a permanent access (fistula, graft, or PD catheter) prior to initiation of dialysis, smoking cessation, and better nutritional status (i.e. higher serum albumin) were associated with a reduced risk of bacteremia in dialysis patients. Higher serum albumin was also associated with a reduced bacteremia-associated mortality.
Hagiya, Hideharu; Ogawa, Hiroko; Takahashi, Yusuke; Kimura, Kosuke; Hasegawa, Kan; Otsuka, Fumio
We herein present a rare case of Actinomyces turicensis bacteremia that was caused by pyometra. The patient was successfully treated with transvaginal drainage and antibiotic therapy. A literature review in MEDLINE showed that there have been only 8 previously reported cases of A. turicensis bacteremia. This infection frequently occurs in patients with visceral abscesses, and blood culture examinations usually reveal a polymicrobial pattern. However, the prognosis of such patients has been reported to generally be benign. Due to difficulties in performing bacterial identification and the wide-spectrum clinical pictures associated with this bacteremia, no comprehensive understanding of the clinical features of each Actinomyces species has yet been established.
Gold, H S; Karchmer, A W
The majority of cases of Staphylococcus aureus bacteremia are hospital-acquired, and most are associated with infected intravenous catheters. Preventive measures, early detection of infections, and strategies for effective treatment have become matters of increasing urgency.
Were, T.; Davenport, G. C.; Hittner, J. B.; Ouma, C.; Vulule, J. M.; Ong'echa, J. M.; Perkins, D. J.
Since the etiologies and clinical outcomes of bacteremia in children with Plasmodium falciparum infections, particularly in areas of holoendemic malaria transmission, are largely unexplored, blood cultures and comprehensive clinical, laboratory, hematological, and nutritional parameters for malaria-infected children (aged 1 to 36 months, n = 585 patients) were investigated at a rural hospital in western Kenya. After the exclusion of contaminant microorganisms, the prevalence of bacteremia was 11.7% in the cohort (n = 506), with nontyphoidal Salmonella spp. being the most common isolates (42.4%). Bacteremia was found to occur in a significantly higher proportion of females than males and was associated with elevated blood glucose concentrations and lowered malaria parasite and hemoglobin (Hb) levels compared to those in abacteremic participants. In addition, the incidences of respiratory distress and severe malarial anemia (SMA; Hb level of <6.0g/dl) were nonsignificantly greater in children with bacteremia. Mortality was 8.5-fold higher in children with bacteremia. Multivariate logistic regression analyses revealed that bacteremia was significantly associated with reduced incidences of high-density parasitemia (HDP; ≥10,000/μl) and increased incidences of malnutrition (i.e., underweight; weight-for-age Z score of <−2 using the NCHS system). Since previous studies showed that bacteremia caused by Gram-negative organisms is associated with enhanced anemia and mortality, multivariate logistic regression was also performed separately for randomly age- and gender-matched children with bacteremia caused by Gram-negative organisms (n = 37) and for children found to be abacteremic (n = 74). These results revealed that the presence of bacteremia caused by Gram-negative organisms was significantly associated with reduced HDP, enhanced susceptibility to respiratory distress, SMA (Hb level of <6.0 g/dl), and being underweight (Z score, <−2). Data presented here from a
Mikals, Kyle; Masel, Jennifer; Gleeson, Todd
Campylobacter fetus bacteremia is a rare human infection that occurs almost exclusively in the setting of advanced age, immunosuppression, human immunodeficiency virus infection, alcoholism, or recent gastrointestinal surgery. This report of C. fetus bacteremia in a 39-year-old immunocompetent traveler who ate raw beef identifies C. fetus as a potential emerging pathogen in normal hosts. © The American Society of Tropical Medicine and Hygiene.
McCarthy, P L; Grundy, G W; Spiesel, S Z; Dolan, T F
In a 20-month period, 1,783 children seen in the pediatric outpatient department had blood cultures performed and 117 (6.5%) of these children had bacteremia. Two thirds of the isolates were Diplococcus pneumoniae and Hemophilus influenzae b. Ninety-three percent of children with H. influenzae b bacteremia and 20% of children with pneumococcal bacteremia had soft tissue involvement at the initial visit. Most children with positive blood cultures (102) were previously well and beyond the newborn period and many (46) had seemingly trivial illnesses initially: upper respiratory tract infection, fever of unknown origin, otitis media, and diarrhea. In the absence of soft tissue infection, the latter three diagnoses correlated best with bloodstream invasion. Nineteen children had persistent bacteremia and five developed soft tissue complications not noted initially. Two factors, age between 7 and 24 months and temperature between 39.4 and 40.6 C, showed increased specificity for bacteremia but were sensitive only for pneumococcal disease. A temperature larger than or equal to 40.5 C showed more specificity for bacteremia than lesser fevers. A white blood cell count greater than 20,000/cu mm was poorly sensitive, and pulmonary infiltrates were neither specific nor sensitive for positive blood cultures. Five bacteremic children had aseptic lymphocytosis in the cerebrospinal fluid. Two days of intravenous antibiotic therapy and eight days of oral therapy were adequate for pneumococcal bacteremia without soft tissue involvement. This therapy may not be without soft tissue involvement. This therapy may not be ideal, however, since other routes and duration of therapy were not evaluated.
Mekitarian Filho, Eduardo; Carvalho, Werther Brunow de
To summarize the main clinical entities associated with fever without source (FWS) in infants, as well as the clinical management of children with occult bacteremia, emphasizing laboratory tests and empirical antibiotics. A non-systematic review was conducted in the following databases--PubMed, EMBASE, and SciELO, between 2006 and 2015. The prevalence of occult bacteremia has been decreasing dramatically in the past few years, due to conjugated vaccination against Streptococcus pneumoniae and Neisseria meningitidis. Additionally, fewer requests for complete blood count and blood cultures have been made for children older than 3 months presenting with FWS. Urinary tract infection is the most prevalent bacterial infection in children with FWS. Some known algorithms, such as Boston and Rochester, can guide the initial risk stratification for occult bacteremia in febrile infants younger than 3 months. There is no single algorithm to estimate the risk of occult bacteremia in febrile infants, but pediatricians should strongly consider outpatient management in fully vaccinated infants older than 3 months with FWS and good general status. Updated data about the incidence of occult bacteremia in this environment after conjugated vaccination are needed. Copyright © 2015 Sociedade Brasileira de Pediatria. Published by Elsevier Editora Ltda. All rights reserved.
Hung, C C; Chang, S C; Chen, Y C; Hsieh, W C; Luh, K T
Listeria monocytogenes has been recognized as an important pathogen in immunocompromised patients, but it has been rarely reported in Taiwan. We reviewed 13 cases of L. monocytogenes bacteremia at National Taiwan University Hospital over a 12-year period. All of the patients had underlying diseases. Fever was the most common presenting symptom, and neurologic signs were found in 6 patients. Most of the patients received penicillin G, ampicillin or piperacillin with an aminoglycoside. Corticosteroids were used in 9 of 13 patients. The overall mortality directly due to L. monocytogenes bacteremia was 31%. However, patients treated with cephalosporins or oxacillin had higher mortality than those treated with penicillin G, ampicillin or piperacillin (p = 0.05). Given the increasing number of immunosuppressed patients in Taiwan, it is likely that more cases will be encountered. Physicians in Taiwan should be aware of L. monocytogenes bacteremia and its treatment.
Brouqui, P; Lascola, B; Roux, V; Raoult, D
Infection with Bartonella quintana can cause trench fever, endocarditis, bacillary angiomatosis, and peliosis. An outbreak of bacteremia due to B. quintana has been reported among homeless people in Seattle, and the seroprevalence is high among homeless people in both the United States and Europe. Body lice are known to be the vectors of B. quintana. We studied all the homeless people who presented in 1997 to the emergency departments of the University Hospital, Marseilles, France. Blood was collected for microimmunofluorescence testing for antibodies against B. quintana and for culture of the bacterium. Body lice were collected and analyzed by the polymerase chain reaction and sequencing of a portion of the citrate synthase gene of B. quintana. In 10 of 71 homeless patients (14 percent), blood cultures were positive for B. quintana, and 21 of the patients (30 percent) had high titers of antibody against the organism. A total of 17 patients (24 percent) had evidence of recent infection (bacteremia or seroconversion). Tests of lice from 3 of the 15 patients from whom they were collected were positive for B. quintana. The homeless people with B. quintana bacteremia were more likely to have been exposed to lice (P=0.002), were more likely to have headaches (P=0.03) and severe leg pain (P<0.001), and had lower platelet counts (P=0.006) than the homeless people who were seronegative for B. quintana and did not have bacteremia; 8 of the 10 patients with bacteremia were afebrile. Five patients had chronic bacteremia, as indicated by positive blood cultures over a period of several weeks. In an outbreak of urban trench fever among homeless people in Marseilles, B. quintana infections were associated with body lice in patients with nonspecific symptoms or no symptoms.
Robert, J; Moreno, A; Martínez, J A; Almela, M; Jiménez de Anta, M T; Soriano, E
Yersinia spp infection in human people are increasing attention last thirty years. We have reviewed the bacteremia in our hospital last five years. Three episodes were Yersinia spp bacteremia. Presence of disease or predisponent therapy were present in most of episodes. All patients were more than seventy years old. The septic metastasis were present in all the cases: one with meningitis, other with liver abscess and one with septic arthritis. We have documented a good clinical evolution, though the mortality in different reports is around 50%. The election therapy for all episodes were cephalosporins, and in two cases we added quinolones.
Blennow, Ola; Westling, Katarina; Fröding, Inga; Ozenci, Volkan
Kytococcus schroeteri, a saprophyte of the human skin, may cause serious infections in the immunocompromised host. Here, we describe a case of pneumonia and bacteremia due to Kytococcus schroeteri in an immunocompromised patient, successfully treated with linezolid and trimethoprim-sulfamethoxazole.
Westling, Katarina; Fröding, Inga; Özenci, Volkan
Kytococcus schroeteri, a saprophyte of the human skin, may cause serious infections in the immunocompromised host. Here, we describe a case of pneumonia and bacteremia due to Kytococcus schroeteri in an immunocompromised patient, successfully treated with linezolid and trimethoprim-sulfamethoxazole. PMID:22162554
Perrin, Monique; Bemer, Michel; Delamare, Catherine
Listeria innocua is widespread in the environment and in food. This species has to date never been described in association with human disease. We report a case of fatal bacteremia caused by L. innocua in a 62-year-old patient. PMID:14605191
Perrin, Monique; Bemer, Michel; Delamare, Catherine
Listeria innocua is widespread in the environment and in food. This species has to date never been described in association with human disease. We report a case of fatal bacteremia caused by L. innocua in a 62-year-old patient.
of Table 1.-Principal Species in Groups bacteremia due to some member of each group. Such Group organisms (%) - 1 Providencia stuartii (23) 100- 203...have died with what ap- dencia stuartii . In the succeeding five years, during which peared to be lethal staphylococcal infection; this study silver
Özdemir, Tayfun; Öksüz, Lütfiye; Gürler, Nezahat
Objectives: The aims of this study were to investigate the incidence of bacteremia, bacteriology and antibiotic susceptibility against to causative bacteria associated with dental implant installation. Study Design: 30 generally healthy patients were enrolled in this study. Blood samples were collected at baseline and at 30 minutes after dental implant installation and 24 hours after dental implant surgery. Blood samples were cultured in a BACTEC system. The isolated bacteria were identified using conventional methods. Antimicrobial sensitivity tests were performed by disc diffusion. Results: No bacteria were isolated at the baseline and 24 hours after surgery, whereas the prevalence of bacteremia at 30 minutes after dental implant installation was 23%. The isolated bacteria species were Staphylococcus epidermidis, Eubacterium spp., Corynebacterium spp. and Streptococcus viridans. The Staphylococcus epidermidis, which was isolated in three patients, was found to be resistant to penicillin which is first choice of many clinicians. Conclusion: Our findings suggest that installation of dental implants can produce bacteremia. Within the limitations of this study, it can be speculated that the resistance of antibiotics may compromise the routine prophylaxis against infective endocarditis. Therefore use of blood cultures and antibiograms may be suggested in risky patients. The outcome of the present study should be verified using a larger patient group with varying conditions. Key words: Dental implant, bacteremia, infective endocarditis, antibiotic prophylaxis. PMID:22157668
Parekh, Jai; Townley, Theresa
We present the case of a 61-year-old Caucasian gentleman who presented with a one-day history of fever, chills, and altered mental status. His symptoms were initially thought to be secondary to cellulitis. Blood cultures grew Pasteurella multocida, a rare pathogen to cause bacteremia. Our patient was treated with ciprofloxacin for two weeks and made a complete and uneventful recovery. Our patient's uncontrolled diabetes mellitus and chronic kidney disease put him at a higher risk for developing serious P. multocida infection. The patient's dog licking the wounds on his legs was considered as the possible source of infection. As P. multicoda bacteremia is rare, but severe with a high mortality rate, it is imperative to have a high index of suspicion for this infection especially in the vulnerable immunocompromised population. PMID:27847521
De Luca, Concetta; Mancin, Annalisa; Calabrò, Maria; Daleno, Cristina; Ferrario, Antonella; Renzulli, Raffaella; Scuderi, Cristina; Casari, Erminia
We report a case of Helicobacter pylori transient bacteremia in a woman with ulcerated antral gastric cancer. The patient was hospitalized for laparoscopy and subtotal gastrectomy. After surgery she developed fever (39°C) and was empirically treated with levofloxacin. Blood cultures, collected and sent immediately to Laboratory, were positive for a spiral Gram-negative bacterium. This isolate was identified as H. pylori and the specific susceptibility test was performed. One day after the fever was decreased but antibiotic treatment with levofloxacin was continued and it was maintained until discharge. In summary, H. pylori transient bacteremia may occur as a rare complication after stomach surgery. Further studies are necessary to elucidate the potential role of Helicobacter pylori presence in blood.
Pérez Trallero, E; López Lopategui, C; Fernández Pérez, F
Shigella bacteremia is very uncommon, although it is known to occur in Shigella infection. Three cases of Shigella flexneri bacteremia are reported, two of them diagnosed at the Residencia Ntra. Sra. de Aránzazu of San Sebastián, and another at the Ciudad Sanitaria Francisco Franco of Barcelona. In spite of the frequency of Shigella infections in Spain, no cases of Shigella bacteriemia had been heretofore reported from our country. One of the patients was an alcoholic woman who died in coma and renal failure. The other two cases were children who had an uneventful recovery. Stool cultures were positive for Shigella flexneri in two of the three patients. In the third the bacillus could not be isolated from the stools in spite of three consecutive cultures.
Ifantidou, Athina M; Diamantidis, Michael D; Tseliki, Georgia; Angelou, Argiri S; Christidou, Photini; Papa, Anna; Pentilas, Demetrius
Corynebacterium jeikeium, frequently encountered in clinical specimens, is part of the normal skin flora. Nevertheless, a few cases of C. jeikeium bacteremia followed by severe clinical manifestations have been reported. C. jeikeium has been reported to cause endocarditis, septicemia, meningitis, pneumonia and osteomyelitis, along with soft tissue and trauma infections. Herein we describe a case of C. jeikeium bacteremia in Greece. The isolation of a coryneform bacterium from a clinical specimen should not immediately be considered a superinfection by the skin flora. Clinical and laboratory investigations are essential in order to evaluate such cases before applying appropriate treatment. On the other hand, the association of coryneform bacteria and disease should be critically investigated, with a thorough identification of the strain, ideally beyond the classical methods, at a specialized center.
Halim, Ilham; Ihbibane, Fatima; Belabbes, Houria; Zerouali, Khalid; El Mdaghri, Naima
The species Bordetella trematum was first described in 1996. Currently only eleven cases were published. We describe the first case of Bordetella trematum issued from bacteremia with a patient who has severe burns in Morocco. The identification was not possible by conventional microbiological methods where the resort to 16S ARNr sequencing. The use of molecular methods, including sequencing of the 16S ARNr, is currently an essential complementary tool to identify microbiological pathogens.
Llinares, Pedro; Iribarren, José Antonio
Community-acquired bacteremias assciated with healthcare and, especially, those of nosocomial origin, are mainly caused by Gram-positive microorganisms. Notable among this group are Staphylococcus spp, with an incidence of methicillin resistance of approximately 30% in S. aureus and of 70% in coagulase-negative staphylococcus, which is higher in patients admitted to intensive care units. Vancomycin has been the most widely used antibiotic in these situations but its toxicity, especially in the kidney, and reports of failure when used for the treatment of methicillin-resistant S. aureus (MRSA) and with a vancomycin MIC > 1 mg/L have led to the search for other treatments. Daptomycin is a new lipopeptide antibiotic that has been shown to be not inferior to vancomycin in a pivotal clinical trial in patients with bacteremia and right endocarditis due to S. aureus. Recent guidelines and consensus documents place daptomycin as an ideal alternative in these situations, indicating its use in MRSA bacteremia with a vancomycin MIC > 1 mg/L, as well as in patients whose renal dysfunction excludes the use of vancomycin therapy. Evidence of worse prognosis in MRSA bacteremia when empirical treatment is inappropriate has led to the recommendation of daptomycin as the first-choice drug in critically ill patients with suspected Gram-positive bacteremic infection and renal dysfunction and/or in hospitals where there is a high prevalence of MRSA with a MIC > 1 mg/L. The recommended dose in severely ill patients should be higher than 6 mg/kg/day.
Leistner, R; Bloch, A; Gastmeier, P; Schwab, F
In a previous study, we demonstrated prolonged length of hospital stay in cases of extended-spectrum beta-lactamase (ESBL)-positive K. pneumoniae bacteremia compared to bacteremia cases due to E. coli (ESBL-positive and -negative) and ESBL-negative K. pneumoniae. The overall mortality was significantly higher in bacteremia cases resulting from ESBL-positive pathogens but also in K. pneumoniae cases disregarding ESBL-production. In order to examine whether pathogen species rather than multidrug resistance might affect mortality risk, we reanalyzed our dataset that includes 1.851 cases of bacteremia.
Dai, Julia; Huen, Auris O; Kestenbaum, Lori A; Sarezky, Margaret D; Coughlin, Carrie C; Yan, Albert C
Achromobacter xylosoxidans is a rare, opportunistic infection most commonly encountered in immunocompromised patients during hospitalization. Primary uncomplicated bacteremia, catheter-associated infections, and pneumonia have been reported as the most common clinical presentations; skin and soft tissue infections from A. xylosoxidans are rare. We describe a case of A. xylosoxidans presenting as cellulitis and bacteremia in an immunocompromised patient.
Dai, Julia; Huen, Auris O.; Kestenbaum, Lori A.; Sarezky, Margaret D.; Coughlin, Carrie C.; Yan, Albert C.
Achromobacter xylosoxidans is a rare, opportunistic infection most commonly encountered among immunocompromised patients during hospitalization. Primary uncomplicated bacteremia, catheter-associated infections, and pneumonia have been reported as the most common clinical presentations, but skin and soft tissue infections from A. xylosoxidans are rare. We describe a case of A. xylosoxidans presenting as cellulitis and bacteremia in an immunocompromised patient. PMID:25973735
Reitman, Aaron J; Pisk, Rhonda M; Gates, John V; Ozeran, J Daniel
Our objective was to evaluate serial procalcitonin (PCT) levels compared with an initial PCT level at admission in predicting bacteremia in pediatric febrile neutropenic oncology patients. Serum PCT levels were measured at admission (t0) and within 24 hours of admission (t1) in pediatric oncology patients presenting with fever and neutropenia. A blood culture was collected at t0 and monitored for 5 days for bacterial growth. PCT value of 0.5 ng/mL at either t0 or t1 was considered predictive for bacteremia. PCT levels were significantly higher in children with positive blood cultures than with negative blood cultures. Serial PCT values mirrored t1 values. Serial PCT showed 76% specificity and negative predictive value of 93% in ruling out bacteremia. Elevated PCT levels are predictive of bacteremia. Using serial PCT levels within 24 hours allowed a better prediction of bacteremia than the PCT level at t0.
Louwen, R.; van Baarlen, P.; van Vliet, A. H. M.; van Belkum, A.; Hays, J. P.; Endtz, H. P.
Bacteria belonging to the species Campylobacter are the most common cause of bacterial diarrhoea in humans. The clinical phenotype associated with Campylobacter infections ranges from asymptomatic conditions to severe colitis and bacteremia. In susceptible patients, Campylobacter infections are associated with significant morbidity and mortality, with both host factors and bacterial factors being involved in the pathogenesis of bacteremia. In the host, age, gender and immune-compromising conditions may predispose for Campylobacter infections, whilst the most important bacterial determinants mentioned in the literature are cytotoxin production and flagellar motility. The role of sialylated lipo-oligosaccharide (LOS) and serum resistance in bacteremia is inconclusive at this time, and the clinical significance of Campylobacter bacteremia is not yet fully understood. More emphasis on the detection of Campylobacter species from blood cultures in susceptible patients at risk for Campylobacter infections will increase our understanding of the pathogenesis and the relevance of Campylobacter bacteremia. PMID:24611124
Hilliard, Nicholaus J; Schelonka, Robert L; Waites, Ken B
Bacillus cereus is an uncommon but potentially serious bacterial pathogen causing infections of the bloodstream, lungs, and central nervous system of preterm neonates. A case of bacteremia caused by B. cereus in a 19-day-old preterm neonate who was successfully treated with vancomycin, tobramycin, meropenem, and clindamycin is described. Implications for the diagnostic laboratory and clinicians when Bacillus species are detected in normally sterile sites are discussed, and the small numbers of infant infections proven to be due to this organism that have been described previously are reviewed.
Gómez-Garcés, José Luis; Oteo, Jesús; García, Guadalupe; Aracil, Belén; Alós, Juan Ignacio; Funke, Guido
Dermabacter hominis is a gram-positive, catalase-positive, glucose-fermenting rod, which, as it grows forms small greyish-white colonies with a characteristic pungent odor. Previously known as coryneform Centers for Disease Control and Prevention groups 3 and 5, it was catalogued as D. hominis in 1994. Various strains isolated in blood cultures, abscesses, or wounds in the 1970s were retrospectively characterized in referral centers as D. hominis. In this report we describe two patients with severe underlying pathology who developed bacteremias by D. hominis within the context of their clinical pictures. PMID:11376092
Mycobacterium neoaurum (M. neoaurum) is an infrequently encountered cause of infection in humans. It is a member of the rapidly growing mycobacteria family. It predominately afflicts those with a compromised immune status and a chronically indwelling vascular access. Isolation of this organism is challenging yet the advent of 16s ribosomal sequencing paved the way for more sensitive detection. No treatment guidelines are available and treatment largely depends on the experience of the treating physician and nature of the isolate. We report a case of M. neoaurum bacteremia in an immune competent host, with a chronically placed peripherally inserted central catheter (PICC line). PMID:27807489
Parino, Eduardo; Mulinaris, Eric; Saccomano, Edgardo; Gallo, Juan Cruz; Kohan, Gabriel
A 34-year-old female patient presented with fever and right flank pain ten days after uncomplicated vaginal delivery. CT examination revealed right ovarian vein thrombosis and methicillin-resistant Staphylococcus aureus (MRSA) was isolated from blood cultures. No other source of bacteremia was found. Antibiotic therapy and anticoagulation with enoxaparin were instituted. Fourteen days after admission, she was discharged in good condition. Although a very uncommon complication after spontaneous vaginal delivery, septic ovarian vein thrombophlebitis should be suspected in cases of persistent puerperal fever when other diagnostic possibilities have been excluded. PMID:26221549
Corredoira, J C; Alonso, M P; García, J F; Casariego, E; Coira, A; Rodriguez, A; Pita, J; Louzao, C; Pombo, B; López, M J; Varela, J
The aim of this study was to determine the clinical significance of Streptococcus salivarius isolates recovered from blood cultures and compare them with isolates of Streptococcus bovis biotypes I and II. Seventeen of the 52 (32%) S. salivarius isolates recovered were considered clinically significant, compared with 62 of the 64 (97%) S. bovis isolates (p<0.0001). Bacteremia caused by S. salivarius occurred mostly in patients who showed relevant disruption of the mucous membranes and/or serious underlying diseases. Patients with S. salivarius bacteremia were younger than those with S. bovis bacteremia (57 vs. 67 years; p<0.01). Patients with S. salivarius bacteremia and patients with S. bovis II bacteremia had similar rates of endocarditis, colon tumors, and non-colon cancer. On the other hand, when compared with S. bovis I bacteremia, S. salivarius bacteremia was associated with lower rates of endocarditis (18% vs. 74%, respectively) (p<0.01) and colon tumors (0% vs. 57%, respectively) (p<0.005) and higher rates of non-colon cancer (53% vs. 9.5%, respectively) (p<0.01). Bacteremia caused by S. bovis II had a hepatobiliary origin in 50% of the patients, while, in contrast, that due to S. salivarius or S. bovis I was less frequently associated with a hepatobiliary origin (12% and 5%, respectively) (p<0.00001). The rate of penicillin resistance was 31% among S. salivarius isolates and 0% among S. bovis isolates (p<0.0001). In conclusion, the clinical characteristics of S. salivarius bacteremia and S. bovis II bacteremia are similar, and the isolation of S. salivarius in blood should not be systematically regarded as contamination.
Micaelo, Maïté; Rasmy, Pascal; Amara, Marlène; Lambert, Juliette; Coutard, Aymeric; Pangon, Béatrice
Erysipelothrix rhusiopathiae, a Gram-positive bacillus, is reported to cause for cutaneous infections and endocarditis. We report a case of E. rhusiopathiae bacteremia without severe clinical illness. The patient, a 74-year-old man, is suffering from a chronic lymphoid leukemia (LLC). Following a trauma, the patient developed a bruise on the left inch. Because the site of shock seemed clinically infected, oral amoxicilline-acid clavulanic (AAC) treatment was started after withdrawn 1 set of blood cultures. These blood culture specimens yielded a Gram-positive bacillus identified as E. rhusiopathiae by mass spectrometry MALDI-TOF (Microflex Brüker). The strain was sensitive to beta-lactam, fluoroquinolones and macrolides, resistant to vancomycin (natural resistance), and amikacin but sensitive to gentamicin. After 5 days of treatment by AAC, the patient became apyretic. One year after this episode, we reported no further symptoms of infection, or endocarditis. The natural resistance of E. rhusiopathiae in glycopeptides underlines the importance of a microbiological diagnosis. Indeed, vancomycine can be the treatment of first intention in Gram-positive bacillus bacteremia. The identification of bacteria using mass spectrometry is available the same day of the blood culture positivity and allows to prescribe the most adapted antibiotic treatment for the patient.
Yu, Jing; Wang, Xiong; Zhu, Yaowu; Lu, Yanjun; Sun, Ziyong
Increasing evidence suggests that FOXO1, one critical gene related to the human immune system, probable is closely to the human infection. In the present study we aimed to investigate genetic association of FOXO1 with bacteremia in Han Chinese. 188 patients with bacteremia diagnosed with blood culture and 250 healthy blood donors without signs of infection were studied, two tagging SNPs of FOXO1 (rs9532571, rs3751436) were selected and genotyped using predesigned TaqMan allelic discrimination assays. The results showed that the allele frequency of rs9532571 and rs3751436 in FOXO1 was not associated with an increased risk of bacteremia (P=0.762, OR=1.05, 95% CI 0.77-1.43; P=0.059, OR=1.34, 95% CI 0.99-1.81 respectively), the genotype distribution of these two SNPs was also not significantly different between bacteremia patients and control groups (P=0.9; P=0.16). Haplotypes in this block were not significantly associated with bacteremia risk. Conclusion: the association between FOXO1 genetic polymorphism and bacteremia has not been observed in the study, maybe a larger sample population and more SNPs in the FOXO1 need to reveal the role in bacteremia in the future. PMID:26629162
Woods, T D; Watanakunakorn, C
We reviewed cases of Providencia stuartii bacteremia at a large community teaching hospital during a 12-year period (1981 to 1992). None of the infections were hospital-acquired. Of the 49 patients, 47 (96%) came from a nursing home, and 45 (92%) had a long-term indwelling Foley catheter. The urinary tract was definitely proven to be the source of bacteremia in 35 patients (71%) and was the probable source in another 5 patients (11%). Polymicrobial bacteremia occurred in 25 patients (51%). The overall mortality rate during hospitalization was 25%.
di Meo, Nicola; Stinco, Giuseppe; Gubertini, Nicoletta; Patriarca, Maria Martina; Trevisan, Giusto
In recent years, group G Streptococcus has been reported with increasing frequency as the cause of a variety of human infections. Underlying host factors such as immunosuppression, malignancy, diabetes mellitus, and rheumatoid arthritis may be predisposing conditions leading to infection. Toxic involvement and post-streptococcal sequalae, once believed to be exclusive to infections caused by group A Streptococcus, are now known to occur following acute group G Streptococcus and group C Streptococcus infections. We report on a case of group G Streptococcus bacteremia and recurrent cellulitis with toxic involvement. Patient blood cultures were always negative for β-hemolytic Streptococci in all the recurrences, except during the last one. Antibiotic therapy based on antibiogram quickly resolved the infection. A regimen of intramuscular injection of 1.2 million units of benzathine penicillin every 15 days for one year prevented recurrences of cellulitis.
Dicpinigaitis, Peter V.; De Aguirre, Manuel; Divito, Joseph
Infection with Enterococcus hirae has rarely been reported in humans but is not uncommon in mammals and birds. We describe a case of Enterococcus hirae bacteremia associated with acute pancreatitis, acute cholecystitis, and septic shock responsive to antibiotic therapy and supportive critical care management. Unique aspects of this case of Enterococcus hirae bacteremia are its association with acute pancreatitis and its geographical origin. To our knowledge, this is the first report of Enterococcus hirae bacteremia occurring in a patient in the United States. Although human infection with this organism appears to be rare, all cases reported to date describe bacteremia associated with severe and life-threatening illness. Thus, physicians need to be cognizant of the clinical significance of this heretofore little recognized pathogen. PMID:26417465
Rouzic, N; Héry-Arnaud, G; Jaffuel, S; Garo, B; Payan, C; Garré, M
Shewanella putrefaciens is rarely involved in human infectious disease. We report here a case of soft tissue infection with bacteremia on a patient with risk factors (liver cirrhosis, diabetes mellitus). Copyright © 2011 Elsevier Masson SAS. All rights reserved.
Mory, Francine; Carlier, Jean-Philippe; Alauzet, Corentine; Thouvenin, Maxime; Schuhmacher, Hélène; Lozniewski, Alain
Metronidazole resistance among Prevotella spp. is rare. We report here the first case of bacteremia due to a high-level metronidazole-resistant Prevotella sp. responsible for treatment failure. PMID:16208024
Skov, Marianne N.; Justesen, Ulrik S.
We report two cases of bacteremia with the anaerobic bacterium Ruminococcus gnavus. In both cases, the bacteremia was associated with diverticular disease. Preliminary conventional identification suggested peptostreptococci, and matrix-assisted laser desorption ionization–time of flight mass spectrometry (MALDI-TOF MS) analysis did not produce scores high enough for species identification. Finally, the bacteria were identified by 16S rRNA gene sequencing. PMID:23363832
Chapagain, Bikash; Joshi, Astha; Brennessel, Debra J.
Crucial to the management of staphylococcal bacteremia is an accurate evaluation of associated endocarditis, which has both therapeutic and prognostic implications. Because the clinical presentation of endocarditis can be nonspecific, the judicious use of echocardiography is important in distinguishing patients at high risk of developing endocarditis. In the presence of high-risk clinical features, an early transesophageal echocardiogram is warranted without prior transthoracic echocardiography. The purpose of this study was to investigate the clinical risk factors for staphylococcal infective endocarditis that might warrant earlier transesophageal echocardiography and to describe the incidence of endocarditis in cases of methicillin-resistant and methicillin-sensitive Staphylococcus aureus bacteremia. A retrospective case-control study was conducted by means of chart review of 91 patients consecutively admitted to a community hospital from January 2009 through January 2013. Clinical risk factors of patients with staphylococcal bacteremia were compared with risk factors of patients who had definite diagnoses of infective endocarditis. There were 69 patients with bacteremia alone (76%) and 22 patients with endocarditis (24%), as verified by echocardiography. Univariate analysis showed that diabetes mellitus (P=0.024), the presence of an automatic implantable cardioverter-defibrillator/pacemaker (P=0.006) or a prosthetic heart valve (P=0.003), and recent hospitalization (P=0.048) were significantly associated with developing infective endocarditis in patients with S. aureus bacteremia. The incidence of methicillin-resistant and methicillin-sensitive S. aureus bacteremia was similar in the bacteremia and infective-endocarditis groups (P=0.437). In conclusion, identified high-risk clinical factors in the presence of bacteremia can suggest infective endocarditis. Early evaluation with transesophageal echocardiography might well be warranted. PMID:28265207
Hofmans, M; Boel, A; Van Vaerenbergh, K; De Beenhouwer, H
Staphylococcus saprophyticus is a well-known cause of uncomplicated urinary tract infections, especially in young and sexually active women. Presence in blood cultures is rare and often attributed to contamination. When bacteremia is significant, it occurs mostly in patients with hematologic malignancies and is predominantly catheter-related. However, we describe a case of significant bacteremia with S. saprophyticus associated with urinary tract infection after extracorporeal shock wave lithotripsy of an ureterolithiasis in an otherwise healthy patient.
Henao-Martínez, Andrés F.; González-Fontal, Guido R.; Castillo-Mancilla, José R.; Yang, Ivana V.
Summary Background Enterobacteriaceae bacteremia is a common complication in patients with neoplasm. The cancer itself, chemotherapy-induced immunosuppression, and other cancer-related procedures play a role as predisposing factors for this condition. However, despite the clear association between cancer and Enterobacteriaceae bacteremia, the distinctive clinical characteristics of patients with cancer presenting with Enterobacteriaceae bacteremia have not been well established. Methods The population studied was a prospective cohort of adult hospitalized patients with Enterobacteriaceae bacteremia in a tertiary care hospital. We compared the clinical variables and microbiological features between patients with an underlying neoplasm (n = 203) and those without (n = 259). STATA software was used for statistical association analysis. Results In a bivariate analysis, older age, prior exposure to aminopenicillins, fewer days of symptoms, biliary source of bacteremia, greater severity of APACHE II score, lower white blood cell and platelet counts, and the presence of Klebsiella pneumoniae were more common in the neoplasm group. In a multivariable analysis, K. pneumoniae bacteremia (odds ratio (OR) 6.13, 95% confidence interval (CI) 1.65–22.71; p = 0.007), APACHE II score (OR 1.18, 95% CI 1.05–1.34; p = 0.007), and exposure to aminopenicillins (OR 28.84, 95% CI 1.94–429.3; p = 0.015) were associated with neoplasm. K. pneumoniae bacteremia was more commonly present in patients with lung and gastrointestinal cancers. Conclusions We have confirmed the association of K. pneumoniae bacteremia with underlying neoplastic disease, especially with gastrointestinal malignancies, which may allow stratification for initial empiric antibiotic therapy in this subset of patients. Prior exposure to aminopenicillins in the neoplasm group might contribute to this finding. PMID:23313157
Kizilbash, Quratulain F; Petersen, Nancy J; Chen, Guoqing J; Naik, Aanand D; Trautner, Barbara W
Although catheter-associated urinary tract infection (CAUTI) and catheter-associated asymptomatic bacteriuria (CAABU) are clinically distinct conditions, most literature describing the risks of bacteriuria does not distinguish between them. We studied the relationship between catheter-associated bacteriuria and bacteremia from a urinary source in CAUTI relative to that in CAABU. Second, we investigated whether the presence or absence of urinary symptoms in catheterized patients with bacteriuria was associated with bacteremia from any source or mortality. Finally, we explored the effect of antimicrobial treatment of bacteriuria on subsequent bacteremia from any source and mortality. We performed a retrospective cohort study with 30 days of follow-up after an initial positive urine culture. CAUTI and CAABU were defined by Infectious Diseases Society of America guidelines. A large tertiary care facility. All inpatients with a urinary catheter (external or indwelling) and a positive urine culture between October 2010 and June 2011. We captured 444 episodes of catheter-associated bacteriuria in 308 patients; 128 (41.6%) patients had CAUTI, and 180 (58.4%) had CAABU. Three episodes of bacteriuria were followed by bacteremia from a urinary source (0.7%). CAUTI, rather than CAABU, was associated with bacteremia from any source, but neither CAUTI nor CAABU predicted subsequent mortality. Use of antimicrobial agents to treat bacteriuria was not associated with either bacteremia from any source or mortality. Bacteremia from a urinary source was infrequent, and there was no evidence of an association of mortality with symptomatic versus asymptomatic bacteriuria in this population. Antibiotic treatment of bacteriuria did not affect outcomes.
Jensen, Slade O.; Vaska, Vikram L.; Espedido, Björn A.; Paterson, David L.; Gosbell, Iain B.
Summary: Staphylococcus aureus bacteremia (SAB) is an important infection with an incidence rate ranging from 20 to 50 cases/100,000 population per year. Between 10% and 30% of these patients will die from SAB. Comparatively, this accounts for a greater number of deaths than for AIDS, tuberculosis, and viral hepatitis combined. Multiple factors influence outcomes for SAB patients. The most consistent predictor of mortality is age, with older patients being twice as likely to die. Except for the presence of comorbidities, the impacts of other host factors, including gender, ethnicity, socioeconomic status, and immune status, are unclear. Pathogen-host interactions, especially the presence of shock and the source of SAB, are strong predictors of outcomes. Although antibiotic resistance may be associated with increased mortality, questions remain as to whether this reflects pathogen-specific factors or poorer responses to antibiotic therapy, namely, vancomycin. Optimal management relies on starting appropriate antibiotics in a timely fashion, resulting in improved outcomes for certain patient subgroups. The roles of surgery and infectious disease consultations require further study. Although the rate of mortality from SAB is declining, it remains high. Future international collaborative studies are required to tease out the relative contributions of various factors to mortality, which would enable the optimization of SAB management and patient outcomes. PMID:22491776
van Hal, Sebastian J; Jensen, Slade O; Vaska, Vikram L; Espedido, Björn A; Paterson, David L; Gosbell, Iain B
Staphylococcus aureus bacteremia (SAB) is an important infection with an incidence rate ranging from 20 to 50 cases/100,000 population per year. Between 10% and 30% of these patients will die from SAB. Comparatively, this accounts for a greater number of deaths than for AIDS, tuberculosis, and viral hepatitis combined. Multiple factors influence outcomes for SAB patients. The most consistent predictor of mortality is age, with older patients being twice as likely to die. Except for the presence of comorbidities, the impacts of other host factors, including gender, ethnicity, socioeconomic status, and immune status, are unclear. Pathogen-host interactions, especially the presence of shock and the source of SAB, are strong predictors of outcomes. Although antibiotic resistance may be associated with increased mortality, questions remain as to whether this reflects pathogen-specific factors or poorer responses to antibiotic therapy, namely, vancomycin. Optimal management relies on starting appropriate antibiotics in a timely fashion, resulting in improved outcomes for certain patient subgroups. The roles of surgery and infectious disease consultations require further study. Although the rate of mortality from SAB is declining, it remains high. Future international collaborative studies are required to tease out the relative contributions of various factors to mortality, which would enable the optimization of SAB management and patient outcomes.
Kleinschmidt, Sharon; Huygens, Flavia; Faoagali, Joan; Rathnayake, Irani U; Hafner, Louise M
Staphylococcus epidermidis is a biofilm-producing commensal organism found ubiquitously on human skin and mucous membranes, as well as on animals and in the environment. Biofilm formation enables this organism to evade the host immune system. Colonization of percutaneous devices or implanted medical devices allows bacteria access to the bloodstream. Isolation of this organism from blood cultures may represent either contamination during the blood collection procedure or true bacteremia. S. epidermidis bloodstream infections may be indolent compared with other bacteria. Isolation of S. epidermidis from a blood culture may present a management quandary for clinicians. Over-treatment may lead to patient harm and increases in healthcare costs. There are numerous reports indicating the difficulty of predicting clinical infection in patients with positive blood cultures with this organism. No reliable phenotypic or genotypic algorithms currently exist to predict the pathogenicity of a S. epidermidis bloodstream infection. This review will discuss the latest advances in identification methods, global population structure, pathogenicity, biofilm formation, antimicrobial resistance and clinical significance of the detection of S. epidermidis in blood cultures. Previous studies that have attempted to discriminate between invasive and contaminating strains of S. epidermidis in blood cultures will be analyzed.
Lau, Susanna K P; Chow, Wang-Ngai; Foo, Chuen-Hing; Curreem, Shirly O T; Lo, George Chi-Shing; Teng, Jade L L; Chen, Jonathan H K; Ng, Ricky H Y; Wu, Alan K L; Cheung, Ingrid Y Y; Chau, Sandy K Y; Lung, David C; Lee, Rodney A; Tse, Cindy W S; Fung, Kitty S C; Que, Tak-Lun; Woo, Patrick C Y
Unlike Elizabethkingia meningoseptica, the clinical importance of E. anophelis is poorly understood. We determined the clinical and molecular epidemiology of bacteremia caused by Elizabethkingia-like species from five regional hospitals in Hong Kong. Among 45 episodes of Elizabethkingia-like bacteremia, 21 were caused by Elizabethkingia, including 17 E. anophelis, three E. meningoseptica and one E. miricola; while 24 were caused by other diverse genera/species, as determined by 16S rRNA gene sequencing. Of the 17 cases of E. anophelis bacteremia, 15 (88%) were clinically significant. The most common diagnosis was pneumonia (n = 5), followed by catheter-related bacteremia (n = 4), neonatal meningitis (n = 3), nosocomial bacteremia (n = 2) and neutropenic fever (n = 1). E. anophelis bacteremia was commonly associated with complications and carried 23.5% mortality. In contrast, of the 24 episodes of bacteremia due to non-Elizabethkingia species, 16 (67%) were clinically insignificant. Compared to non-Elizabethkingia bacteremia, Elizabethkingia bacteremia was associated with more clinically significant infections (P < 0.01) and positive cultures from other sites (P < 0.01), less polymicrobial bacteremia (P < 0.01), and higher complication (P < 0.05) and mortality (P < 0.05) rates. Elizabethkingia bacteremia is predominantly caused by E. anophelis instead of E. meningoseptica. Elizabethkingia bacteremia, especially due to E. anophelis, carries significant morbidity and mortality, and should be considered clinically significant unless proven otherwise.
Uwamino, Yoshifumi; Muranaka, Kiyoharu; Hase, Ryota; Otsuka, Yoshihito; Hosokawa, Naoto
There are growing numbers of reports concerning the clinical and pathological features of Helicobacter cinaedi (H. cinaedi) bacteremia; however, few reports have discussed the features of this condition in healthy individuals. A retrospective observational study was conducted at a Japanese tertiary care hospital to assess the clinical features of community-acquired H. cinaedi. All patients in whom H. cinaedi was isolated between January 2009 and March 2014 were identified from the hospital database. Of the 28 patients included in the study, 12 had community-acquired H. cinaedi bacteremia. The most common clinical feature was cellulitis (n = 17). However, nearly half of the patients with healthcare-associated or nosocomial-associated bacteremia displayed no symptoms with the exception of fever. Most patients were successfully treated with a 14-day regime of third-generation cephalosporins or tetracycline. Our results show that H. cinaedi infections are quite common in immunocompetent community-dwelling individuals. © 2015 John Wiley & Sons Ltd.
Yokouchi, Yukako; Katsumori, Hiroshi; Koike, Yuji
Group B streptococcus (GBS) infection remains a leading cause of serious neonatal and early infantile infection. As the infection often presents with nonspecific symptoms, and is associated with underlying bacteremia, prompt investigation and treatment is required. We report a case of late, late-onset GBS infection with bacteremia in a 94-day-old boy experiencing cellulitis of the left hand. Although late-onset disease or late, late-onset disease has been reported to be common among infants with underlying conditions such as premature birth, immunocompromised status, trauma, or among those using medical devices, no such underlying medical condition predisposed this infant to invasive GBS infection. Recent reports including the present case underscore the risk of GBS infection among previously healthy infants beyond the neonatal period. Thus, clinicians should especially be aware of unusual presentations of GBS invasive disease with bacteremia.
Masood, Umair; Sharma, Anuj; Lowe, Dhruv; Khan, Rashad; Manocha, Divey
Streptococcus anginosus is part of the normal flora of the human gastrointestinal tract. Their ability to cause abscesses is very unique and sets them apart from the rest of the streptococci groups. While an association of group D streptococcus bacteremia and endocarditis with colorectal carcinoma is well established, S. anginosus infections are rarely implicated with colonic malignancy. We present a case of a 62-year-old male who presented to the hospital with fatigue and generalized abdominal pain. Computed tomography of the abdomen revealed multiple liver abscesses and rectal thickening. Blood cultures were found to grow S. anginosus bacteria. Colonoscopy revealed a rectal mass which was later confirmed to be rectal adenocarcinoma. This case presents an association between S. anginosus bacteremia and presence of colorectal cancer which has been highlighted in only a few case reports in literature. This should prompt clinicians to screen for colorectal cancer in patients with S. anginosus bacteremia. PMID:28100999
Dauby, Nicolas; Libois, Agnès; Van Broeck, Johan; Delmée, Michel; Vandenberg, Olivier; Martiny, Delphine
Extra-colonic infections, and especially bacteremia, are infrequent manifestations of Clostridium difficile infection. C. difficile bacteremia is generally health-care associated and polymicrobial. We report the case of a patient on hunger strike that presented a C. difficile colitis and mono-microbial bacteremia on its admission to the hospital. Multilocus variable number tandem repeat analysis of stool and blood isolates indicated clonality. The strain was characterized as a ribotype 002, an emerging ribotype previously associated with high fatality rate. The patient received treatment by intra-venous amoxicillin-clavulanate and oral vancomycin but eventually died on the seventh day of admission with concomitant pneumonia and pulmonary embolism. Copyright © 2016 Elsevier Ltd. All rights reserved.
Fernández-Esparrach, Gloria; Sendino, Oriol; Araujo, Isis; Pellisé, Maria; Almela, Manel; González-Suárez, Begoña; López-Cerón, María; Córdova, Henry; Sanabria, Erwin; Uchima, Hugo; Llach, Josep; Ginès, Àngels
The incidence of bacteremia after endoscopic ultrasonography (EUS) or EUS-guided fine-needle aspiration (EUS-FNA) is between 0% and 4%, but there are no data on this topic in cirrhotic patients. To prospectively assess the incidence of bacteremia in cirrhotic patients undergoing EUS and EUS-FNA. We enrolled 41 cirrhotic patients. Of these, 16 (39%) also underwent EUS-FNA. Blood cultures were obtained before and at 5 and 30 min after the procedure. When EUS-FNA was used, an extra blood culture was obtained after the conclusion of radial EUS and before the introduction of the sectorial echoendoscope. All patients were clinically followed up for 7 days for signs of infection. Blood cultures were positive in 16 patients. In 10 patients, blood cultures grew coagulase-negative Staphylococcus, Corynebacterium species, Propionibacterium species or Acinetobacterium Lwoffii, which were considered contaminants (contamination rate 9.8%, 95% CI: 5.7-16%). The remaining 6 patients had true positive blood cultures and were considered to have had true bacteremia (15%, 95% CI: 4-26%). Blood cultures were positive after diagnostic EUS in five patients but were positive after EUS-FNA in only one patient. Thus, the frequency of bacteremia after EUS and EUS-FNA was 12% and 6%, respectively (95% CI: 2-22% and 0.2-30%, respectively). Only one of the patients who developed bacteremia after EUS had a self-limiting fever with no other signs of infection. Asymptomatic Gram-positive bacteremia developed in cirrhotic patients after EUS and EUS-FNA at a rate higher than in non-cirrhotic patients. However, this finding was not associated with any clinically significant infections. Copyright © 2013 Elsevier España, S.L. and AEEH y AEG. All rights reserved.
Artero, Arturo; Esparcia, Ana; Eiros, José M; Madrazo, Manuel; Alberola, Juan; Nogueira, José M
The clinical effect of bacteremia on outcomes in urinary tract infection (UTI) is still debated. This study aims to examine the clinical effect of bacteremia in elderly patients with UTI requiring hospital admission. This retrospective observational study recorded the clinical features, microbiology and outcomes in a Spanish cohort of patients aged ≥65 years hospitalized for UTI in whom blood cultures were performed in the emergency department. The primary outcome of the study was in-hospital mortality. Of 333 patients, with a mean age of 81.6 years, 137 (41.1%) had positive blood cultures. Escherichia coli, with 223 (66.9%) cases, was the most common microorganism isolated. Independent risk factors of bacteremia were temperature >38°C, heart rate >90bpm and inversely both Enterococcus faecalis and Pseudomonas aeruginosa. Bacteremia was not associated with the length of stay in hospital (6.96 ± 3.50 days versus 7.33 ± 5.54 days, P = 0.456). Mortality rate was 9.3% with no significant difference between bacteremic and nonbacteremic cases (8.8% and 9.7%, respectively, P = 0.773). In-hospital mortality analyzed by logistic regression was associated with McCabe index >2 (20.5% survival versus 66.7% death, adjusted odds ratio = 6.31, 95% CI: 2.71-14.67; P < 0.001) but not with bacteremia (41.4% survival versus 38.7% death, adjusted odds ratio = 0.99, 95% CI: 0.43-2.29; P = 0.992). Our study suggests that the presence or absence of bacteremia in elderly people with UTI requiring hospitalization does not have an influence on outcomes such as in-hospital mortality or length of stay. Copyright © 2016 Southern Society for Clinical Investigation. Published by Elsevier Inc. All rights reserved.
Funada, H; Uotani, C; Machi, T; Matsuda, T; Nonomura, A
Bacillus cereus, which used to be considered non-pathogenic, was isolated from the blood of a patient with acute leukemia who was receiving intensive chemotherapy. Fatal bacteremia developed with a clinical syndrome of acute gastroenteritis, followed by both meningoencephalitis with subarachnoid hemorrhage and multiple liver abscesses probably caused by infective vasculitis. Surveillance stool cultures revealed colonization with the organism prior to the onset of diarrhea, and repetitive blood cultures were found to be positive. Thus, this case suggested some new important clinicopathologic features of true B. cereus bacteremia complicating acute leukemia.
Yoshino, Y; Kitazawa, T; Ikeda, M; Tatsuno, K; Yanagimoto, S; Okugawa, S; Ota, Y; Yotsuyanagi, H
We investigated the clinical features of Bacteroides bacteremia for 5 years to determine the risk factors for mortality and to ascertain whether bacteremia due to Bacteroides spp. is associated with colorectal carcinoma. This study comprised a review of all patients with Bacteroides bacteremia at a teaching hospital in Tokyo from April 2003 to March 2008. We also conducted a case-control study between Bacteroides bacteremia and bacteremia due to other pathogens. During the study period, 25 cases of bacteremia were due to Bacteroides spp. Bacteroides bacteremia was associated with a high mortality rate (24%). Malignancy (76%) was the major comorbidity, followed by a history of surgery (40%). Colorectal carcinoma was the most frequent (n = 8, 32%) of the comorbid malignancies and was recognized as the primary infection site in six cases. Prevalence of colorectal carcinoma as comorbidity was significantly higher in Bacteroides bacteremia than in other bacteremia. In the Bacteroides bacteremia cases of this study, colorectal carcinoma was the major comorbidity and primary infection site. Colorectal carcinoma screening in Bacteroides bacteremia patients is potentially an important diagnostic marker for the early detection of this infection in the future.
Ok, Hea Sung; Lee, Hyoun Soo; Park, Man Je; Kim, Ki Hoon; Kim, Byeong Ki; Wi, Yu Mi; Kim, June Myung
The high mortality attributable to persistent methicillin-resistant Staphylococcus aureus (MRSA) bacteremia in spite of glycopeptide treatment has heightened the need for early detection and intervention with alternative agents. The purpose of this study was to determine the clinical characteristics of and risk factors for persistent MRSA bacteremia. All first episodes of significant MRSA bacteremia at a 710-bed academic medical center from November 2009 through August 2010 were recorded. Blood cultures were conducted at 3 days and every 2 to 3 days thereafter until clearance. Clinical characteristics and outcomes were compared between persistent MRSA bacteremia (≥ 7 days) and nonpersistent MRSA bacteremia (≤ 3 days). Of 79 patients with MRSA bacteremia during the study period, 31 (39.2%) had persistent MRSA bacteremia. The persistent MRSA bacteremia group had significantly higher 30-day mortality than the nonpersistent MRSA bacteremia group (58.1% vs. 16.7%, p < 0.001). Multivariate analysis indicated that metastatic infection at presentation (odds ratio [OR], 14.57; 95% confidence interval [CI], 3.52 to 60.34; p < 0.001) and delayed catheter removal in catheter-related infection (OR, 3.80; 95% CI, 1.04 to 13.88; p = 0.004) were independent predictors of persistent MRSA bacteremia. Patients with a time to blood culture positivity (TTP) of < 11.8 hours were at increased risk of persistent MRSA bacteremia (29.0% vs. 8.3%, p = 0.029). High mortality in patients with persistent MRSA bacteremia was noted. Early detection of metastatic infection and early removal of infected intravascular catheters should be considered to reduce the risk of persistent MRSA bacteremia. Further studies are needed to evaluate the role of TTP for predicting persistent MRSA bacteremia.
Duhon, Bryson; Dallas, Steven; Velasquez, Sadie T; Hand, Elizabeth
This case report describes the treatment of a rare infection caused by Staphylococcus lugdunensis with cefazolin and rifampin. A 48-year-old man with significant comorbidities was admitted to our institution with complaints of malaise, shortness of breath, and vague persistent pain. He was diagnosed with S. lugdunensis infective endocarditis and was treated with cefazolin continuous infusion for 10 days without resolution of bacteremia. As surgical intervention was deemed inappropriate, rifampin was added to the treatment regimen for its antibiofilm activity. After rifampin initiation, resolution of bacteremia was rapidly achieved. Subsequent blood cultures remained negative, and the patient was discharged home in stable condition to complete six weeks of i.v. cefazolin and rifampin therapy. The patient continued treatment, as documented by the infusion center, weekly for five weeks. The patient was rehospitalized during his sixth week of treatment due to impending respiratory failure, whereupon he was intubated and admitted to the intensive care unit. The patient's cardiac status gradually worsened over the following days, and he ultimately died. Blood cultures from days 1 and 2 of hospitalization revealed no bacterial growth at five days. Cefazolin and rifampin therapy in a hospitalized patient with bacteremia and aortic valve endocarditis caused by S. lugdunensis resulted in rapid eradication of the bacteremia. After more than five weeks of cefazolin-rifampin treatment, the patient was rehospitalized with worsening cardiac function and died. Blood cultures during the second admission were negative. Copyright © 2015 by the American Society of Health-System Pharmacists, Inc. All rights reserved.
Opota, Onya; Ney, Barbara; Zanetti, Giorgio; Jaton, Katia; Prod'hom, Guy
We report for the first time a case of bacteremia caused by Comamonas kerstersii in a 65-year-old patient with sign of diverticulosis. In addition, we review the isolation of Comamonas sp. and related organisms in our hospital over 25 years. PMID:24371242
John, Anna B; Razak, Eissa A S A; Razak, Emad E M H; Al-Naqeeb, Niran; Dhar, Rita
Although often regarded as a contaminant, Bacillus spp. have been implicated in serious systemic infections. The incidence of such infections is low with only a few cases reported in the literature. We describe the clinical course of early-onset Bacillus cereus bacteremia in a preterm neonate who was successfully treated with vancomycin.
Sarma, Podila S.; Mohanty, Smruti
Capnocytophaga cynodegmi (formerly “DF-2 like organism”), a commensal organism of the canine oral cavity, is a capnophilic, gram-negative, facultative bacillus. C. cynodegmi has rarely been encountered in human diseases. We report the first known case of cellulitis, bacteremia, and pneumonitis caused by C. cynodegmi in a diabetic man from central India following a dog bite. PMID:11326042
Panda, Aruna; Tatarov, Ivan; Masek, Billie Jo; Hardick, Justin; Crusan, Annabelle; Wakefield, Teresa; Carroll, Karen; Yang, Samuel; Hsieh, Yu-Hsiang; Lipsky, Michael M; McLeod, Charles G; Levine, Myron M; Rothman, Richard E; Gaydos, Charlotte A; DeTolla, Louis J
Bacteremia is an important cause of morbidity and mortality in humans. In this study, we focused on the development of an animal model of bacteremia induced by non-typhoidal Salmonella. New Zealand White rabbits were inoculated with a human isolate of non-typhoidal Salmonella strain CVD J73 via the intra-peritoneal route. Blood samples were collected at specific time points and at euthanasia from infected rabbits. Additionally, tissue samples from the heart, lungs, spleen, gastrointestinal tract, liver and kidneys were obtained at euthanasia. All experimentally infected rabbits displayed clinical signs of disease (fever, dehydration, weight loss and lethargy). Tissues collected at necropsy from the animals exhibited histopathological changes indicative of bacteremia. Non-typhoidal Salmonella bacteria were detected in the blood and tissue samples of infected rabbits by microbiological culture and real-time PCR assays. The development of this animal model of bacteremia could prove to be a useful tool for studying how non-typhoidal Salmonella infections disseminate and spread in humans. Copyright © 2014 Elsevier Ltd. All rights reserved.
Panda, Aruna; Tatarov, Ivan; Masek, Billie Jo; Hardick, Justin; Crusan, Annabelle; Wakefield, Teresa; Carroll, Karen; Yang, Samuel; Hsieh, Yu-Hsiang; Lipsky, Michael M.; McLeod, Charles G.; Levine, Myron M.; Rothman, Richard E.; Gaydos, Charlotte A.; DeTolla, Louis J.
Bacteremia is an important cause of morbidity and mortality in humans. In this study, we focused on the development of an animal model of bacteremia induced by non-typhoidal Salmonella. New Zealand White rabbits were inoculated with a human isolate of non-typhoidal Salmonella strain CVD J73 via the intra-peritoneal route. Blood samples were collected at specific time points and at euthanasia from infected rabbits. Additionally, tissue samples from the heart, lungs, spleen, gastrointestinal tract, liver and kidneys were obtained at euthanasia. All experimentally infected rabbits displayed clinical signs of disease (fever, dehydration, weight loss and lethargy). Tissues collected at necropsy from the animals exhibited histopathological changes indicative of bacteremia. Non-typhoidal Salmonella bacteria were detected in the blood and tissue samples of infected rabbits by microbiological culture and real-time PCR assays. The development of this animal model of bacteremia could prove to be a useful tool for studying how non-typhoidal Salmonella infections disseminate and spread in humans. PMID:25033732
Lasry, S; Simon, J; Marais, A; Pouchot, J; Vinceneux, P; Boussougant, Y
We report on the first case of documented Helicobacter cinaedi septic arthritis in an immunocompetent heterosexual young man. The patient presented no identified risk factor except for contact with animals that have been incriminated as a possible source of infection, particularly for these patients. Despite prolonged bacteremia, the response to long-term therapy with ciprofloxacin and rifampin was excellent.
Vähäkuopus, Susanna; Vuopio-Varkila, Jaana; Vuento, Risto; Syrjänen, Jaana
We conducted a retrospective population-based study of 140 episodes of Streptococcus dysgalactiae subsp. equisimilis bacteremia occurring in Finland during 1995–2004. Rare emm types were associated with more severe disease and increased mortality rates. Skin and soft tissue infections were more frequent clinical signs among cases caused by common emm types. PMID:20409380
Rantala, Sari; Vahakuopus, Susanna; Vuopio-Varkila, Jaana; Vuento, Risto; Syrjanen, Jaana
We conducted a retrospective population-based study of 140 episodes of Streptococcus dysgalactiae subsp. equisimilis bacteremia occurring in Finland during 1995-2004. Rare emm types were associated with more severe disease and increased mortality rates. Skin and soft tissue infections were more frequent clinical signs among cases caused by common emm types.
Sasahara, T; Hayashi, S; Morisawa, Y; Sakihama, T; Yoshimura, A; Hirai, Y
We describe an outbreak of Bacillus cereus bacteremia that occurred at Jichi Medical University Hospital in 2006. This study aimed to identify the source of this outbreak and to implement appropriate control measures. We reviewed the charts of patients with blood cultures positive for B. cereus, and investigated B. cereus contamination within the hospital environment. Genetic relationships among B. cereus isolates were analyzed. Eleven patients developed B. cereus bacteremia between January and August 2006. The hospital linens and the washing machine were highly contaminated with B. cereus, which was also isolated from the intravenous fluid. All of the contaminated linens were autoclaved, the washing machine was cleaned with a detergent, and hand hygiene was promoted among the hospital staff. The number of patients per month that developed new B. cereus bacteremia rapidly decreased after implementing these measures. The source of this outbreak was B. cereus contamination of hospital linens, and B. cereus was transmitted from the linens to patients via catheter infection. Our findings demonstrated that bacterial contamination of hospital linens can cause nosocomial bacteremia. Thus, blood cultures that are positive for B. cereus should not be regarded as false positives in the clinical setting.
Gaudreau, C.; Delage, G.; Rousseau, D.; Cantor, E. D.
A review of the hospital records of 71 patients from whose blood viridans streptococci were isolated showed that in 13 cases the patient's illness was definitely related to the bacteremia: 4 patients had endocarditis, 3 had pneumonia, 2 had peritonitis and 1 each had meningitis, a scalp wound infection, sinusitis and otitis media. The bacteremia may have contributed to the two deaths among these 13 patients. In 45 cases the viridans streptococci may have contributed to the patient's illness: 15 patients had an infection of the lower respiratory tract and 7 an infection of the upper respiratory tract, 8 were neonates with suspected septicemia, 3 had soft tissue infections, 3 had leukemia and sepsis, and 9 had miscellaneous infections; the bacteremia was unrelated to the two deaths in this group. In another 13 cases the viridans streptococci could not be related to the patient's illness. The species most frequently isolated were Streptococcus mitis, S. sanguis II and S. MG-intermedius. The outcome of the bacteremia was generally good, even among the 11 patients not treated with antibiotics. When viridans streptococci are cultured from a single blood sample, further samples of blood and, if feasible, specimens from the associated focus of infection should be obtained for culture; further blood cultures are especially important in cases of suspected endocarditis. PMID:7332884
Tang, Tommy Hing-cheung; Cheng, Naomi Hua-yin; Ho, Roy Tsz-chung; Chan, Helen Shuk-ying; Lam, Kwok-wai; Xavier, Jimenez; Wu, Tak-chiu
Shewanella algae and Shewanella putrefaciens have been implicated for causing serious infections in humans, including disseminated infection. We report the possible first case of Shewanella-related Fournier's gangrene and bacteremia caused in a 65-year-old Chinese male with nephrotic syndrome. He was successfully managed by surgical debridement and antibiotic therapy. PMID:27704006
Southern, P M; Kutscher, A E
We report two cases of bacteremia due to Neisseria cinerea. One was a 2.5-yr-old boy with otitis media and pneumonia, who responded to treatment with amoxicillin. The other was a 47-yr-old man with underlying ethanol abuse who developed severe polymicrobial sepsis due to apparent intraabdominal disease. This man died despite extensive antimicrobial therapy.
Pardo-Seco, Jacobo; Gómez-Carballa, Alberto; Martinón-Torres, Nazareth; Martinón-Sánchez, José María; Justicia-Grande, Antonio; Rivero-Calle, Irene; Pinnock, Elli; Salas, Antonio; Fink, Colin
Background The risk of bacteremia is considered low in children with acute bronchiolitis. However the rate of occult bacteremia in infants with RSV infection is not well established. The aim was to determine the actual rate and predictive factors of bacteremia in children admitted to hospital due to confirmed RSV acute respiratory illness (ARI), using both conventional culture and molecular techniques. Methods A prospective multicenter study (GENDRES-network) was conducted between 2011–2013 in children under the age of two admitted to hospital because of an ARI. Among those RSV-positive, bacterial presence in blood was assessed using PCR for Meningococcus, Streptococcus pneumoniae, Haemophilus influenzae, Streptococcus pyogenes, Klebsiella pneumoniae, Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus, in addition to conventional cultures. Results 66 children with positive RSV respiratory illness were included. In 10.6% patients, bacterial presence was detected: H. influenzae (n = 4) and S. pneumoniae (n = 2). In those patients with bacteremia, there was a previous suspicion of bacterial superinfection and had received empirical antibiotic treatment 6 out of 7 (85.7%) patients. There were significant differences in terms of severity between children with positive bacterial PCR and those with negative results: PICU admission (100% vs. 50%, P-value = 0.015); respiratory support necessity (100% vs. 18.6%, P-value < 0.001); Wood-Downes score (mean = 8.7 vs. 4.8 points, P-value < 0.001); GENVIP scale (mean = 17 vs. 10.1, P-value < 0.001); and length of hospitalization (mean = 12.1 vs. 7.5 days, P-value = 0.007). Conclusion Bacteremia is not frequent in infants hospitalized with RSV respiratory infection, however, it should be considered in the most severe cases. PMID:26872131
Cárdenas, Ana María; Andreacchio, Kathleen A; Edelstein, Paul H
Mixed-population (heterogeneous) enterococcal bacteremia (MEB) is rarely reported. Based on one occasion in which Vitek2 missed a vancomycin-resistant subpopulation isolated from a patient, we developed a simple method to detect this subpopulation and determined MEB frequency. The four patients presented here had either Enterococcus faecium or Enterococcus faecalis bacteremia caused by both vancomycin-resistant enterococci (VRE) and vancomycin-susceptible enterococci (VSE). No prior common antibiotic therapy was observed, and bacteremia resolved with daptomycin, gentamicin, and/or linezolid treatment. In two cases, VRE presence was missed by Vitek2. To detect the VRE subpopulation, tryptic soy broth was inoculated from positive blood cultures and a saline suspension was inoculated to a vancomycin (6-μg/ml) (V6) plate. Two isolates from each patient were studied further. Relatedness was assessed by multilocus sequence typing, fitness was evaluated by growth curve and competition assays, and vanA presence was determined by PCR. MEB represented ∼5% of all enterococcal bacteremias. All VRE subpopulations grew on V6 plates but were missed in two instances by Vitek2. VRE and VSE isolates from each patient were closely related and did not differ in overall fitness. All four VRE isolates and 2/4 VSE isolates were vanA positive. MEBs occur regardless of prior antimicrobial therapy, are relatively common in our hospital, and are important to detect. As far as we know, this study is the first to report heterogeneous E. faecalis bacteremia. There is a simple method to detect VRE subpopulations that may be missed by Vitek2.
Kinane, D F; Zhang, P; Benakanakere, M; Singleton, J; Biesbrock, A; Nonnenmacher, C; He, T
Bacteremia and systemic inflammatory markers are associated with periodontal and systemic diseases and may be linking mechanisms between these conditions. We hypothesized that in the development of gingival inflammation, systemic markers of inflammation and bacteremia would increase. To study the effect of bacteremia on systemic inflammatory markers, we recruited 80 subjects to participate in an experimental gingivitis study. Subjects were stratified based on gender, smoking and the number of bleeding sites and then randomized to one of two groups: control group (n = 40) or experimental gingivitis group (n = 40). Subjects in the control group conducted an oral hygiene regimen: brushing twice daily with a regular sodium fluoride cavity protection dentifrice and a standard manual toothbrush, flossing twice daily, and mouth rinsing with an anti-cavity fluoride rinse once daily. The experimental group stopped brushing and flossing, and used only the fluoride anti-cavity mouth rinse for 21 d. Seventy-nine of 80 subjects were evaluable. One subject in the control group was excluded from the results due to antibiotic use during the study. Our data showed the experimental gingivitis group exhibited a significant (p < 0.05) increase in dental plaque level and gingival inflammatory indices relative to baseline and the control group but a decrease in bacteremia and soluble intercellular adhesion molecule-1 levels vs. baseline. Bacteremia was negatively correlated with gingival inflammatory indices and soluble intercellular adhesion molecule-1 levels in the experimental gingivitis group, thus negating our hypothesis. We conclude that there are marked differences in systemic cytokine levels over the course of short-term experimentally induced gingivitis and further conclude that a long-term periodontitis study must be considered to address mechanisms whereby oral diseases may affect systemic diseases. © 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.
Choi, Hee Kyoung; Kim, Young Keun; Kim, Hyo Youl; Park, Jeong Eun
Background/Aims Providencia species frequently colonize urinary catheters and cause urinary tract infections (UTIs); however, bacteremia is uncommon and not well understood. We investigated the clinical features of Providencia bacteremia and the antibiotic susceptibility of Providencia species. Methods We identified cases of Providencia bacteremia from May 2001 to April 2013 at a tertiary care hospital. The medical records of pertinent patients were reviewed. Results Fourteen cases of Providencia bacteremia occurred; the incidence rate was 0.41 per 10,000 admissions. The median age of the patients was 64.5 years. Eleven cases (78.6%) were nosocomial infections and nine cases (64.3%) were polymicrobial bacteremia. The most common underlying conditions were cerebrovascular/neurologic disease (n = 10) and an indwelling urinary catheter (n = 10, 71.4%). A UTI was the most common source of bacteremia (n = 5, 35.7%). The overall mortality rate was 29% (n = 4); in each case, death occurred within 4 days of the onset of bacteremia. Primary bacteremia was more fatal than other types of bacteremia (mortality rate, 75% [3/4] vs. 10% [1/10], p = 0.041). The underlying disease severity, Acute Physiologic and Chronic Health Evaluation II scores, and Pitt bacteremia scores were significantly higher in nonsurvivors (p = 0.016, p =0.004, and p = 0.002, respectively). Susceptibility to cefepime, imipenem, and piperacillin/tazobactam was noted in 100%, 86%, and 86% of the isolates, respectively. Conclusions Providencia bacteremia occurred frequently in elderly patients with cerebrovascular or neurologic disease. Although Providencia bacteremia is uncommon, it can be rapidly fatal and polymicrobial. These characteristics suggest that the selection of appropriate antibiotic therapy could be complicated in Providencia bacteremia. PMID:25750564
Choi, Hee Kyoung; Kim, Young Keun; Kim, Hyo Youl; Park, Jeong Eun; Uh, Young
Providencia species frequently colonize urinary catheters and cause urinary tract infections (UTIs); however, bacteremia is uncommon and not well understood. We investigated the clinical features of Providencia bacteremia and the antibiotic susceptibility of Providencia species. We identified cases of Providencia bacteremia from May 2001 to April 2013 at a tertiary care hospital. The medical records of pertinent patients were reviewed. Fourteen cases of Providencia bacteremia occurred; the incidence rate was 0.41 per 10,000 admissions. The median age of the patients was 64.5 years. Eleven cases (78.6%) were nosocomial infections and nine cases (64.3%) were polymicrobial bacteremia. The most common underlying conditions were cerebrovascular/neurologic disease (n = 10) and an indwelling urinary catheter (n = 10, 71.4%). A UTI was the most common source of bacteremia (n = 5, 35.7%). The overall mortality rate was 29% (n = 4); in each case, death occurred within 4 days of the onset of bacteremia. Primary bacteremia was more fatal than other types of bacteremia (mortality rate, 75% [3/4] vs. 10% [1/10], p = 0.041). The underlying disease severity, Acute Physiologic and Chronic Health Evaluation II scores, and Pitt bacteremia scores were significantly higher in nonsurvivors (p = 0.016, p =0.004, and p = 0.002, respectively). Susceptibility to cefepime, imipenem, and piperacillin/tazobactam was noted in 100%, 86%, and 86% of the isolates, respectively. Providencia bacteremia occurred frequently in elderly patients with cerebrovascular or neurologic disease. Although Providencia bacteremia is uncommon, it can be rapidly fatal and polymicrobial. These characteristics suggest that the selection of appropriate antibiotic therapy could be complicated in Providencia bacteremia.
Al Akhrass, Fadi; Al Wohoush, Iba; Chaftari, Anne-Marie; Reitzel, Ruth; Jiang, Ying; Ghannoum, Mahmoud; Tarrand, Jeffrey; Hachem, Ray; Raad, Issam
Rhodococcus is an emerging cause of opportunistic infection in immunocompromised patients, most commonly causing cavitary pneumonia. It has rarely been reported as a cause of isolated bacteremia. However, the relationship between bacteremia and central venous catheter is unknown. Between 2002 and 2010, the characteristics and outcomes of seventeen cancer patients with Rhodococcus bacteremia and indwelling central venous catheters were evaluated. Rhodococcus bacteremias were for the most part (94%) central line-associated bloodstream infection (CLABSI). Most of the bacteremia isolates were Rhodococcus equi (82%). Rhodococcus isolates formed heavy microbial biofilm on the surface of polyurethane catheters, which was reduced completely or partially by antimicrobial lock solution. All CLABSI patients had successful response to catheter removal and antimicrobial therapy. Rhodococcus species should be added to the list of biofilm forming organisms in immunocompromised hosts and most of the Rhodococcus bacteremias in cancer patients are central line associated. PMID:22427914
Flynn, P M; Shenep, J L; Stokes, D C; Barrett, F F
Thirty-one patients with suspected central venous catheter-related bacteremia were evaluated with comparative quantitative cultures of central venous and peripheral blood specimens. Using criteria developed from studies in bacteremic animals, 19 patients were confirmed to have catheter-related bacteremia. Antibiotic therapy was administered through the catheter (in situ therapy) in 17 of those patients to evaluate the feasibility of treating patients with true central venous catheter-related bacteremias without catheter removal. Bacteremia was successfully eradicated in 11 of 17 patients (65%), allowing 7 patients to retain their catheter a median of 157 days. This study validates the use of comparative quantitative blood cultures in the diagnosis of catheter-related bacteremia and indicates that in situ therapy is a rational alternative to catheter removal in patients with catheter-related bacteremia.
de Fernández, M I; Bugarín, G; Arévalo, C E
Achromobacter xylosoxidans is a rare cause of bacteremia, and little information on treatment is available. The majority of patients who have developed Achromobacter bacteremia have presented predisposing causes to the infection. A case of community-acquired pneumonia and bacteremia due to A. xylosoxidans in a previously healthy patient is reported. Achromobacter is usually resistant to ampicillin, cephalosporins (1st, 2nd, and 3rd generation), aminoglycosides, and fluoroquinolones. Piperacillin, piperacillin-tazobactam, and trimethoprim-sulfamethoxazole inhibit most isolates.
Lau, Susanna K. P.; Chow, Wang-Ngai; Foo, Chuen-Hing; Curreem, Shirly O. T.; Lo, George Chi-Shing; Teng, Jade L. L.; Chen, Jonathan H. K.; Ng, Ricky H. Y.; Wu, Alan K. L.; Cheung, Ingrid Y. Y.; Chau, Sandy K. Y.; Lung, David C.; Lee, Rodney A.; Tse, Cindy W. S.; Fung, Kitty S. C.; Que, Tak-Lun; Woo, Patrick C. Y.
Unlike Elizabethkingia meningoseptica, the clinical importance of E. anophelis is poorly understood. We determined the clinical and molecular epidemiology of bacteremia caused by Elizabethkingia-like species from five regional hospitals in Hong Kong. Among 45 episodes of Elizabethkingia-like bacteremia, 21 were caused by Elizabethkingia, including 17 E. anophelis, three E. meningoseptica and one E. miricola; while 24 were caused by other diverse genera/species, as determined by 16S rRNA gene sequencing. Of the 17 cases of E. anophelis bacteremia, 15 (88%) were clinically significant. The most common diagnosis was pneumonia (n = 5), followed by catheter-related bacteremia (n = 4), neonatal meningitis (n = 3), nosocomial bacteremia (n = 2) and neutropenic fever (n = 1). E. anophelis bacteremia was commonly associated with complications and carried 23.5% mortality. In contrast, of the 24 episodes of bacteremia due to non-Elizabethkingia species, 16 (67%) were clinically insignificant. Compared to non-Elizabethkingia bacteremia, Elizabethkingia bacteremia was associated with more clinically significant infections (P < 0.01) and positive cultures from other sites (P < 0.01), less polymicrobial bacteremia (P < 0.01), and higher complication (P < 0.05) and mortality (P < 0.05) rates. Elizabethkingia bacteremia is predominantly caused by E. anophelis instead of E. meningoseptica. Elizabethkingia bacteremia, especially due to E. anophelis, carries significant morbidity and mortality, and should be considered clinically significant unless proven otherwise. PMID:27185741
Kernbauer, Elisabeth; Maurer, Katie; Torres, Victor J.
Mutations that alter virulence and antibiotic susceptibility arise and persist during Staphylococcus aureus bacteremia. However, an experimental system demonstrating transmission following bacteremia has been lacking, and thus implications of within-host adaptation for between-host transmission are unknown. We report that S. aureus disseminates to the gastrointestinal tract of mice following intravenous injection and readily transmits to cohoused naive mice. Both intestinal dissemination and transmission were linked to the production of virulence factors based on gene deletion studies of the sae and agr two-component systems. Furthermore, antimicrobial selection for antibiotic-resistant S. aureus displaced susceptible S. aureus from the intestine of infected hosts, which led to the preferential transmission and dominance of antibiotic-resistant bacteria among cohoused untreated mice. These findings establish an animal model to investigate gastrointestinal dissemination and transmission of S. aureus and suggest that adaptation during the course of systemic infection has implications beyond the level of a single host. PMID:25385792
Uno, Shunsuke; Hase, Ryota; Toguchi, Akihiro; Otsuka, Yoshihito; Hosokawa, Naoto
Listeria monocytogenes is a well-known cause of meningitis, colitis, and bacteremia; however, obstructive pyelonephritis caused by L. monocytogenes has never been reported. We herein report on a 90-year-old Japanese woman with obstructive pyelonephritis and bacteremia due to uterus carcinoma invading the ureter. She was admitted to our hospital complaining of fever and chills, and her physical examination revealed left costovertebral angle tenderness. Computed tomography showed hydronephrosis and complete ureteral obstruction due to tumor invasion. Blood and urine cultures upon nephrostomy revealed the growth of L. monocytogenes. We treated the patient with two weeks of intravenous ampicillin and an additional one-week treatment of oral sulfamethoxazole/trimethoprim. This case shows the importance to recognize L. monocytogenes as a potential causative agent of urinary tract infection.
Park, Jong Eun; Park, So-Young; Song, Dong Joon; Huh, Hee Jae; Ki, Chang-Seok; Peck, Kyong Ran; Lee, Nam Yong
Bacteroides pyogenes, a non-spore-forming, anaerobic, gram-negative rod, is a component of the oral flora of animals and has, on occasion, been reported to cause human infection through dog or cat bites. We report the first case of B. pyogenes bacteremia secondary to liver abscess with no history of an animal bite. The microorganism was identified by 16S rRNA sequencing. Copyright Â© 2016 Elsevier Ltd. All rights reserved.
Khatib, R; Labalo, V; Sharma, M; Johnson, L B; Riederer, K
We retrospectively evaluated adult cases with Enterococcus spp. in 1 blood culture (BC) (1/1/2010-12/31/2015; n=294) and stratified them into bacteremia or contamination. Contamination frequency was similar in community versus hospital-onset, E. faecalis versus E. faecium, and number of BC drawn per day. Contamination predictors were vancomycin-resistance, ampicillin-resistance, commensal organism copresence, and nonurinary/abdominal sources.
Falci, D R; Rigatto, M H; Cantarelli, V V; Zavascki, A P
Lactobacillus rhamnosus is a rare clinical pathogen. A case of bacteremia caused by L. rhamnosus in a kidney transplant recipient is described. Once considered only as a contaminant or a low-virulence organism, L. rhamnosus might be an opportunistic pathogen in immunocompromised patients. To our knowledge, this is the first report of primary bloodstream infection caused by L. rhamnosus in a kidney transplant recipient. © 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.
Egea, Ana L; Vilaró, Mario; De la Fuente, Jorge; Cuestas, Eduardo; Bongiovanni, María E
No clinical events to differentiate bacteteremia from other pathologies in hemodialysis patients therefore the physicians makes diagnosis and treatment decisions based on clinical evidence an local epidemiology. the aim of this work was to study the frequency of microorganism isolated from blood culture of hemodialysis patients with suspected bacteraemia and evaluate Sensitivity (S) and Specificity (E) of medical diagnostic orientation in this cases of suspected Materials and methods: we performed an observational and prospective study for one year in hemodialysis patient with suspected bacteremia. We evaluated blood pressure, temperature (Tº), altered conscious state (AEC), respiratory frequency (FR), chills (ESC),diarrhea (DIARR), blood culture results and microbiological identification. We work with the mean ± standar desviation for continuous variables and frequencies for categorical variables We analyzed S, E, negative predictive value (VPN), positive predictive value (VPP) RESULTADOS: a total of 87 events with suspected bacteremia 34 (39%) were confirmed with positive blood culture the most common microorganisms were cocci Gram positive (CGP) 65%, Most relevant clinical variables were PCP ≥ 2 (VPN 81%), Tº ≥ 38 (VPN 76%) and AEC (E 98% y VPP 80%). CGP were the most prevalent microorganisms None of the clinical variables shows high S and E indicating low usefulness as a predictive tool of bacteremia Excepting AEC with E98% and VPP 80% but it would be necessary to evaluate this variable with a more number patient. Results justify to routine HC use like diagnostic tool.
Behrens-Muller, Brie; Conway, Judith; Yoder, Jonathan; Conover, Craig S
To define the extent of an outbreak of Achromobacter xylosoxidans bacteremia, determine the source of the outbreak, and implement control measures. An outbreak investigation, including environmental and infection control assessment, and evaluation of hypotheses using the binomial distribution and case control studies. A 50-bed medical surgical unit in a hospital in Illinois during the period January 1-July 15, 2006. Discontinuation of use of opioid delivery via patient-controlled analgesia (PCA) until the source of the outbreak was identified and implementation of new protocols to ensure more rigorous observation of PCA pump cartridge manipulations. Calculations based on the binomial distribution indicated the probability that all 9 patients with A. xylosoxidans bacteremia were PCA pump users by chance alone was <.001. A subsequent case control study identified PCA pump use for administration of morphine as a risk factor for A. xylosoxidans bacteremia (odds ratio, undefined; P < .001). Having a PCA pump cartridge with morphine started by nurse C was significantly associated with becoming a case-patient (odds ratio, 46; 95% confidence interval, 4.0-525.0; P < .001). We hypothesize that actions related to diversion of morphine by nurse C were the likely cause of the outbreak. An aggressive pain control program involving the use of opioid medication warrants an equally aggressive policy to prevent diversion of medication by staff.
Barg, N L; Supena, R B; Fekety, R
A patient with methicillin-resistant Staphylococcus aureus bacteremia received vancomycin (MIC = 0.8 microgram/ml, MBC = 15 micrograms/ml) and heparin simultaneously through the same intravenous line to treat a septic deep venous thrombosis. Bacteremia persisted for 7 days. Bacteremia terminated when the simultaneous infusion of heparin and vancomycin through the same line was stopped. This suggested that an interaction between vancomycin and heparin may have occurred, which resulted in a reduction in vancomycin activity. To test for such an interaction, mixtures of heparin and vancomycin in various concentrations were made and tested for antimicrobial activity against the organisms in the patient. A precipitate formed at the concentrations achieved in the intravenous lines, and when the vancomycin concentrations were measured by bioassay, a 50 to 60% reduction in activity was noted. In contrast, when these solutions were prepared and mixed at microgram concentrations, a precipitate was no longer observed, and antimicrobial activity was not reduced. Heparin appeared to interact unfavorably with vancomycin at the concentrations in the intravenous lines when these drugs were administered simultaneously to patients. This may be the cause of poor therapeutic responses to vancomycin in some patients, especially those infected with tolerant organisms.
Kim, Soo-Kyung; Cho, Eun-Jung; Sung, Heungsup; An, Dongheui; Park, Sook-Ja; Nam, Gi-Byoung
Helicobacter cinaedi is an enterohepatic species. It can cause bacteremia, gastroenteritis, and cellulitis, particularly in immunocompromised individuals, such as those with acquired immunodeficiency syndrome, malignancy, or alcoholism. There are no previous reports of H. cinaedi infection in Korea. A 71-yr-old man was admitted to the emergency room because of dyspnea on November 9, 2011. He had undergone splenectomy 3 yr ago because of immune hemolytic anemia. Chest plain radiography revealed bilateral pleural effusion. He developed fever on hospital day (HD) 21. Three sets of blood cultures were taken, and gram-negative spiral bacilli were detected in all aerobic vials. The isolate grew in tiny colonies on chocolate agar after 3-day incubation under microaerophilic conditions. This organism tested positive for catalase and oxidase, and negative for urease. The 16S rRNA gene sequence of this isolate exhibited 99.8% homology with the published sequence of H. cinaedi CCUG 18818T (GenBank accession no. ABQT01000054) and 98.5% homology with the sequence of Helicobacter bilis Hb1T (GenBank accession no. U18766). The patient was empirically treated with piperacillin/tazobactam and levofloxacin, and discharged with improvement on HD 31. To our knowledge, this is the first report of H. cinaedi bacteremia in an asplenic patient. Asplenia appears to be a risk factor for H. cinaedi bacteremia. PMID:23130344
Easter, Sarah Rae; Molina, Rose L; Venkatesh, Kartik K; Kaimal, Anjali; Tuomala, Ruth; Riley, Laura E
To evaluate risk factors associated with maternal bacteremia in febrile peripartum women. We performed a case-control study of women with fevers occurring between 7 days before and up to 42 days after delivery of viable neonates at two academic hospitals. Women with positive blood cultures were matched with the next two febrile women meeting inclusion criteria with negative blood cultures in the microbiology data without other matching parameters. We compared maternal and neonatal characteristics and outcomes between women in the case group and those in the control group with univariate analysis. We then used logistic regression to examine the association between clinical characteristics and maternal bacteremia. After excluding blood cultures positive only for contaminants, we compared 115 women in the case group with 285 in the control group. Bacteremic women were more likely to experience their initial fever during labor (40.9% compared with 22.8%, P<.01) and more likely to have fever at or above 102°F (62.6% compared with 31.6%, P<.01). These associations persisted in the adjusted analysis: multiparity (adjusted odds ratio [OR] 1.75, 95% CI 1.07-2.87), initial fever during labor (adjusted OR 2.82, 95% CI 1.70-4.70), and fever at or above 102°F (adjusted OR 3.83, 95% CI 2.37-6.19). In an analysis restricted to neonates whose mothers had initial fevers before or in the immediate 24 hours after delivery, neonates born to women in the case group had higher rates of bacteremia compared with those born to women in the control group (9.0% compared with 1.3%, P<.01). Eight of the nine bacteremic neonates born to bacteremic mothers (89%) grew the same organism as his or her mother in blood culture. Maternal bacteremia is associated with multiparity, initial fever during labor, and fever at or above 102°F; however, 37.5% of cases of bacteremia occurred in women with maximum fevers below this threshold. Obstetricians should maintain a heightened suspicion for an
Cobo, Fernando; Cabezas-Fernández, Maria Teresa; Cabeza-Barrera, Maria Isabel
Streptococcus pneumoniae remains an important cause of bacteremia worldwide. Last years, a decrease of S. pneumoniae penicillin-resistant isolates has been observed. The objective of this study was to describe the episodes of bacteremia due to S. pneumoniae during a period of 11 years. Epidemiological and clinical data, serotypes causing bacteremia, antibiotic susceptibility and prognosis factors were studied. Over a period of 11 years, all the episodes of S. pneumoniae bacteremia were analysed. Their clinical and microbiological features were recorded. Statistical analysis was carried out to determine risk factors for pneumococcal bacteremia and predictors of fatal outcome. Finally, 67 S. pneumoniae bacteremia episodes were included in this study. The majority of cases were produced in white men in the middle age of their life. The main predisposing factors observed were smoking, antimicrobial and/or corticosteroids administration, chronic pulmonary obstructive disease and HIV infection, and the most common source of bacteremia was the low respiratory tract. The main serotypes found were 19A, 1, 14 and 7F. Seventy-seven percent of these isolates were penicillin-susceptible, and the mortality in this serie was really low. Statistical significance was observed between age, sex and race factors and the presence of bacteremia, and there was relationship between the patient's condition and the outcome. In our study, S. pneumoniae bacteremia is mainly from community-acquired origin mainly caused in men in the median age of the life. 40% of bacteremias were caused by serotypes 19A, 1, 7F and 14. During the period of study the incidence of bacteremia was stable and the mortality rate was very low. PMID:24470943
Ha, Young Eun; Song, Jae-Hoon; Kang, Won Ki; Peck, Kyong Ran; Chung, Doo Ryeon; Kang, Cheol-In; Joung, Mi-Kyong; Joo, Eun-Jeong; Shon, Kyung Mok
Bacteremia is an important clinical condition in febrile neutropenia that can cause clinical failure of antimicrobial therapy. The purpose of this study was to investigate the clinical factors predictive of bacteremia in low-risk febrile neutropenia at initial patient evaluation. We performed a retrospective cohort study in a university hospital in Seoul, Korea, between May 1995 and May 2007. Patients who met the criteria of low-risk febrile neutropenia at the time of visit to emergency department after anti-cancer chemotherapy were included in the analysis. During the study period, 102 episodes of bacteremia were documented among the 993 episodes of low-risk febrile neutropenia. Single gram-negative bacteremia was most frequent. In multivariate regression analysis, initial body temperature ≥39°C, initial hypotension, presence of clinical sites of infection, presence of central venous catheter, initial absolute neutrophil count <50/mm(3), and the CRP ≥10 mg/dL were statistically significant predictors for bacteremia. A scoring system using these variables was derived and the likelihood of bacteremia was well correlated with the score points with AUC under ROC curve of 0.785. Patients with low score points had low rate of bacteremia, thus, would be candidates for outpatient-based or oral antibiotic therapy. We identified major clinical factors that can predict bacteremia in low-risk febrile neutropenia.
Schaefer, Gabrielle; Campbell, Wesley; Jenks, Jeffrey; Beesley, Cari; Katsivas, Theodoros; Hoffmaster, Alex; Mehta, Sanjay R; Reed, Sharon
Bacillus cereus is typically considered a blood culture contaminant; however, its presence in blood cultures can indicate true bacteremia. We report 4 episodes of B. cereus bacteremia in 3 persons who inject drugs. Multilocus sequence typing showed that the temporally associated infections were caused by unrelated clones.
Shapiro, C L; Haft, R F; Gantz, N M; Doern, G V; Christenson, J C; O'Brien, R; Overall, J C; Brown, B A; Wallace, R J
Tsukamurella paurometabolum is a weakly acid-fast, pleomorphic gram-positive bacterium found in soil. Human infection due to this organism has rarely been described, and there are no published accounts of bacteremia. Three cases of bacteremia due to T. paurometabolum and related to long-term use of a central venous catheter in patients with cancer who were receiving chemotherapy are described.
Schaefer, Gabrielle; Campbell, Wesley; Jenks, Jeffrey; Beesley, Cari; Katsivas, Theodoros; Hoffmaster, Alex; Mehta, Sanjay R.
Bacillus cereus is typically considered a blood culture contaminant; however, its presence in blood cultures can indicate true bacteremia. We report 4 episodes of B. cereus bacteremia in 3 persons who inject drugs. Multilocus sequence typing showed that the temporally associated infections were caused by unrelated clones. PMID:27533890
Gauguet, Stefanie; Ahmed, Asim A; Zhou, Jing; Pfoh, Elizabeth R; Ahnger-Pier, Kathryn K; Harper, Marvin B; Ozonoff, Al; Wessels, Michael R; Lee, Grace M
We analyzed characteristics of 86 Group A streptococcal bacteremia cases at Boston Children's Hospital from 1992 to 2012. Twenty-three percent of children had severe disease, using intensive care unit admission (18), disability (7) or death (2) as indicators. Children with bacteremia without a source (30% of cases) were less likely to have severe disease than children with focal infections in adjusted models.
Sreenivasan, Prem K; Tischio-Bereski, Deborah; Fine, Daniel H
The aims of this study were to; 1) test susceptibility to bacteremia in subjects with moderate gingivitis, and 2) compare the effects of brushing with a fluoride toothpaste (control) as compared to a triclosan/copolymer toothpaste (test) on those susceptible to repeated bacteremia. One hundred and seven adult subjects were tested for repeated bacteremia after eating a hard apple. Twenty-nine bacteremia positive subjects were enrolled in a double-blind cross-over study designed to analyse the effects of a test toothpaste. After random toothpaste assignment, subjects brushed for 21 days. Following a wash-out period, subjects completed the study with the alternate toothpaste. Statistical analysis compared bacteremia between groups by analysis of covariance (ANCOVA). Twenty-six adult subjects completed the cross-over study. No statistically significant differences for bacteremia were seen at baseline. Mean bacterial counts at baseline and post-treatment visits were 45.5 and 10.8 counts versus 48.5 and 38.0 counts, respectively (test vs. control group; significant at p < .05). Significant reductions in blood borne bacteria were seen in the test versus control groups in both cultural and DNA data (p < .05). Thirty percentage of subjects showed repeated bacteremia. Brushing with a triclosan/copolymer dentifrice demonstrated significant reductions in bacteremia as compared to the control toothpaste. © 2017 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.
Tugcu, Deniz; Turel, Ozden; Aydogan, Gonul; Akcay, Arzu; Salcioglu, Zafer; Akici, Ferhan; Sen, Hulya; Demirkaya, Metin; Taskin, Necati; Gurler, Nezahat
Achromobacter xylosoxidans is an aerobic gram-negative bacillus and important cause of bacteremia in immunocompromised patients. We describe a leukemia pediatric patient with severe neutropenia who developed bacteremia with A xylosoxidans resistant to multiple antibiotics, and treated the patient with tigecycline and piperacillin-tazobactam in addition to supportive medications.
Yoo, Jin-Hong; Lee, Dong-Gun; Choi, Su Mi; Choi, Jung-Hyun; Shin, Wan-Shik; Kim, Myungshin; Yong, Dongeun; Lee, Kyungwon; Min, Woo-Sung; Kim, Chun-Choo
An increase in vancomycin-resistant enterococcal (VRE) bacteremia in hemato-oncological patients (n=19) in our institution from 2000 through 2001 led us to analyze the molecular epidemiologic patterns and clinical features unique to our cases. The pulsed field gel electrophoresis of the isolates revealed that the bacteremia was not originated from a single clone but rather showed endemic pattern of diverse clones with small clusters. A different DNA pattern of blood and stool isolates from one patient suggested exogenous rather than endogenous route of infection. Enterococcus faecium carrying vanA gene was the causative pathogen in all cases. Patients with VRE bacteremia showed similar clinical courses compared with those with vancomycin-susceptible enterococcal (VSE) bacteremia. Vancomycin resistance did not seem to be a poor prognostic factor because of similar mortality (5/8, 62.5%) noted in VSE bacteremia. Initial disease severity and neutropenic status may be major determinants of prognosis in patients with VRE bacteraemia.
Yoon, Young Kyung; Kim, Hyun Ah; Ryu, Seong Yeol; Lee, Eun Jung; Lee, Mi Suk; Kim, Jieun; Park, Seong Yeon; Yang, Kyung Sook; Kim, Shin Woo
This study aimed to construct a prediction algorithm, which is readily applicable in the clinical setting, to determine the mortality rate for patients with P. aeruginosa bacteremia. A multicenter observational cohort study was performed retrospectively in seven university-affiliated hospitals in Korea from March 2012 to February 2015. In total, 264 adult patients with monomicrobial P. aeruginosa bacteremia were included in the analyses. Among the predictors independently associated with 30-day mortality in the Cox regression model, Pitt bacteremia score >2 and high-risk source of bacteremia were identified as critical nodes in the tree-structured survival analysis. Particularly, the empirical combination therapy was not associated with any survival benefit in the Cox regression model compared to the empirical monotherapy. This study suggests that determining the infection source and evaluating the clinical severity are critical to predict the clinical outcome in patients with P. aeruginosa bacteremia.
Rosenman, J.E.; Pearce, W.H.; Kempczinski, R.F.
All currently used arterial prosthetics have a greater susceptibility to infection following bacteremia than does autogenous tissue. This experiment compares quantitative bacterial adherence to various prosthetic materials after bacteremia carried out in a tightly controlled and quantitative fashion. Ten centimeters long, 4 mm i.d. Dacron, umbilical vein (HUV), and polytetrafluoroethylene (PTFE) grafts, as well as PTFE grafts with a running suture line at the midportion were tested. Each graft was interposed into a pulsatile perfusion system modified from a Waters MOX 100 TM renal transplant pump. Indium-111-labeled Staphylococcus aureus were added to heparinized canine blood to give a mean concentration of 4.7 X 10(6) bacteria/cc. This infected blood was recirculated through each graft for 30 min at a rate of 125 cc/m, 100 Torr (sys), 60 beats/min. The gamma counts/graft were used to calculate the number of bacteria/cm2 of graft surface. After nine experiments, a mean of 9.63 X 10(5) bacteria/cm2 were adherent to the Dacron, 1.04 X 10(5) bacteria/cm2 to the HUV, and 2.15 X 10(4) bacteria/cm2 to the PTFE. These differences were all significant at the 0.05 level. The addition of a suture line increased bacterial adherence to the PTFE graft by 50%. These results suggest that PTFE is the vascular graft material of choice when a prosthetic graft must be implanted despite a high risk of subsequent clinical bacteremia. An in vitro, pulsatile perfusion model gave accurate and reproducible results, and appears well suited for further studies of bacterial, or platelet adherence to grafts, as well as the biomechanics of vascular conduits.
Lee, Yangsoon; Park, Yongjung; Kim, Myungsook; Choi, Jun Yong; Yong, Dongeun; Jeong, Seok Hoon
Background Investigation on incidence and mortality of anaerobic bacteremia (AB) is clinically relevant in spite of its infrequent occurrence and not often explored, which report varies according to period and institutions. Therefore, it is necessary to analyze the incidence and risk factors related to mortality and assess clinical outcomes of AB in current aspect. Materials and Methods Characteristics of AB patients and anaerobic bacteria from blood culture at a university hospital in 2012 were reviewed retrospectively. The correlation between risk factors and 28-day patient mortality was analyzed. Results A total of 70 non-duplicated anaerobic bacteria were isolated from blood of 70 bacteremia patients in 2012. The history of cardiovascular disease as host's risk factor was statistically significant (P = 0.0344) in univariate and multivariate analysis. Although the inappropriate therapy was not statistically significant in univariate and multivariate analysis, the survival rate of bacteremia was significantly worse in patients who had inappropriate therapy compared with those underwent appropriate therapy (hazard ratio, 5.4; 95% confidence interval, 1.7–6.9; P = 0.004). The most frequently isolated organism was Bacteroides fragilis (32 isolates, 46%), followed by Bacteroides thetaiotaomicron (10, 14%), and non-perfringens Clostridium (7, 10%). Conclusion The incidence of AB in 2012 was 2.3% (number of AB patients per 100 positive blood culture patients) and the mortality rate in patients with clinically significant AB was 21.4%. In addition, AB was frequently noted in patients having malignancy and the survival rate of AB was significantly worse in patients who received inappropriate therapy compared with those underwent appropriate therapy. PMID:27433379
Schuppener, Leah M; Pop-Vicas, Aurora E; Brooks, Erin G; Duster, Megan N; Crnich, Christopher J; Sterkel, Alana K; Webb, Aaron P; Safdar, Nasia
OBJECTIVE To describe the investigation and control of a cluster of Serratia marcescens bacteremia in a 505-bed tertiary-care center. METHODS Cluster cases were defined as all patients with S. marcescens bacteremia between March 2 and April 7, 2014, who were found to have identical or related blood isolates determined by molecular typing with pulsed-field gel electrophoresis. Cases were compared using bivariate analysis with controls admitted at the same time and to the same service as the cases, in a 4:1 ratio. RESULTS In total, 6 patients developed S. marcescens bacteremia within 48 hours after admission within the above period. Of these, 5 patients had identical Serratia isolates determined by molecular typing, and were included in a case-control study. Exposure to the post-anesthesia care unit was a risk factor identified in bivariate analysis. Evidence of tampered opioid-containing syringes on several hospital units was discovered soon after the initial cluster case presented, and a full narcotic diversion investigation was conducted. A nurse working in the post-anesthesia care unit was identified as the employee responsible for the drug diversion and was epidemiologically linked to all 5 patients in the cluster. No further cases were identified once the implicated employee's job was terminated. CONCLUSION Illicit drug use by healthcare workers remains an important mechanism for the development of bloodstream infections in hospitalized patients. Active mechanisms and systems should remain in place to prevent, detect, and control narcotic drug diversions and associated patient harm in the healthcare setting. Infect Control Hosp Epidemiol 2017;38:1027-1031.
Jung, Dong Sik
Background To elucidate the clinical presentation, antimicrobial susceptibility, and prognostic factors of monomicrobial Aeromonas bacteremia in order to determine the most effective optimal therapy. Materials and Methods We reviewed the medical records of Aeromonas bacteremia patients for the period January 2000 to December 2013 in a retrospective multi-center study. Results A total of 336 patient records were reviewed, with 242 having community-acquired bacteremia. The major clinical infections were of the hepatobiliary tract (50.6%) and peritonitis (18.5%), followed by primary bacteremia (17.9%). The infections usually occurred in patients with malignancy (42.3%), hepatic cirrhosis (39.3%), or diabetes mellitus (25.6%). High antimicrobial-resistance rates (15.5% for ceftriaxone, 15.5% for piperacillin/tazobactam) were noted. However, resistance to carbapenem and amikacin was only 9.8% and 3.0%, respectively. Aeromonas hydrophila (58.9%) was the most common pathogen, followed by Aeromonas caviae (30.4%). The severity of A. caviae bacteremia cases were less than that of A. hydrophila or Aeromonas veronii bacteremia (P <0.05). A. hydrophila showed higher antimicrobial resistance than did other Aeromonas species (P <0.05). Patients with hospital-acquired bacteremia were more likely to have severely abnormal laboratory findings and relatively high antimicrobial-resistance rates. Mortality was associated with metastatic cancer, shock, delayed use of appropriate antimicrobial agents, increased prothrombin time, and increased creatinine level (P <0.05). Conclusions Aeromonas species should be considered one of the causative agents of bacteremia in patients with intra-abdominal infections or malignancies. Although ceftriaxone-resistant Aeromonas bacteremia was not statistically related to mortality in this study, it was associated with severe clinical manifestations and laboratory abnormalities. Appropriate antibiotics, including carbapenem, should be administered early
Komatsu, Takayuki; Takahashi, Erika; Mishima, Kentaro; Toyoda, Takeo; Saitoh, Fumihiro; Yasuda, Akari; Matsuoka, Joe; Sugita, Manabu; Branch, Joel; Aoki, Makoto; Tierney, Lawrence; Inoue, Kenji
Predicting the presence of true bacteremia based on clinical examination is unreliable. We aimed to construct a simple algorithm for predicting true bacteremia by using food consumption and shaking chills. A prospective multicenter observational study. Three hospital centers in a large Japanese city. In total, 1,943 hospitalized patients aged 14 to 96 years who underwent blood culture acquisitions between April 2013 and August 2014 were enrolled. Patients with anorexia-inducing conditions were excluded. We assessed the patients' oral food intake based on the meal immediately prior to the blood culture with definition as "normal food consumption" when >80% of a meal was consumed and "poor food consumption" when <80% was consumed. We also concurrently evaluated for a history of shaking chills. We calculated the statistical characteristics of food consumption and shaking chills for the presence of true bacteremia, and subsequently built the algorithm by using recursive partitioning analysis. Among 1,943 patients, 223 cases were true bacteremia. Among patients with normal food consumption, without shaking chills, the incidence of true bacteremia was 2.4% (13/552). Among patients with poor food consumption and shaking chills, the incidence of true bacteremia was 47.7% (51/107). The presence of poor food consumption had a sensitivity of 93.7% (95% confidence interval [CI], 89.4%-97.9%) for true bacteremia, and the absence of poor food consumption (ie, normal food consumption) had a negative likelihood ratio (LR) of 0.18 (95% CI, 0.17-0.19) for excluding true bacteremia, respectively. Conversely, the presence of the shaking chills had a specificity of 95.1% (95% CI, 90.7%-99.4%) and a positive LR of 4.78 (95% CI, 4.56-5.00) for true bacteremia. A 2-item screening checklist for food consumption and shaking chills had excellent statistical properties as a brief screening instrument for predicting true bacteremia.
Chen, Chung-Hua; Lin, Jesun; Lin, Jen-Shiou; Chen, Yu-Min
We present the case of a 49-year-old man, who developed Mycobacterium abscessus complex (M. abscessus complex) bacteremia and prostatitis after prostate biopsy. The patient was successfully treated with amikacin with imipenem-cilastatin with clarithromycin. Infections caused by M. abscessus complex have been increasingly described as a complication associated with many invasive procedures. Invasive procedures might have contributed to the occurrence of the M. abscessus complex. Although M. abscessus complex infection is difficult to diagnose and treat, we should pay more attention to this kind of infection, and the correct treatment strategy will be achieved by physicians.
Importance. Infections can cause leukocytoclastic vasculitis. Observations. We report the case of a patient with a left ventricular assist device who presented with acute kidney injury and biopsy proven leukocytoclastic vasculitis. Blood cultures grew Listeria monocytogenes. The patient's rash improved with treatment of the underlying Listeria infection. Conclusion. Clinicians should be aware that there are a number of broad categories of disease associated with the histologic finding of vasculitis, including infection. It is important to keep in mind the risk factors of a particular patient when formulating a differential diagnosis. This is the first reported case of Listeria bacteremia causing leukocytoclastic vasculitis. PMID:27313916
Joseph, Noyal Mariya; Harish, Belgode Narasimha; Sistla, Sujatha; Thappa, Devinder Mohan; Parija, Subhash Chandra
A 29-year-old woman presented with multiple painful swelling with discharging sinuses over the scalp. Histopathological examination of the biopsy tissue was suggestive of actinomycotic mycetoma. Streptomyces spp. was isolated from blood culture. The patient was successfully treated with trimethoprim-sulfamethoxazole and crystalline penicillin. This case is reported because of the rare occurrence of bacteremia by Streptomyces spp. secondary to subcutaneous actinomycotic mycetoma. Moreover, an interesting association between successive two pregnancies and occurrence of mycetoma of the scalp was observed in this case.
Harmon, Nicole; Mortensen, Joel E; Robinette, Eric; Powell, Eleanor A
We present a case of pediatric bacteremia caused by Chromobacterium haemolyticum, a β-hemolytic, non-pigmented, Gram-negative bacilli recovered from a blood culture and initially identified as Chromobacterium violaceum using phenotypic and proteomic methods. 16S rRNA sequencing of the patient isolated demonstrated a high degree of sequence homology with the type strain of C. haemolyticum. The patient recovered following treatment with meropenem, gentamicin, and trimethoprim/sulfamethoxazole. This case highlights the potential misidentification of C. haemolyticum as non-pigmented C. violaceum due to limitations of the currently available identification methodologies.
Bhuyan, U. N.; Ramalingaswami, V.
Staphylococcal bacteremia was induced in two groups of rabbits that were pairfed high protein and protein deficient diets. Marked deviations in response were observed as a result of protein deficiency: a) blood clearance of S aureus was delayed; b) persistence and multiplication of bacteria in blood and tissues were pronounced; c) neutrophilic response was poor and transitory; d) mortality was very high and occurred very early and e) focal necrotizing lesions, rather than well-formed abscesses, were found in organs. ImagesFig 1Fig 2Fig 3Fig 4 PMID:4634740
Shim, Hyoeun Eun; Sung, Heungsup; Baek, Seung Mi; Namgung, Seung; Kim, Mi-Na; Kim, Yong Gyun; Lee, Gyu Hyung
Tsukamurella pulmonis is an aerobic actinomycete. We report a catheter-related bacteremia of T. pulmonis. A 39 yr-old male with ALL was hospitalized to receive bone marrow transplantation (BMT). Although the patient developed a high fever at the 7th hospital day (HD), it subsided with vancomycin treatment, and he received BMT at 9th HD. Fever resurged at 16th HD despite sustained treatment with vancomycin, meropenem, and amphotericin B, but subsided with removal of Hickman catheter (HC) at 19th HD. Three sets of blood cultures comprising one from the HC and two from venipunctures were taken at 7th, 16th, and 19th HD, and the distal tip of the HC was also cultured. The aerobic vials of all 3 HC-withdrawn blood cultures and one peripheral blood culture taken at 19HD and the HC tip culture grew long, straight, thin gram-positive rods that were positive on modified Kinyoun stain. This organism showed tiny, rough, grey colonies after 3-day incubation and grew to large flat colonies when incubation was extended. It was catalase-positive, urease-positive, and alkaline-slant/alkaline-deep on triple sugar iron agar, and hydrolyzed hypoxanthine. The sequence of 1,296 base pairs of 16S rRNA of this organism showed a 100.0% homology with the published sequence of T. pulmonis DSM 44142T. To our knowledge, this is the first report of T. pulmonis bacteremia in Korea.
Kernbauer, Elisabeth; Maurer, Katie; Torres, Victor J; Shopsin, Bo; Cadwell, Ken
Mutations that alter virulence and antibiotic susceptibility arise and persist during Staphylococcus aureus bacteremia. However, an experimental system demonstrating transmission following bacteremia has been lacking, and thus implications of within-host adaptation for between-host transmission are unknown. We report that S. aureus disseminates to the gastrointestinal tract of mice following intravenous injection and readily transmits to cohoused naive mice. Both intestinal dissemination and transmission were linked to the production of virulence factors based on gene deletion studies of the sae and agr two-component systems. Furthermore, antimicrobial selection for antibiotic-resistant S. aureus displaced susceptible S. aureus from the intestine of infected hosts, which led to the preferential transmission and dominance of antibiotic-resistant bacteria among cohoused untreated mice. These findings establish an animal model to investigate gastrointestinal dissemination and transmission of S. aureus and suggest that adaptation during the course of systemic infection has implications beyond the level of a single host. Copyright © 2015, American Society for Microbiology. All Rights Reserved.
Pavlinac, Patricia B.; Naulikha, Jaqueline M.; John-Stewart, Grace C.; Onchiri, Frankline M.; Okumu, Albert O.; Sitati, Ruth R.; Cranmer, Lisa M.; Lokken, Erica M.; Singa, Benson O.; Walson, Judd L.
In children, Mycobacterium tuberculosis (M. tuberculosis) frequently disseminates systemically, presenting with nonspecific signs including fever. We determined prevalence of M. tuberculosis bacteremia among febrile children presenting to hospitals in Nyanza, Kenya (a region with high human immunodeficiency virus (HIV) and M. tuberculosis prevalence). Between March 2013 and February 2014, we enrolled children aged 6 months to 5 years presenting with fever (axillary temperature ≥ 37.5°C) and no recent antibiotic use. Blood samples were collected for bacterial and mycobacterial culture using standard methods. Among 148 children enrolled, median age was 3.1 years (interquartile range: 1.8–4.1 years); 10.3% of children were living with a household member diagnosed with M. tuberculosis in the last year. Seventeen percent of children were stunted (height-for-age z-score < −2), 18.6% wasted (weight-for-height z-score < −2), 2.7% were HIV-infected, and 14.2% were HIV-exposed uninfected. Seventeen children (11.5%) had one or more signs of tuberculosis (TB). All children had a Bacille Calmette-Guerin vaccination scar. Among 134 viable blood cultures, none (95% confidence interval: 0–2.7%) had Mycobacterium isolated. Despite exposure to household TB contacts, HIV exposure, and malnutrition, M. tuberculosis bacteremia was not detected in this pediatric febrile cohort, a finding consistent with other pediatric studies. PMID:26324730
Pavlinac, Patricia B; Naulikha, Jaqueline M; John-Stewart, Grace C; Onchiri, Frankline M; Okumu, Albert O; Sitati, Ruth R; Cranmer, Lisa M; Lokken, Erica M; Singa, Benson O; Walson, Judd L
In children, Mycobacterium tuberculosis (M. tuberculosis) frequently disseminates systemically, presenting with nonspecific signs including fever. We determined prevalence of M. tuberculosis bacteremia among febrile children presenting to hospitals in Nyanza, Kenya (a region with high human immunodeficiency virus (HIV) and M. tuberculosis prevalence). Between March 2013 and February 2014, we enrolled children aged 6 months to 5 years presenting with fever (axillary temperature ≥ 37.5°C) and no recent antibiotic use. Blood samples were collected for bacterial and mycobacterial culture using standard methods. Among 148 children enrolled, median age was 3.1 years (interquartile range: 1.8-4.1 years); 10.3% of children were living with a household member diagnosed with M. tuberculosis in the last year. Seventeen percent of children were stunted (height-for-age z-score < -2), 18.6% wasted (weight-for-height z-score < -2), 2.7% were HIV-infected, and 14.2% were HIV-exposed uninfected. Seventeen children (11.5%) had one or more signs of tuberculosis (TB). All children had a Bacille Calmette-Guerin vaccination scar. Among 134 viable blood cultures, none (95% confidence interval: 0-2.7%) had Mycobacterium isolated. Despite exposure to household TB contacts, HIV exposure, and malnutrition, M. tuberculosis bacteremia was not detected in this pediatric febrile cohort, a finding consistent with other pediatric studies.
Chen, Hui-Lan; Lu, Jen-Her; Wang, Hsin-Hui; Chen, Shu-Jen; Chen, Chun-Jen; Wu, Keh-Gong; Tang, Ren-Bin
Enterobacter species has emerged as an important pathogen of nosocomial bacteremia. The purpose of this study is to review the clinical characteristics of bacteremia in pediatric patients. We reviewed retrospectively the medical records of patients (under the age of 18 years) having Enterobacter bacteremia who were treated at Taipei the Veterans General Hospital from January 2001 to June 2011. In total, 853 positive blood cultures were obtained from 620 patients during the study period. Among them, 96 episodes of Enterobacter bacteremia were found in 83 patients, accounting for 11.3% of all bacteremia. Eighty-two cases (98.8%) were nosocomial infections. Most of the cases were neonates (62 cases, 74.7%) and premature infants (51 cases, 61.5%). The common sources of bacteremia were the respiratory tract (53.0%), followed by intravascular catheter (10.8%), multiple sources (10.8%), and the gastrointestinal tract (8.4%). The overall case fatality rate was 18.1%, with the highest rate being reported among premature infants. The factors responsible for the deaths were leukocytosis and a higher median number of underlying diseases. Based on the findings of the present study, it can be concluded that Enterobacter species are probably an important pathogen of nosocomial bacteremia in premature neonates. The number of underlying diseases should be considered a major factor influencing the prognosis. Copyright © 2013. Published by Elsevier B.V.
Obaro, Stephen K.; Hassan-Hanga, Fatimah; Olateju, Eyinade K.; Umoru, Dominic; Lawson, Lovett; Olanipekun, Grace; Ibrahim, Sadeeq; Munir, Huda; Ihesiolor, Gabriel; Maduekwe, Augustine; Ohiaeri, Chinatu; Adetola, Anthony; Shetima, Denis; Jibir, Binta W.; Nakaura, Hafsat; Kocmich, Nicholas; Ajose, Therasa; Idiong, David; Masokano, Kabir; Ifabiyi, Adeyemi; Ihebuzor, Nnenna; Chen, Baojiang; Meza, Jane; Akindele, Adebayo; Rezac-Elgohary, Amy; Olaosebikan, Rasaq; Suwaid, Salman; Gambo, Mahmoud; Alter, Roxanne; Davies, Herbert D.; Fey, Paul D.
Background. Etiologic agents of childhood bacteremia remain poorly defined in Nigeria. The absence of such data promotes indiscriminate use of antibiotics and delays implementation of appropriate preventive strategies. Methods. We established diagnostic laboratories for bacteremia surveillance at regional sites in central and northwest Nigeria. Acutely ill children aged <5 years with clinically suspected bacteremia were evaluated at rural and urban clinical facilities in the Federal Capital Territory, central region and in Kano, northwest Nigeria. Blood was cultured using the automated Bactec incubator system. Results. Between September 2008 and April 2015, we screened 10 133 children. Clinically significant bacteremia was detected in 609 of 4051 (15%) in the northwest and 457 of 6082 (7.5%) in the central region. Across both regions, Salmonella species account for 24%–59.8% of bacteremias and are the commonest cause of childhood bacteremia, with a predominance of Salmonella enterica serovar Typhi. The prevalence of resistance to ampicillin, chloramphenicol, and cotrimoxazole was 38.11%, with regional differences in susceptibility to different antibiotics but high prevalence of resistance to readily available oral antibiotics. Conclusions. Salmonella Typhi is the leading cause of childhood bacteremia in central Nigeria. Expanded surveillance is planned to define the dynamics of transmission. The high prevalence of multidrug-resistant strains calls for improvement in environmental sanitation in the long term and vaccination in the short term. PMID:26449948
Obaro, Stephen K; Hassan-Hanga, Fatimah; Olateju, Eyinade K; Umoru, Dominic; Lawson, Lovett; Olanipekun, Grace; Ibrahim, Sadeeq; Munir, Huda; Ihesiolor, Gabriel; Maduekwe, Augustine; Ohiaeri, Chinatu; Adetola, Anthony; Shetima, Denis; Jibir, Binta W; Nakaura, Hafsat; Kocmich, Nicholas; Ajose, Therasa; Idiong, David; Masokano, Kabir; Ifabiyi, Adeyemi; Ihebuzor, Nnenna; Chen, Baojiang; Meza, Jane; Akindele, Adebayo; Rezac-Elgohary, Amy; Olaosebikan, Rasaq; Suwaid, Salman; Gambo, Mahmoud; Alter, Roxanne; Davies, Herbert D; Fey, Paul D
Etiologic agents of childhood bacteremia remain poorly defined in Nigeria. The absence of such data promotes indiscriminate use of antibiotics and delays implementation of appropriate preventive strategies. We established diagnostic laboratories for bacteremia surveillance at regional sites in central and northwest Nigeria. Acutely ill children aged <5 years with clinically suspected bacteremia were evaluated at rural and urban clinical facilities in the Federal Capital Territory, central region and in Kano, northwest Nigeria. Blood was cultured using the automated Bactec incubator system. Between September 2008 and April 2015, we screened 10,133 children. Clinically significant bacteremia was detected in 609 of 4051 (15%) in the northwest and 457 of 6082 (7.5%) in the central region. Across both regions, Salmonella species account for 24%-59.8% of bacteremias and are the commonest cause of childhood bacteremia, with a predominance of Salmonella enterica serovar Typhi. The prevalence of resistance to ampicillin, chloramphenicol, and cotrimoxazole was 38.11%, with regional differences in susceptibility to different antibiotics but high prevalence of resistance to readily available oral antibiotics. Salmonella Typhi is the leading cause of childhood bacteremia in central Nigeria. Expanded surveillance is planned to define the dynamics of transmission. The high prevalence of multidrug-resistant strains calls for improvement in environmental sanitation in the long term and vaccination in the short term. © The Author 2015. Published by Oxford University Press on behalf of the Infectious Diseases Society of America. All rights reserved. For Permissions, please e-mail: firstname.lastname@example.org.
Rudman, D; Hontanosas, A; Cohen, Z; Mattson, D E
Little is known about bacteremia in long-term care facilities. We have conducted a retrospective study during a 12-month period analyzing the clinical correlates of bacteremia in 533 chronically institutionalized, predominantly male patients, with an average age of 69 years. Thirty-four men had forty-two bacteremic illnesses during this period. The incidence rate was 0.30 episodes per 1000 patient care days, and the mortality rate was 21%. The urinary tract was the most frequently identified tissue source (56%), followed by respiratory tract (7%) and skin (7%). Providencia stuartii was the most common gram-negative organism, while Staphylococcus aureus, Streptococcus pneumoniae and enterococcus were the frequent gram-positive microbes. Gram-negative bacteremia accounted for 63% of the episodes (15% mortality rate), and gram-positive bacteremia accounted for 27% (18% mortality rate); 10% of the bacteremias were polymicrobial (25% mortality rate). Most of the isolated organisms were sensitive to available antimicrobial agents. The leading risk factor for bacteremia was an indwelling urinary catheter (odds ratio 39, 95% confidence limits 16 to 97). Patients with urinary catheters at the beginning of the study constituted only 5% of the population, but accounted for 40% of the gram-negative bacteremias during the year of observation.
Martin, Camilia R.; Dammann, Olaf; Allred, Elizabeth N.; Patel, Sonal; O’Shea, T. Michael; Kuban, Karl C. K.; Leviton, Alan
Objective To evaluate neurodevelopment following necrotizing enterocolitis (NEC) and late bacteremia, alone and together. Study design Sample included 1155 infants born at 23-27 weeks’ gestation. NEC was classified by the Modified Bell’s staging criteria and grouped as medical NEC or surgical NEC. Late bacteremia was defined as a positive blood culture after the first postnatal week. Neurodevelopment was assessed at 24 months corrected age. Multivariable models estimated the risk of developmental dysfunction and microcephaly associated with medical or surgical NEC with and without late bacteremia. Results Children who had surgical NEC unaccompanied by late bacteremia were at increased risk of Psychomotor Developmental Indices <70 [OR=2.7 (1.2, 6.4)], and children who had both surgical NEC and late bacteremia were at increased risk of diparetic cerebral palsy [OR=8.4 (1.9, 39)] and microcephaly [OR=9.3 (2.2, 40)]. In contrast, children who had medical NEC with or without late bacteremia were not at increased risk of any developmental dysfunction. Conclusion The risk of neurodevelopmental dysfunction and microcephaly is increased in children who had surgical NEC, especially if they also had late bacteremia. These observations support the hypothesis that bowel injury might initiate systemic inflammation potentially affecting the developing brain. PMID:20598317
Conway, Laurie J.; Liu, Jianfang; Harris, Anthony D.; Larson, Elaine L.
Background Catheter-associated bacteriuria is complicated by secondary bacteremia in 0.4% to 4.0% of cases. The directly attributable mortality rate is 12.7% Objective To identify risk factors for bacteremia associated with catheter-associated bacteriuria. Methods Data were acquired from a large electronic clinical and administrative database of consecutive adult inpatient admissions to 2 acute care hospitals during a 7-year period. Data on patients with catheter-associated bacteriuria and bacteremia were compared with data on control patients with catheter-associated bacteriuria and no bacteremia, matched for date of admission plus or minus 30 days. Urine and blood cultures positive for the same pathogen within 7 days were used to define catheter-associated bacteriuria and bacteremia. Multivariable conditional logistic regression was used to determine independent risk factors for bacteremia. Results The sample consisted of 158 cases and 474 controls. Independent predictors of bacteremia were male sex (odds ratio, 2.76), treatment with immunosuppressants (odds ratio, 1.68), urinary tract procedure (odds ratio, 2.70), and catheter that remained in place after bacteriuria developed (odds ratio, 2.75). Patients with enterococcal bacteriuria were half as likely to become bacteremic as were patients with other urinary pathogens (odds ratio, 0.46). Odds of secondary bacteremia increased 2% per additional day of hospital stay (95% CI, 1.01-1.04) and decreased 1% with each additional year of age (95% CI, 0.97-0.99). Conclusions The results add new information about increased risk for bacteremia among patients with catheters remaining in place after catheter-associated bacteriuria and confirm evidence for previously identified risk factors. PMID:27965229
Richet, H; Escande, M C; Marie, J P; Zittoun, R; Lagrange, P H
From 1 August 1978 through 31 December 1982, 98 hematology-oncology patients had positive cultures for Pseudomonas aeruginosa serotype O16; 22 of these patients developed bacteremia, and this bacteremia was associated with the occurrence of extensive perineal cellulitis in 10 patients (45.5%). Seventeen bacteremic patients died. The epidemic strain differed from other P. aeruginosa organisms isolated at the hospital by its resistance to all antibiotics available at that time (ticarcillin, piperacillin, azlocillin, tobramycin, ceftizoxime, ceftriaxone, moxalactam, ceftazidime, and fosfomycin). Univariate analysis showed the following factors to be significantly associated with P. aeruginosa O16 bacteremia: the severity of granulocytopenia at the time of the bacteremia, more days with fever, the administration of ticarcillin or an aminoglycoside, the receipt of a greater number of antimicrobial agents for a longer period of time before documentation of the bacteremia, and the occurrence of cellulitis. Logistic regression analysis showed that duration of fever, duration of bacteremia, and the number of antimicrobial agents administered before documentation of the bacteremia were the best predictors of P. aeruginosa O16 bacteremia. In a prospective study of the acquisition of P. aeruginosa by hematology-oncology patients, 1,149 specimens (throat and rectal swabs) from 270 patients and 201 specimens from their washbasin drains were collected. On only three occasions was the epidemic strain isolated from both the patient and his or her washbasin, but in each case the colonization of the patient preceded the isolation of the strain from the washbasin. The transmission of any P. aeruginosa organism from washbasin drain to patient could not be documented. Contact isolation precautions from the Centers for Disease Control were used for all hematology-oncology patients colonized or infected with P. aeruginosa after 7 January 1983. No case of P. aeruginosa O16 bacteremia has
Siedner, Mark J.; Galar, Alicia; Guzmán-Suarez, Belisa B.; Kubiak, David W.; Baghdady, Nour; Ferraro, Mary Jane; Hooper, David C.; O'Brien, Thomas F.; Marty, Francisco M.
Background. Carbapenems are recommended for treatment of Enterobacter infections with AmpC phenotypes. Although isolates are typically susceptible to cefepime in vitro, there are few data supporting its clinical efficacy. Methods. We reviewed all cases of Enterobacter species bacteremia at 2 academic hospitals from 2005 to 2011. Outcomes of interest were (1) persistent bacteremia ≥1 calendar day and (2) in-hospital mortality. We fit logistic regression models, adjusting for clinical risk factors and Pitt bacteremia score and performed propensity score analyses to compare the efficacy of cefepime and carbapenems. Results. Three hundred sixty-eight patients experienced Enterobacter species bacteremia and received at least 1 antimicrobial agent, of whom 52 (14%) died during hospitalization. Median age was 59 years; 19% were neutropenic, and 22% were in an intensive care unit on the day of bacteremia. Twenty-nine (11%) patients had persistent bacteremia for ≥1 day after antibacterial initiation. None of the 36 patients who received single-agent cefepime (0%) had persistent bacteremia, as opposed to 4 of 16 (25%) of those who received single-agent carbapenem (P < .01). In multivariable models, there was no association between carbapenem use and persistent bacteremia (adjusted odds ratio [aOR], 1.52; 95% CI, .58–3.98; P = .39), and a nonsignificant lower odds ratio with cefepime use (aOR, 0.52; 95% CI, .19–1.40; P = .19). In-hospital mortality was similar for use of cefepime and carbapenems in adjusted regression models and propensity-score matched analyses. Conclusions. Cefepime has a similar efficacy as carbapenems for the treatment of Enterobacter species bacteremia. Its use should be further explored as a carbapenem-sparing agent in this clinical scenario. PMID:24647022
Siedner, Mark J; Galar, Alicia; Guzmán-Suarez, Belisa B; Kubiak, David W; Baghdady, Nour; Ferraro, Mary Jane; Hooper, David C; O'Brien, Thomas F; Marty, Francisco M
Carbapenems are recommended for treatment of Enterobacter infections with AmpC phenotypes. Although isolates are typically susceptible to cefepime in vitro, there are few data supporting its clinical efficacy. We reviewed all cases of Enterobacter species bacteremia at 2 academic hospitals from 2005 to 2011. Outcomes of interest were (1) persistent bacteremia ≥1 calendar day and (2) in-hospital mortality. We fit logistic regression models, adjusting for clinical risk factors and Pitt bacteremia score and performed propensity score analyses to compare the efficacy of cefepime and carbapenems. Three hundred sixty-eight patients experienced Enterobacter species bacteremia and received at least 1 antimicrobial agent, of whom 52 (14%) died during hospitalization. Median age was 59 years; 19% were neutropenic, and 22% were in an intensive care unit on the day of bacteremia. Twenty-nine (11%) patients had persistent bacteremia for ≥1 day after antibacterial initiation. None of the 36 patients who received single-agent cefepime (0%) had persistent bacteremia, as opposed to 4 of 16 (25%) of those who received single-agent carbapenem (P < .01). In multivariable models, there was no association between carbapenem use and persistent bacteremia (adjusted odds ratio [aOR], 1.52; 95% CI, .58-3.98; P = .39), and a nonsignificant lower odds ratio with cefepime use (aOR, 0.52; 95% CI, .19-1.40; P = .19). In-hospital mortality was similar for use of cefepime and carbapenems in adjusted regression models and propensity-score matched analyses. Cefepime has a similar efficacy as carbapenems for the treatment of Enterobacter species bacteremia. Its use should be further explored as a carbapenem-sparing agent in this clinical scenario.
Tudela, P; Queralt, C; Giménez, M; Carreres, A; Tor, J; Sopena, N; Valencia, J
To know the prevalence, the clinical and microbiological characteristics of bacteremia episodes detected on discharged patients at the emergency unit, as well as the accordance of diagnostics and the predicting factors. We analysed the cases with bacteria detected on discharged patients during 2 years (1995-1996) in an university hospital. We reported: age, sex isolated organism in blood cultures, bacteremia source, leukocytes count, presence of underlying conditions, and accordance between initial and final diagnosis. We compared the characteristics of the groups with bacteremia without apparent origin and the ones with evident clinical source. We detected 61 cases, the mean age was 55 years (SD = 21), and 54% were males. The most commonly isolated agent was E. coli (50%). The leukocytes count was higher 10 x 10(9)/l in 15%. The source of bacteremia was: urinary tract infection (54%) no clinical focus (31%), respiratory tract (11%) and biliary duct (3%). The 90% of urinary tract and the 71% of respiratory infections were correctly diagnosed. However only the 5% of bacteremias without apparent source was correctly diagnosed. We found these differences statistically a significant (p < 0.001 and p = 0.002). Underlying conditions were detected in the 84% of cases in bacteremia without apparently source: AIDS (22%), cirrhosis (22%), parenteral drugs addiction (17%) and venous catheter (17%). Comparing both groups, with apparent focus and without it, we found that the presence of underlying condition is the only independent factor which predispose to bacteremia (p = 0.000; RR = 4.6; IC 95% = 1.9-11.8). The prevalence of bacteremia detected in discharged patients at the emergency unit seems acceptable. However those results suggest that we could decrease the number of patients with bacteremia without apparently source, because this group shows up to be the less successful in diagnosis. In patients with fever and no clinical focus in the emergency unit, it is useful to
Noguchi, Taro; Matsumura, Yasufumi; Yamamoto, Masaki; Nagao, Miki; Takakura, Shunji; Ichiyama, Satoshi
Cefotaxime plays an important role in the treatment of patients with bacteremia due to Enterobacteriaceae, although cefotaxime resistance is reported to be increasing in association with extended-spectrum β-lactamase (ESBL) and AmpC β-lactamase (AmpC). We conducted a case-control study in a Japanese university hospital between 2011 and 2012. We assessed the risk factors and clinical outcomes of bacteremia due to cefotaxime-non-susceptible Enterobacteriaceae (CTXNS-En) and analyzed the resistance mechanisms. Of 316 patients with Enterobacteriaceae bacteremia, 37 patients with bacteremia caused by CTXNS-En were matched to 74 patients who had bacteremia caused by cefotaxime-susceptible Enterobacteriaceae (CTXS-En). The most common CTXNS-En was Escherichia coli (43%), followed by Enterobacter spp. (24%) and Klebsiella spp. (22%). Independent risk factors for CTXNS-En bacteremia included previous infection or colonization of CTXNS-En, cardiac disease, the presence of intravascular catheter and prior surgery within 30 days. Patients with CTXNS-En bacteremia were less likely to receive appropriate empirical therapy and to achieve a complete response at 72 h than patients with CTXS-En bacteremia. Mortality was comparable between CTXNS-En and CTXS-En patients (5 vs. 3%). CTXNS-En isolates exhibited multidrug resistance but remained highly susceptible to amikacin and meropenem. CTX-M-type ESBLs accounted for 76% of the β-lactamase genes responsible for CTXNS E. coli and Klebsiella spp. isolates, followed by plasmid-mediated AmpC (12%). Chromosomal AmpC was responsible for 89% of CTXNS Enterobacter spp. isolates. CTXNS-En isolates harboring ESBL and AmpC caused delays in appropriate therapy among bacteremic patients. Risk factors and antibiograms may improve the selection of appropriate therapy for CTXNS-En bacteremia. Prevalent mechanisms of resistance in CTXNS-En were ESBL and chromosomal AmpC.
Khatib, Riad; Johnson, Leonard B; Fakih, Mohamad G; Riederer, Kathleen; Khosrovaneh, Amir; Shamse Tabriz, M; Sharma, Mamta; Saeed, Sajjad
Staphylococcus aureus bacteremia often persists. The reasons for persistence and its outcome are poorly defined. We conducted a prospective-observational study among 245 consecutive S. aureus (MRSA: n=125; MSSA: n=120) bacteremias (>or=1 positive blood cultures (BC)) among 234 adults (18-103-y-old; median=59 y) hospitalized during 1 January 2002-31 December 2002 at a 600-bed teaching hospital. Measurements included bacteremia duration, complication-rate (metastatic infection, relapse or attributable mortality) and outcome. Bacteremia duration was measured based on follow-up BC among 193 patients and estimated based on symptoms resolution in the rest. Measured (1-59 d; median=2) and estimated (median=1 d) duration correlated (r=0.885) though positive follow-up BC was often detected without fever (57/105 patients, 54.3%). Persistence (defined as bacteremia for >or=3 d) was noted in 84 cases (38.4%). Complication-rate increased steadily with bacteremia duration (6.6%, 24.0% and 37.7% in bacteremia for 1-2, 3 and >or=4 d, respectively; p=0.05). Cox regression analysis revealed that bacteremia duration correlated positively with endovascular sources (p=0.006), vancomycin treatment (p=0.016), cardiovascular prosthesis (p=0.025), metastatic infections (p=0.025) and diabetes (p=0.038). It is concluded that persistent bacteremia is a feature of S. aureus infection, irrespective of oxacillin susceptibility, associated with worse outcome. Risk factors include endovascular sources, cardiovascular prosthesis, metastatic infections, vancomycin treatment and diabetes. Patients at risk may benefit from novel treatment strategies.
Rodgers, G M; Barrera, E; Martin, R R
A patient with hemoglobin SC disease and cholelithiasis was found to have Bacillus cereus bacteremia. Hemolytic anemia developed, for which common causes of hemolysis were excluded, suggesting a relationship with the bacteremia. Following in vitro incubation, type O erythrocytes were hemolyzed by the culture, but not by a bacteria-free filtrate. This case confirms the association between sickle cell disorders and cholelithiasis with B cereus infections. In addition, it provides evidence for in vivo hemolysis with B cereus bacteremia, an organism not previously associated with hemolytic anemia.
Wan, Q Q; Ye, Q F; Yuan, H
Bloodstream infections (BSIs) remain as life-threatening complications and are associated with significant morbidity and mortality among solid organ transplant (SOT) recipients. Multidrug-resistant (MDR) Gram-negative bacteria can cause serious bacteremias in these recipients. Reviews have aimed to investigate MDR Gram-negative bacteremias; however, they were lacking in SOT recipients in the past. To better understand the characteristics of bacteremias due to MDR Gram-negative bacteria, optimize preventive and therapeutic strategies, and improve the outcomes of SOT recipients, this review summarize the epidemiology, clinical and laboratory characteristics, and explores the mechanisms, prevention, and treatment of MDR Gram-negative bacteria.
Hur, Jaehyung; Lee, Anna; Hong, Jeongmin; Jo, Won-Yong; Cho, Oh-Hyun; Kim, Sunjoo; Bae, In-Gyu
Staphylococcus saprophyticus is a common pathogen of acute urinary tract infection (UTI) in young females. However, S. saprophyticus bacteremia originating from UTI is very rare and has not been reported in Korea. We report a case of S. saprophyticus bacteremia from UTI in a 60-year-old female with a urinary stone treated successfully with intravenous ciprofloxacin, and review the cases of S. saprophyticus bacteremia reported in the literature. Thus, the microorganism may cause invasive infection and should be considered when S. saprophyticus is isolated from blood cultures in patients with UTI.
Lee, Anna; Hong, Jeongmin; Jo, Won-yong; Cho, Oh-Hyun; Kim, Sunjoo
Staphylococcus saprophyticus is a common pathogen of acute urinary tract infection (UTI) in young females. However, S. saprophyticus bacteremia originating from UTI is very rare and has not been reported in Korea. We report a case of S. saprophyticus bacteremia from UTI in a 60-year-old female with a urinary stone treated successfully with intravenous ciprofloxacin, and review the cases of S. saprophyticus bacteremia reported in the literature. Thus, the microorganism may cause invasive infection and should be considered when S. saprophyticus is isolated from blood cultures in patients with UTI. PMID:27433385
Medrano-Juarez, R. M.; Sotello, D.; D'Cuhna, L.; Payne, J. D.
We present a case of acute hemolytic anemia, renal failure, and Clostridium perfringens bacteremia in a patient with acute myelogenous leukemia. The high fatality of C. perfringens bacteremia requires that clinicians recognize and rapidly treat patients at risk for this infection. Although other hemolytic processes are in the differential diagnosis of these events, the presence of high fever, chills, and rapidly positive blood cultures may help narrow the diagnosis. Most cases of C. perfringens bacteremia have a concomitant coinfection, which makes broad spectrum empiric therapy essential. There is a high mortality rate of C. perfringens infections associated with leukemia. PMID:27774325
Moise, Pamela A; Sakoulas, George; McKinnell, James A; Lamp, Kenneth C; DePestel, Daryl D; Yoon, Min J; Reyes, Katherine; Zervos, Marcus J
In light of recent evidence suggesting enhancement of daptomycin activity against vancomycin-resistant Enterococcus (VRE) by ampicillin and other β-lactam antibiotics, we evaluated the safety profile and clinical efficacy of daptomycin with and without concomitant β-lactam antimicrobials in the treatment of VRE (faecium or faecalis) bacteremia from multiple centers across the United States. Data were collected retrospectively as part of a larger multicenter registry (The Cubicin Outcomes Registry and Experience). Efficacy and clinical outcomes in patients with VRE bacteremia who received at least 3 days of daptomycin with or without concomitant β-lactams were analyzed. Although all the cases involved daptomycin-susceptible VRE, additional analysis was performed to examine whether the adjunctive β-lactam would play a more pivotal role in cases where the daptomycin MIC was in the upper limit of the susceptibility range, indicating that daptomycin monotherapy efficacy may be relatively compromised compared with cases with lower daptomycin MICs. Two hundred sixty-two patients from 33 hospitals were evaluated. Most patients had at least one significant comorbidity, such as solid-organ or bone marrow transplantation (16%), neutropenia (36%), dialysis dependency (20%), or critical illness (36%) requiring care in an intensive care unit. Overall treatment success was 86% (n = 225/262), and treatment success for patients taking concomitant β-lactams was 86% (n = 105/122). Logistic regression identified treatment failure to be associated with sepsis (odds ratio = 3.42; P = 0.009) and an elevated daptomycin MIC (3-4 µg/mL) (odds ratio = 3.23, P = 0.013). No significant increase in clinical failure was seen among patients with elevated daptomycin MIC who received concomitant β-lactam therapy (clinical success, 88% vs 79% for MIC ≤2 vs 3-4 µg/mL, respectively; P = 0.417). Of 262 patients, 33 (13%) experienced ≥1 adverse event possibly related to daptomycin (increased
Krease, Michael; Stroup, Jeff; Som, Mousumi
Severe ulcerative colitis is defined by more than six bloody stools daily and evidence of toxicity, demonstrated by fever, tachycardia, anemia, or an elevated erythrocyte sedimentation rate. Fulminant disease represents a subset of severe disease with signs and symptoms suggestive of increased toxicity. Treatment of severe colitis includes intravenous corticosteroid administration, with consideration of intravenous infliximab 5 mg/kg. Failure to show improvement after 3 to 5 days is an indication for colectomy or treatment with intravenous cyclosporine. We report a 23-year-old Hispanic woman with decompensated cirrhosis presenting with new-onset fulminant ulcerative colitis and resulting polymicrobial bacteremia, requiring colectomy for infection source control and colitis treatment. PMID:27695178
Richert, Mary E.; Hosier, Hillary; Weltz, Adam S.; Wise, Eric S.; Joshi, Manjari; Diaz, Jose J.
Patient: Female, 28 Final Diagnosis: Acute transverse myelitis Symptoms: Ascending paralysis Medication: — Clinical Procedure: — Specialty: Infectious Diseases Objective: Rare disease Background: Acute transverse myelitis (ATM) is an uncommon and often overlooked complication of certain bacterial and viral infections that can have a rapid onset and result in severe neurological deficits. Case Report: This case report describes a previously healthy 28-year-old woman who presented to the trauma center after developing acute paralysis and paresthesias of all four extremities within the span of hours. The initial presumptive diagnosis was spinal cord contusion due to a fall versus an unknown mechanism of trauma, but eventual laboratory studies revealed Salmonella bacteremia, indicating a probable diagnosis of parainfectious ATM. Conclusions: This case illustrates the importance of considering the diagnosis of parainfectious ATM in patients presenting with acute paralysis with incomplete or unobtainable medical histories. PMID:27928148
Maya, Ivan D
Catheter-related bacteremia is a major cause of morbidity and mortality among catheter-dependent hemodialysis patients. Microorganism biofilm matrix formation in the catheter is the pathogenic process of this entity. Administration of systemic antibiotics and removal of the offending catheter is the most logical treatment. This article discusses an alternative option, instillation of an antibiotic-lock solution into the lumen of the catheter plus systemic antibiotic therapy. Recent studies suggest that this strategy could treat the infection and salvage the catheter, thus avoiding the need for further interventional procedures including but not limited to the removal of the catheter, placement of a temporary catheter, and finally placement of a new permanent catheter. The implementation of this effective approach will reduce morbidity and possibly reduce the cost and interventions associated with it.
Hernaiz, C; Picardo, A; Alos, J I; Gomez-Garces, J L
We present a case of Bacillus cereus bacteremia and catheter infection in an immunocompetent patient subjected to abdominal surgery, who recovered following central catheter removal and treatment with piperacillin/tazobactam.
Manassero, Norma Carolina; Navarro, Mercedes; Rocchi, Marta; di Bella, Horacio; Gasparotto, Ana M; Ocaña Carrizo, A Valeria; Novillo, Federico; Furiasse, Daniela; Monterisi, Aída
Enterococcal bacteremia has acquired considerable importance in recent years, mainly due to an increased number of cases that occur during hospital admission. We describe the episodes of enterococcal bacteremia in adult patients recorded at our hospital. Between January 2000 and December 2013, 117 episodes were analyzed. Sixty one percent (61%) of the patients were male and 39% female. The mean age was 68. Predisposing factors were present in 91% of patients. The primary source of infection was intraabdominal. Enterococcus faecalis was responsible for 65% of the cases; E. faecium for 28%; and other species for 7%. Thirty four percent (34%) of cases were polymicrobial bacteremia. All E. faecalis isolates were susceptible to ampicillin and vancomycin. Eighty eight percent (88%) of E. faecium were resistant to ampicillin and 54% to vancomycin and teicoplanin. In our hospital, Enterococcus is the sixth pathogen causing nosocomial bacteremia, with high incidence of ampicillin and vancomycin-resistant E. faecium.
Yamamoto, Kei; Hayakawa, Kayoko; Nagamatsu, Maki; Fujiya, Yoshihiro; Mawatari, Momoko; Kutsuna, Satoshi; Takeshita, Nozomi; Tamura, Saeko; Mezaki, Kazuhisa; Ohmagari, Norio
An 87-year-old man with poorly controlled diabetic mellitus presented with fever, bedsores, and elevated hepatobiliary enzyme levels. He was diagnosed with bacteremia with acute cholangitis due to Arthrobacter species, which are Gram-positive, aerobic, catalase-positive, coryneform bacteria belonging to the family Microbacteriaceae. Doripenem and subsequencial sulbactam/ampicillin treatment were used for the acute cholangitis, and the bacteremia was treated with a 2-week course of vancomycin. The bacteremia was misidentified by the phenotyping assay (API Coryne test), but was identified as Arthrobacter creatinolyticus by 16S rRNA and matrix-assisted laser-desorption/ionization time-of-flight mass spectrometry. To our knowledge, this is the first report of a human case of A. creatinolyticus bacteremia.
Vela, Ana I.; Falsen, Enevold; Simarro, Isabel; Rollan, Eduardo; Collins, Matthew D.; Domínguez, Lucas; Fernandez-Garayzabal, Jose F.
We report a case of bacteremia in puppies caused by Streptococcus dysgalactiae subsp. dysgalactiae. Identification was achieved by phenotypic and molecular genetic methods. This is the first report of the recovery of S. dysgalactiae subsp. dysgalactiae from dogs. PMID:16455943
Fisher, M C; Baluarte, H J; Long, S S
Bacteremia caused by Bacteroides fragilis occurred in four of 75 children after renal transplantation, and B. fragilis was the most common cause of postoperative bacteremia. Bacteroides bacteremia was significantly associated with performance of elective appendectomy at the time of transplantation (P less than 0.01) and with profound lymphocytopenia (P = 0.01). No patient received antibiotics at the time of surgery or prior to the first positive blood culture, yet B. fragilis was the single organism isolated from blood and abscesses in these patients. A role for lymphocytes in containment of B. fragilis has not been suggested previously, although unexplained occurrence of bacteroides bacteremia in immunocompromised patients has occasionally been reported. Lymphocytes themselves may be important in this host-bacterium interaction, or lymphocytopenia may be the marker for a more generalized deficiency in host defenses.
Rettew, Andrew; Shaikh, Bilal; Abdulkareem, Abdullateef
Worldwide, Shigellosis is a significant public health issue, associated with nearly one million deaths annually. About half a million cases of Shigella infection are reported annually in the United States. Shigella bacteremia is uncommon and generally seen in children and immunocompromised adults. We present a case of a Shigella sonnei bacteremia with marked hepatic derangement in a 27-year-old previously healthy homosexual male with history of Roux-en-Y gastric bypass, who presented to the emergency room with a 4-day history of loose watery stool, abdominal cramps, nausea and vomiting, and yellow skin of 2-day duration. He reports similar diarrhea illness in two close contacts in preceding days. On examination, he was fully oriented but dehydrated, icteric, and febrile. Laboratory data revealed WBC of 2200/μL, elevated AST and ALT (201 IU/L, 73 IU/L resp.), normal alkaline phosphatase, elevated total and direct bilirubin of 8.2 mg/dL and 4.4 mg/dL, albumin of 3.2 g/dL, INR of 2.9, prothrombin time of 31.7, and platelet of 96,000/μL. Workup for infectious, autoimmune and medication-induced hepatitis, Wilson's disease, and hemochromatosis was negative. Abdominal ultrasound and computed tomography of the abdomen showed hepatic steatosis and right-sided colitis. Stool and blood cultures were positive for Shigella sonnei. He was treated with ciprofloxacin with improvement in liver function. Follow-up blood test 4 months later was within normal limits. PMID:28326205
Pitassi, Luiza Helena Urso; de Paiva Diniz, Pedro Paulo Vissotto; Scorpio, Diana Gerardi; Drummond, Marina Rovani; Lania, Bruno Grosselli; Barjas-Castro, Maria Lourdes; Gilioli, Rovilson; Colombo, Silvia; Sowy, Stanley; Breitschwerdt, Edward B.; Nicholson, William L.; Velho, Paulo Eduardo Neves Ferreira
Bartonella species are blood-borne, re-emerging organisms, capable of causing prolonged infection with diverse disease manifestations, from asymptomatic bacteremia to chronic debilitating disease and death. This pathogen can survive for over a month in stored blood. However, its prevalence among blood donors is unknown, and screening of blood supplies for this pathogen is not routinely performed. We investigated Bartonella spp. prevalence in 500 blood donors from Campinas, Brazil, based on a cross-sectional design. Blood samples were inoculated into an enrichment liquid growth medium and sub-inoculated onto blood agar. Liquid culture samples and Gram-negative isolates were tested using a genus specific ITS PCR with amplicons sequenced for species identification. Bartonella henselae and Bartonella quintana antibodies were assayed by indirect immunofluorescence. B. henselae was isolated from six donors (1.2%). Sixteen donors (3.2%) were Bartonella-PCR positive after culture in liquid or on solid media, with 15 donors infected with B. henselae and one donor infected with Bartonella clarridgeiae. Antibodies against B. henselae or B. quintana were found in 16% and 32% of 500 blood donors, respectively. Serology was not associated with infection, with only three of 16 Bartonella-infected subjects seropositive for B. henselae or B. quintana. Bartonella DNA was present in the bloodstream of approximately one out of 30 donors from a major blood bank in South America. Negative serology does not rule out Bartonella spp. infection in healthy subjects. Using a combination of liquid and solid cultures, PCR, and DNA sequencing, this study documents for the first time that Bartonella spp. bacteremia occurs in asymptomatic blood donors. Our findings support further evaluation of Bartonella spp. transmission which can occur through blood transfusions. PMID:25590435
Darmstadt, Gary L.; Carlin, John B.; Zaidi, Anita K. M.; Yeboah-Antwi, Kojo; Saha, Samir K.; Ray, Pallab; Narang, Anil; Mazzi, Eduardo; Kumar, Praveen; Kapil, Arti; Jeena, Prakash M.; Deorari, Ashok; Chowdury, A.K. Azad; Bartos, Andrés; Bhutta, Zulfiqar A.; Adu-Sarkodie, Yaw; Adhikari, Miriam; Addo-Yobo, Emmanuel; Weber, Martin W.
Background: Neonatal illness is a leading cause of death worldwide; sepsis is one of the main contributors. The etiologies of community-acquired neonatal bacteremia in developing countries have not been well characterized. Methods: Infants <2 months of age brought with illness to selected health facilities in Bangladesh, Bolivia, Ghana, India, Pakistan and South Africa were evaluated, and blood cultures taken if they were considered ill enough to be admitted to hospital. Organisms were isolated using standard culture techniques. Results: Eight thousand eight hundred and eighty-nine infants were recruited, including 3177 0–6 days of age and 5712 7–59 days of age; 10.7% (947/8889) had a blood culture performed. Of those requiring hospital management, 782 (54%) had blood cultures performed. Probable or definite pathogens were identified in 10.6% including 10.4% of newborns 0–6 days of age (44/424) and 10.9% of infants 7–59 days of age (39/358). Staphylococcus aureus was the most commonly isolated species (36/83, 43.4%) followed by various species of Gram-negative bacilli (39/83, 46.9%; Acinetobacter spp., Escherichia coli and Klebsiella spp. were the most common organisms). Resistance to second and third generation cephalosporins was present in more than half of isolates and 44% of the Gram-negative isolates were gentamicin-resistant. Mortality rates were similar in hospitalized infants with positive (5/71, 7.0%) and negative blood cultures (42/557, 7.5%). Conclusions: This large study of young infants aged 0–59 days demonstrated a broad array of Gram-positive and Gram-negative pathogens responsible for community-acquired bacteremia and substantial levels of antimicrobial resistance. The role of S. aureus as a pathogen is unclear and merits further investigation. PMID:25389919
Hamer, Davidson H; Darmstadt, Gary L; Carlin, John B; Zaidi, Anita K M; Yeboah-Antwi, Kojo; Saha, Samir K; Ray, Pallab; Narang, Anil; Mazzi, Eduardo; Kumar, Praveen; Kapil, Arti; Jeena, Prakash M; Deorari, Ashok; Chowdury, A K Azad; Bartos, Andrés; Bhutta, Zulfiqar A; Adu-Sarkodie, Yaw; Adhikari, Miriam; Addo-Yobo, Emmanuel; Weber, Martin W
Neonatal illness is a leading cause of death worldwide; sepsis is one of the main contributors. The etiologies of community-acquired neonatal bacteremia in developing countries have not been well characterized. Infants <2 months of age brought with illness to selected health facilities in Bangladesh, Bolivia, Ghana, India, Pakistan and South Africa were evaluated, and blood cultures taken if they were considered ill enough to be admitted to hospital. Organisms were isolated using standard culture techniques. Eight thousand eight hundred and eighty-nine infants were recruited, including 3177 0-6 days of age and 5712 7-59 days of age; 10.7% (947/8889) had a blood culture performed. Of those requiring hospital management, 782 (54%) had blood cultures performed. Probable or definite pathogens were identified in 10.6% including 10.4% of newborns 0-6 days of age (44/424) and 10.9% of infants 7-59 days of age (39/358). Staphylococcus aureus was the most commonly isolated species (36/83, 43.4%) followed by various species of Gram-negative bacilli (39/83, 46.9%; Acinetobacter spp., Escherichia coli and Klebsiella spp. were the most common organisms). Resistance to second and third generation cephalosporins was present in more than half of isolates and 44% of the Gram-negative isolates were gentamicin-resistant. Mortality rates were similar in hospitalized infants with positive (5/71, 7.0%) and negative blood cultures (42/557, 7.5%). This large study of young infants aged 0-59 days demonstrated a broad array of Gram-positive and Gram-negative pathogens responsible for community-acquired bacteremia and substantial levels of antimicrobial resistance. The role of S. aureus as a pathogen is unclear and merits further investigation.
Oteo, J; Aracil, B; Ignacio Alós, J; Luis Gómez-Garcés, J
Corynebacterium sp. is an extremely varied genus which includes little known species and of which only Corynebacterium diphteriae, Corynebacterium urealyticum and Corynebacterium jeikeium are considered indisputable pathogens. Other species, such as C. amycolatum are at present being reconsidered as causative agents in infectious pathologies, partly on account of our greater aquaintance and improved identification techniques for these microorganisms and partly on account of the growing number of immunocompromised patients in whom all their pathogenic capacity is usually able to develope. We present 3 cases of significant bacteremia by C. amycolatum. Bacterial isoliations from blood culture were obtained using the Vital Systems. Identification was performed by means of Gran stain, colony morphology, the results of numerous biochemical tests (including the Api Coryne systems), the behaviour of the strains against the vibriostatic agent O/129 and the antibiotic susceptibility pattern obtained with the E-test. The three isolates of C. amycolatum were obtained from patients after a lenghtly hospitalization, multi-instrumentation and who had severe underlying disease. All three presented with concomitant isolates of C. amycolatum from other sites: sputum, wound and catheter respectively, which could explain the origin of the bacteremia. Colony morphology, antibiotic susceptibility patterns, resistance to the vibriostatic agent O/129 and the results of the biochemical test carried out were similar to those previously describe in the literature. C. amycolatum should be born in mind as a agent responsable for significant and severe pathology in this type of patient. In addition, it as certain specific characteristics which assits in its identification in the normal micr
Roig, P P; López, M M; Martín, C; Zorraquino, A; Sánchez, B; Navarro, V; Merino, J
Capnocytophaga sp. is a gram-negative bacilli, scarcely documented as the cause of bacteremias. Two cases of bacteremia caused by Capnocytophaga sp, one of them with endocarditis, are reported here. A review of previous published cases is also presented. One of the patients was immunocompromised, because of chemotherapy, the other, suffered from a rheumatic-cardiopathy which was complicated with endocarditis. Both patients developed an alteration of the oral mucosa. Antibiotic therapy proved to be effective with two patients.
San-Juan, Rafael; Lalueza, Antonio; Sanz, Francisca; Rodríguez-Otero, Joaquin; Gómez-Gonzalez, Carmen; Chaves, Fernando
We conducted a retrospective study of 99 patients with methicillin-suseptible Staphylococcus aureus catheter-related bacteremia in which vancomycin MIC was determined by Etest. High vancomycin MIC (>1.5 μg/mL) was the only independent risk factor for development of complicated bacteremia caused by methicillin-susceptible S. aureus (odds ratio 22.9, 95% confidence interval 6.7–78.1). PMID:21749780
Rosenbaum, G.S.; Calubiran, O.; Cunha, B.A. )
A young woman with a history of sick sinus syndrome and placement of a permanent pacemaker 6 months before admission had fever and Haemophilus parainfluenzae bacteremia. A gallium scan localized the infection to the site of the pacemaker wire. Echocardiograms were negative for any vegetations. The patient responded to cefotaxime and trimethoprim-sulfamethoxazole therapy. We believe that this is the first case of H. parainfluenzae bacteremia associated with a pacemaker wire and localized by gallium scan.
Ito, Ryota; Shindo, Yuichiro; Kobayashi, Daisuke; Ando, Masahiko; Jin, Wanchun; Wachino, Jun-ichi; Yamada, Keiko; Kimura, Kouji; Yagi, Tetsuya; Hasegawa, Yoshinori
Some important virulence factors have been elucidated in Klebsiella pneumoniae infections. We investigated the relationship between virulence factors and multilocus sequence types (STs) and assessed the risk factors for bacteremia in patients with pneumonia due to K. pneumoniae. From April 2004 through April 2012, a total of 120 K. pneumoniae isolates from patients with pneumonia (23 with bacteremia and 97 without bacteremia) were collected from 10 medical institutions in Japan. Additionally, 10 strains of K. pneumoniae serotype K2 that were isolated >30 years ago were included in this study. These isolates were characterized using multilocus sequence typing (MLST), and the characteristics of their virulence factors, such as hypermucoviscosity phenotype and RmpA and aerobactin production between patients with and without bacteremia, were examined. MLST analysis was performed on the 120 isolates from patients with pneumonia, and some sequence type groups were defined as genetic lineages (GLs). GL65 was more prevalent among patients with bacteremia (21.7%) than in those without bacteremia (7.2%). The majority of the strains with serotype K2 were classified into GL14 or GL65, and rmpA and the gene for aerobactin were present in all GL65-K2 strains but absent in all GL14-K2 strains. In a multivariate analysis, the independent risk factors for bacteremia included GL65 (adjusted odds ratio [AOR], 9.46; 95% confidence interval [CI], 1.81 to 49.31), as well as neoplastic disease (AOR, 9.94; 95% CI, 2.61 to 37.92), immunosuppression (AOR, 17.85; 95% CI, 1.49 to 214.17), and hypoalbuminemia (AOR, 4.76; 95% CI, 1.29 to 17.61). GL65 was more prevalent among patients with bacteremia and was associated with the virulence factors of K. pneumoniae. PMID:25568434
Ito, Ryota; Shindo, Yuichiro; Kobayashi, Daisuke; Ando, Masahiko; Jin, Wanchun; Wachino, Jun-ichi; Yamada, Keiko; Kimura, Kouji; Yagi, Tetsuya; Hasegawa, Yoshinori; Arakawa, Yoshichika
Some important virulence factors have been elucidated in Klebsiella pneumoniae infections. We investigated the relationship between virulence factors and multilocus sequence types (STs) and assessed the risk factors for bacteremia in patients with pneumonia due to K. pneumoniae. From April 2004 through April 2012, a total of 120 K. pneumoniae isolates from patients with pneumonia (23 with bacteremia and 97 without bacteremia) were collected from 10 medical institutions in Japan. Additionally, 10 strains of K. pneumoniae serotype K2 that were isolated >30 years ago were included in this study. These isolates were characterized using multilocus sequence typing (MLST), and the characteristics of their virulence factors, such as hypermucoviscosity phenotype and RmpA and aerobactin production between patients with and without bacteremia, were examined. MLST analysis was performed on the 120 isolates from patients with pneumonia, and some sequence type groups were defined as genetic lineages (GLs). GL65 was more prevalent among patients with bacteremia (21.7%) than in those without bacteremia (7.2%). The majority of the strains with serotype K2 were classified into GL14 or GL65, and rmpA and the gene for aerobactin were present in all GL65-K2 strains but absent in all GL14-K2 strains. In a multivariate analysis, the independent risk factors for bacteremia included GL65 (adjusted odds ratio [AOR], 9.46; 95% confidence interval [CI], 1.81 to 49.31), as well as neoplastic disease (AOR, 9.94; 95% CI, 2.61 to 37.92), immunosuppression (AOR, 17.85; 95% CI, 1.49 to 214.17), and hypoalbuminemia (AOR, 4.76; 95% CI, 1.29 to 17.61). GL65 was more prevalent among patients with bacteremia and was associated with the virulence factors of K. pneumoniae. Copyright © 2015, American Society for Microbiology. All Rights Reserved.
Nei, Takahito; Sonobe, Kazunari; Onodera, Asaka; Itabashi, Toshikazu; Yamaguchi, Hiroki; Maeda, Miho; Saito, Ryoichi
Pseudomonas oryzihabitans (formerly Flavimonas oryzihabitans) is a glucose non-fermentative, Gram-negative bacillus which is rarely isolated from human specimens. When isolated, it is on very rare occasion as a causative pathogen of catheter-related bloodstream infection in an immunocompromised patient. Herein, we describe two hematological malignancy patients suspected to have P. oryzihabitans bacteremia. We also review cases with bacteremia due to this pathogen and its microbiological characteristics.
Jean, G; Charra, B; Chazot, C; Vanel, T; Terrat, J C; Hurot, J M; Laurent, G
Infection, mainly related to vascular access, is one of the main causes of morbidity and a preventable cause of death in hemodialysis patients. From January 1994 to April 1998 we conducted a prospective study to assess the incidence and risk factors of catheter-related bacteremia. One hundred and twenty-nine tunneled dual-lumen hemodialysis catheters were inserted percutaneously into the internal jugular vein in 89 patients. Bacteremia (n = 56) occurred at least once with 37 (29%) of the catheters (an incidence of 1.1/1,000 catheter-days); local infection (n = 45, 1/1,000 catheter-days) was associated with bacteremia in 18 cases. Death in 1 case was directly related to Staphylococcus aureus (SA) septic shock, and septicemia contributed to deaths in 2 additional cases. Catheters were removed in 48% of the bacteremic episodes. Treatment comprised intravenous double antimicrobial therapy for 15-20 days. Bacteriological data of bacteremia showed 55% involvement of SA. Nasal carriage of SA was observed in 35% of the patients with catheters. Bacteremic catheters were more frequently observed in patients with diabetes mellitus (p = 0.03), peripheral atherosclerosis (p = 0.001), a previous history of bacteremia (p = 0.05), nasal carriage of SA (p = 0.0001), longer catheter survival time (p = 0.001), higher total intravenous iron dose (p = 0.001), more frequent urokinase catheter infusion (p < 0.01), and local infection (p < 0.001) compared with non-bacteremic catheters. Monovariate survival analysis showed that significant initial risk factors for bacteremia were nasal carriage of SA (p = 0.00001), previous bacteremia (p = 0.0001), peripheral atherosclerosis (p = 0.005), and diabetes (p = 0.04). This study confirms the relatively high incidence of bacteremia with tunneled double-lumen silicone catheters and its potential complications. Possible preventive actions are discussed according to the risk factors.
Cost, Carrye R; Stegner, Martha M; Leonard, David; Leavey, Patrick
Despite a low bacteremia rate, pediatric oncology patients are frequently admitted for febrile neutropenia. A pediatric risk prediction model with high sensitivity to identify patients at low risk for bacteremia is not available. We performed a single-institution prospective cohort study of pediatric oncology patients with febrile neutropenia to create a risk prediction model using clinical factors, respiratory viral infection, and cytokine expression. Pediatric oncology patients with febrile neutropenia were enrolled between March 30, 2010 and April 1, 2011 and managed per institutional protocol. Blood samples for C-reactive protein and cytokine expression and nasopharyngeal swabs for respiratory viral testing were obtained. Medical records were reviewed for clinical data. Statistical analysis utilized mixed multiple logistic regression modeling. During the 12-month period, 195 febrile neutropenia episodes were enrolled. There were 24 (12%) episodes of bacteremia. Univariate analysis revealed several factors predictive for bacteremia, and interleukin (IL)-8 was the most predictive variable in the multivariate stepwise logistic regression. Low serum IL-8 predicted patients at low risk for bacteremia with a sensitivity of 0.9 and negative predictive value of 0.98. IL-8 is a highly sensitive predictor for patients at low risk for bacteremia. IL-8 should be utilized in a multi-institution prospective trial to assign risk stratification to pediatric patients admitted with febrile neutropenia.
Waghmare, Alka S.; Vhanmane, Priyanka B.; Savitha, B.; Chawla, Ruhee L.; Bagde, Hiroj S.
Background: Bacteremia frequently occurs after treatment procedures such as extractions, scaling, root planing, periodontal surgery. There is currently significant interest in the possibility that bacteremia with oral bacteria may play role in pathogenesis of atherosclerosis. There are well-conducted studies that have determined the frequency of passage of periodontal microorganisms to the bloodstream after periodontal treatment. There is scarce information related to the incidence of periodontopathic microorganisms during bacteremia induced by this procedure. Aim: The aim of this study was to establish the frequency of passage of periodontopathic microorganisms in peripheric blood after scaling and root planing in patients with periodontitis. Materials and Methods: Forty subjects with chronic periodontitis were included in the study. Blood samples were drawn from each patient at following intervals pre-treatment i.e., before SRP (P1), immediately after SRP (P2), and 30 minutes after SRP (P3). Following SRP, blood samples were analyzed for following microorganisms: Porphyromonasgingivalis, Tannerella. forysthus, Eikenellanella. corrodens, Campylobacter species, Micromonas. micros, and Prevotella. intermedia. Statistical Analysis Used: Chi-square test. Results: Bacteremia was found in 70% (28/40) immediately after SRP and after 30 min, it was reduced to 25% (10/40) and 7.5% (3/40) presented bacteremia before SRP. Conclusions: It was concluded that bacteremia frequently occurs immediately after SRP with P. gingivalis showing the highest frequency in blood. PMID:24554880
Berezin, Eitan Naaman; Iazzetti, Marco Antonio
We reviewed the incidence of occult bacteremia, to identify the most frequent etiological agents of bacteremias in otherwise healthy children from one month to 10 years old, who had fever of unknown origin attended at the emergency ward of an urban, university-affiliated pediatric referral center. This was a retrospective medical record review, evaluating children with fever. Data were collected from the initial visit, when blood cultures, hematological properties and hemosedimentation rates were examined. Fever was considered as the highest temperature assessed in the hospital or reported by the responsible adult. Occult bacteremia was discovered in 1.4% of the 1,051 children evaluated, and the most common etiologic agent was Streptococcus pneumoniae. Total leukocyte count and blood sedimentation rates greater than 30 mm(3) were not predictive factors for occult bacteremia. Fever greater than 39 masculineC was the most important factor for predicting occult bacteremia (P<0.001). The presence of occult bacteremia was significantly correlated with patient hospitalization.
Demirdal, Tuna; Demirturk, Nese; Cetinkaya, Zafer; Tufan, Gulnihal
In this retrospective study, the investigators examined blood cultures from patients that had been diagnosed with bacteremias over a 3-y period. The study was conduced at Kocatepe University Hospital (Middle Anatolia, Turkey). Blood samples that arrived at the university's microbiology laboratory between 2002 and 2005 were evaluated retrospectively. These samples were classified as contamination, false positivity, community-acquired bacteremia (CAB), or hospital-acquired bacteremia (HAB). Patient age and sex, foci of bacteremia, present comorbidities, predisposing factors, pathogens, and mortality rates were evaluated. A total of 1783 blood cultures that had been drawn from 1441 patients during this 3-y period were examined retrospectively. Of 354 positive isolates, 61 (17.2%) were CABs and 293 (82.8%) were HABs. In HABs, the most commonly isolated microorganisms were Staphylococcus aureus (37.5%), coagulase-negative staphylococci (29.7%), and Escherichia coli (10.2%); in CABs, the most commonly isolated microorganisms were S aureus (29.5%), Brucella spp (26.2%), and E coli (24.6%). Crude mortality rates were determined to be 15.2% for HABs and 12.7% for CABs. This study yielded data on the most common foci of bacteremia, microbiologic factors, and the epidemiology associated with HABs and CABs. It is hoped that these data will enhance empirical antibiotic therapeutic approaches, thereby preventing delays in treatment and decreasing mortality rates associated with bacteremias.
van den Berg, Sanne; de Vogel, Corné P; van Belkum, Alex; Bakker-Woudenberg, Irma A J M
Staphylococcus aureus carriers with S. aureus bacteremia may have a reduced mortality risk compared to non-carriers. A role for the immune system is suggested. Here, we study in mice the effect of mild S. aureus skin infection prior to endogenous or exogenous S. aureus bacteremia, and evaluate protection in relation to anti-staphylococcal antibody levels. Skin infections once or twice by a clinical S. aureus isolate (isolate P) or S. aureus strain 8325-4 were induced in mice free of S. aureus and anti-staphylococcal antibodies. Five weeks later, immunoglobulin G (IgG) levels in blood against 25 S. aureus antigens were determined, and LD50 or LD100 bacteremia caused by S. aureus isolate P was induced. S. aureus skin infections led to elevated levels of anti-staphylococcal IgG in blood. One skin infection improved the course of subsequent severe endogenous bacteremia only. A second skin infection further improved animal survival rate, which was associated with increased pre-bacteremia IgG levels against Efb, IsaA, LukD, LukE, Nuc, PrsA and WTA. In conclusion, S. aureus isolate P skin infection in mice reduces the severity of subsequent endogenous S. aureus bacteremia only. Although cellular immune effects cannot be rules out, anti-staphylococcal IgG against specified antigens may contribute to this effect.
van den Berg, Sanne; de Vogel, Corné P.; van Belkum, Alex; Bakker-Woudenberg, Irma A. J. M.
Staphylococcus aureus carriers with S. aureus bacteremia may have a reduced mortality risk compared to non-carriers. A role for the immune system is suggested. Here, we study in mice the effect of mild S. aureus skin infection prior to endogenous or exogenous S. aureus bacteremia, and evaluate protection in relation to anti-staphylococcal antibody levels. Skin infections once or twice by a clinical S. aureus isolate (isolate P) or S. aureus strain 8325-4 were induced in mice free of S. aureus and anti-staphylococcal antibodies. Five weeks later, immunoglobulin G (IgG) levels in blood against 25 S. aureus antigens were determined, and LD50 or LD100 bacteremia caused by S. aureus isolate P was induced. S. aureus skin infections led to elevated levels of anti-staphylococcal IgG in blood. One skin infection improved the course of subsequent severe endogenous bacteremia only. A second skin infection further improved animal survival rate, which was associated with increased pre-bacteremia IgG levels against Efb, IsaA, LukD, LukE, Nuc, PrsA and WTA. In conclusion, S. aureus isolate P skin infection in mice reduces the severity of subsequent endogenous S. aureus bacteremia only. Although cellular immune effects cannot be rules out, anti-staphylococcal IgG against specified antigens may contribute to this effect. PMID:26060995
Seo, Dong Young; Jo, Sion; Lee, Jae Baek; Jin, Young Ho; Jeong, Taeoh; Yoon, Jaechol; Park, Boyoung
The purpose of the present study was to investigate the diagnostic value of lactate for predicting bacteremia in female patients with acute pyelonephritis (APN). We conducted a retrospective study of female patients with APN who visited the study hospital emergency department. The demographics, comorbidities, physiologies, and laboratory variables including white blood cell count and segmented neutrophil count, C-reactive protein, and initial serum lactate levels were collected and analyzed to identify associations with the presence of bacteremia. During the study period, a total of 314 patients were enrolled. One hundred twenty-three patients (39.2%) had bacteremia. Escherichia coli was the most frequent pathogen. Logistic regression analysis demonstrated that the lactate level was independently associated with the presence of bacteremia (odds ratio, 1.39 [95% confidence interval, 1.08-1.78]). The C-statistic of the lactate level was 0.67 (95% CI, 0.60-0.73). At a cutoff value of 1.4mmol/L, the lactate level predicted bacteremia with a sensitivity (53.7%), specificity (72.3%), positive predictive value (55.5%), negative predictive value (70.8%), positive likelihood ratio (1.93), and negative likelihood ratio (0.64). The initial serum lactate level showed poor discriminative performance for predicting bacteremia in female patients with APN. Copyright © 2016 Elsevier Inc. All rights reserved.
Ouyang, Wen; Li, Xiaoxiao; Wan, Qiquan; Ye, Qifa
Although bacteremias due to the six ESKAPE pathogens have recently been identified as a serious emerging problems in solid organ transplant (SOT), no information in liver transplant recipients is available. We sought to investigate the risk factors for mortality and septic shock in liver transplant recipients with ESKAPE bacteremia. A retrospective analysis of bacteremia after liver transplantation was reviewed. Risk factors for mortality and septic shock caused by ESKAPE bacteremia were identified. Forty-nine episodes ofbacteremia in 37 liver transplant recipients were due to ESKAPE strains. The only factor for bacteremia-related mortality independently associated with ESKAPE was septic shock (odds ratio [OR] = 67.500, 95% confidence interval [CI] = 8.464-538.300, P < .001). The factors for septic shock independently associated with ESKAPE were white blood cells count > 15,000/mm3 (OR = 15.205, 95% CI = 2.271-101.799, P = .005) and temperature of 39 °C or greater (OR = 10.959, 95% CI = 1.592-75.450, P = .015). To improve the results of liver transplantation, more effectively therapeutic treatments are of paramount importance when liver transplant recipients with ESKAPE bacteremia present with septic shock, elevated white blood cells count and high body temperature.
Pujol, M; Peña, C; Pallares, R; Ayats, J; Ariza, J; Gudiol, F
In a prospective surveillance study (February 1990-December 1991) performed at a 1000-bed teaching hospital to identify risk factors for nosocomial methicillin-resistant Staphylococcus aureus (MRSA) bacteremia, 309 patients were found to be colonized (n = 103; 33%) or infected (n = 206; 67%) by MRSA. Sixty-three of them developed bacteremia. Compared with 114 patients who had nosocomial bacteremia caused by methicillin-sensitive Staphylococcus aureus during the same period of time, MRSA bacteremic patients had more severe underlying diseases (p < 0.01), were more often in intensive care units (p < 0.01) and had received prior antibiotic therapy more frequently (p < 0.01). To further identify risk factors for MRSA bacteremia, univariate and multivariate analyses of this series of 309 patients were performed using the occurrence of MRSA bacteremia as the dependent variable. Among 14 variables analyzed, intravascular catheterization, defined as one or more intravascular catheters in place for more than 48 h, was the only variable selected by a logistic regression model as an independent risk factor (OR = 2.7, CI = 1.1-6.6). The results of this study reinforce the concept that recent antibiotic therapy may predispose patients to MRSA infection and suggest that among patients colonized or infected by MRSA, those with intravascular catheters are at high risk of developing MRSA bacteremia.
Jepsen, O B; Korner, B
A prospective clinical-bacteriological study of 102 consecutive cases of confirmed bacteremia at a Copenhagen City general hospital was carried out during 5 months of 1973 with special concern given to focus of infection and acquisition of microorganisms. Valid positive cultures were obtained from 7.2 patients per 1000 admissions. 50 of the 102 bacteremias were by all probability acquired in the hospital, mainly due to transurethral manipulations or intravenous lines. Pneumonia and hepatobiliary infections accounted for most of the non-hospital acquired bacteremias. 26/102 patients died in relation to the bacteremia. Escherichia coli and Staphylococcus aureus caused more than half of the infections. Bacteremia caused by proteus, klebsiella, enterobacter species of staphylococci was in most cases nosocomial and carried the highest mortality, i.e. 40%, verus 15% when other organisms were responsible. It is concluded that nosocomial bacteremia is a frequent and life-endangering complication which is often preceded by certain diagnostic or therapeutic procedures, not invariably linked to severe underlying diseases. Consequently, attempts to reduce bacteremic episodes should include surveillance of ecological factors and certain hospital procedures.
Imafuku, A; Araoka, H; Tanaka, K; Marui, Y; Sawa, N; Ubara, Y; Takaichi, K; Ishii, Y; Tomikawa, S
Helicobacter cinaedi can cause bacteremia mainly in immunocompromised patients. We present the clinical characteristics of H. cinaedi bacteremia in 4 renal transplant patients. Interestingly, all cases showed triggers of bacterial translocation: 2 cases developed after colonic perforation caused by diverticulitis, 1 case developed post cholecystectomy, and the remaining patient had chronic diarrhea. Accordingly, bacterial translocation caused by severe gastrointestinal complication could be a cause of H. cinaedi bacteremia.
Joo, Eun-Jeong; Kang, Cheol-In; Ha, Young Eun; Kim, Jungok; Kang, Seung-Ji; Park, So Yeon; Lee, Nam Yong; Wi, Yu Mi; Chung, Doo Ryeon; Peck, Kyong Ran; Song, Jae-Hoon
This study was performed to identify risk factors in Pseudomonas aeruginosa bacteremia among Gram-negative bacterial infections in non-neutropenic patients with solid tumor. A case-control study was performed to identify clinical predictors for P. aeruginosa bacteremia among non-neutropenic patients with Gram-negative bacteremia. Each case of P. aeruginosa bacteremia was matched to one or two controls with Escherichia coli, Klebsiella, Enterobacter or Citrobacter species in non-neutropenic patients with solid tumor. Seventy-eight patients with P. aeruginosa bacteremia were compared with 98 control patients who had other Gram-negative bacteremias. The most common types of cancer were biliary tract cancer (49/176, 27.8%) and hepatocellular carcinoma (38/176, 21.6%), followed by gastric and bladder cancer. Factors associated with development of P. aeruginosa bacteremia were the presence of lung cancer, percutaneous tubes, nosocomial exposure, an invasive procedure and previous antimicrobial therapy (all P < 0.05). Independent risk factors for P. aeruginosa bacteremia included the presence of lung cancer and previous antimicrobial therapy. In the subgroup analysis including 90 patients with community-onset bacteremia, the previous use of antimicrobial agents and presence of bladder cancer were independent factors significantly associated with P. aeruginosa bacteremia. Underlying lung cancer and previous antimicrobial treatment were significantly associated with P. aeruginosa bacteremia in non-neutropenic patients with solid tumor. P. aeruginosa should be considered as a probable cause of Gram-negative bacteremia in this patient group. Copyright © 2011 The British Infection Association. Published by Elsevier Ltd. All rights reserved.
Riu, Marta; Chiarello, Pietro; Terradas, Roser; Sala, Maria; Garcia-Alzorriz, Enric; Castells, Xavier; Grau, Santiago; Cots, Francesc
To calculate the incremental cost of nosocomial bacteremia caused by the most common organisms, classified by their antimicrobial susceptibility. We selected patients who developed nosocomial bacteremia caused by Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, or Pseudomonas aeruginosa. These microorganisms were analyzed because of their high prevalence and they frequently present multidrug resistance. A control group consisted of patients classified within the same all-patient refined-diagnosis related group without bacteremia. Our hospital has an established cost accounting system (full-costing) that uses activity-based criteria to analyze cost distribution. A logistic regression model was fitted to estimate the probability of developing bacteremia for each admission (propensity score) and was used for propensity score matching adjustment. Subsequently, the propensity score was included in an econometric model to adjust the incremental cost of patients who developed bacteremia, as well as differences in this cost, depending on whether the microorganism was multidrug-resistant or multidrug-sensitive. A total of 571 admissions with bacteremia matched the inclusion criteria and 82,022 were included in the control group. The mean cost was € 25,891 for admissions with bacteremia and € 6,750 for those without bacteremia. The mean incremental cost was estimated at € 15,151 (CI, € 11,570 to € 18,733). Multidrug-resistant P. aeruginosa bacteremia had the highest mean incremental cost, € 44,709 (CI, € 34,559 to € 54,859). Antimicrobial-susceptible E. coli nosocomial bacteremia had the lowest mean incremental cost, € 10,481 (CI, € 8,752 to € 12,210). Despite their lower cost, episodes of antimicrobial-susceptible E. coli nosocomial bacteremia had a major impact due to their high frequency. Adjustment of hospital cost according to the organism causing bacteremia and antibiotic sensitivity could improve prevention strategies and allow
Wu, Hua; Li, Dongdong; Zhou, Haijian; Sun, Yunfang; Guo, Ling; Shen, Dingxia
To investigate bacteremia and other body site infection caused by hypervirulent Klebsiella pneumoniae (hvKP), a recently recognized pathogen of invasive infection, and classic Klebsiella pneumoniae (cKP), a very common organism associated with many kinds of nosocomial infection. Clinical information obtained from patients with both bacteremia and other body site infections caused by hvKP and/or cKP was retrospectively reviewed. Homo-hvKP (or homo-cKP) was defined as homologous hvKP (or cKP) strains from different body sites in each individual patient according to string test, virulence gene amplification and PFGE pattern. MLST was carried on to understand the correlation of sequence type with capsular polysaccharide type for Klebsiella pneumoniae from blood. Sixty-four hvKP and 101 cKP strains were isolated from blood and other body sites of 76 patients who had bacteremia accompanied by other site infection. Among these patients, 27 were infected with homo-hvKP, 32 were with homo-cKP, 12 were with heterogeneous cKP, and five were with both hvKP and cKP. Patients with bacteremia and liver abscesses caused by homo-hvKP accounted for 51.9%, and 92.6% of homo-hvKP infected patients did not receive any invasive procedures before bacteremia. However, patients with bacteremia and biliary tract infection caused by homo-cKP accounted for 34.4%, and 78.1% of homo-cKP infected patients had history of invasive procedures before bacteremia. More homo-hvKP strains (59.3%) than homo-cKP strains (34.4%) were isolated from blood earlier than other sites. HvKP strains were statistically more susceptible to the tested antimicrobials than cKP strains. An outbreak of carbapenem-resistant cKP infection and possible gene transfer of KPC-2 from cKP to hvKP were brought to notice. Both hvKP and cKP could cause bacteremia and other body site infection. But patients with hvKP bacteremia usually suffered from liver abscess without previous invasive procedures, most patients with c
Ye, Q F; Zhao, J; Wan, Q Q; Qiao, B B; Zhou, J D
Although bacteremias caused by the 6 ESKAPE pathogens (Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterobacter species) have recently been highlighted as a serious complication in solid organ transplant (SOT), more information is urgently needed. We sought to investigate the frequency and clinical outcomes of ESKAPE bacteremia in SOT and determine the risk factors for mortality. A retrospective analysis of bacteremia after SOT was reviewed. Risk factors for mortality caused by ESKAPE bacteremia were identified. Eighty-four episodes of bacteremia were caused by ESKAPE strains. Of these strains, 41 were caused by resistant ESKAPE (rESKAPE) organisms. The only factor for bacteremia-related mortality independently associated with ESKAPE was septic shock (odds ratio [OR] = 21.017, 95% confidence interval [CI] = 5.038-87.682, P < 0.001). The factors for bacteremia-related mortality independently associated with rESKAPE bacteremia were septic shock (OR = 16.558, 95% CI = 6.620-104.668, P = 0.003) and age ≥40 years (OR = 7.521, 95% CI = 1.196-47.292, P = 0.031). To improve the outcomes of transplantation, more effective therapeutic treatments are of paramount importance when older SOT recipients with bacteremia due to ESKAPE/rESKAPE organisms present with septic shock. © 2014 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.
Lüebbe, A S; Harris, P D; Garrison, R N
To test if anesthetic procedures change the hemodynamic pattern in animals with experimental septic shock. The effect of two anesthetics on systemic hemodynamic and skeletal muscle microcirculatory responses in high cardiac output live E. coli bacteremia was studied in rats and compared to the effect of two other anesthetic procedures in previously published studies. Baseline blood pressures and cardiac outputs were similar in rats with decerebrate, ketamine/xylazine, pentobarbital or urethane/chloralose anesthesia. There was a relative baseline tachycardia in decerebrate rats. Ketamine/xylazine anesthetized rats had reduced blood pressure, cardiac output, and heart rate. In decerebrate, pentobarbital, and urethane/chloralose anesthesia, cardiac output increased initially during bacteremia but did not remain elevated in pentobarbital anesthesia. Blood pressure and heart rate remained constant in pentobarbital, decerebrate, and urethane/chloralose anesth esia. During bacteremia, cardiac output, blood pressure, and vascular resistance did not change with ketamine/xylazine, but the heart rate increased. Baseline diameters of cremaster muscle large (A1) arterioles were higher in decerebrate anesthesia. A1 arterioles constricted during high cardiac output bacteremia in decerebrate rats, and pentobarbital or urethane/chloralose-anesthetized rats. A4 arterioles in bacteremia dilated in decerebrate and pentobarbital anesthesia, but did not change under urethane/chloralose and ketamine/xylazine anesthesia. Anesthetics influence baseline systemic variables and the response of systemic hemodynamics of rats to E. coli bacteremia. During bacteremia, anesthetics primarily affect the reactivity of skeletal muscle small arterioles. Ketamine/xylazine anesthesia has the most pronounced effect on systemic and microcirculatory variables and seems to be an inappropriate choice in sepsis experiments in rats.
Kang, Cheol-In; Song, Jae-Hoon; Chung, Doo Ryeon; Peck, Kyong Ran; Yeom, Joon-Sup; Son, Jun Seong; Wi, Yu Mi
The aim of this study was to more precisely delineate the characteristics and outcomes of bloodstream infections in adult cancer patients. Using a database for nationwide surveillance of bacteremia, we analyzed data related to bacteremia in adult patients with cancer in order to evaluate clinical features and outcomes and to define predictive factors for mortality. Of 1,246 patients, 896 (71.9%) had solid tumors, 328 (26.3%) had hematologic malignancies, and 22 (1.8%) had both. The following conditions were more common in the neutropenic group than in the non-neutropenic group: nosocomial acquisition, hematologic malignancy, corticosteroid use, immunosuppressant use, primary bacteremia, and pneumonia (all P < 0.05). The infections were caused by Gram-negative bacilli in 55.6% and by Gram-positive cocci in 32.7%. Gram-negative pathogens were more frequently isolated from neutropenic patients than from non-neutropenic patients (61.9% vs. 53.5%, P = 0.010), with a significant predominance of Escherichia coli and Klebsiella pneumoniae. Among 1,001 patients whose outcomes could be evaluated, the overall 30-day mortality rate was 24.1%, and multivariate analysis showed that Staphylococcus aureus bacteremia was a significant factor associated with mortality (odds ratio (OR), 1.80; 95% confidence interval (CI), 1.03-3.15), along with nosocomial acquisition, pneumonia, severe sepsis or septic shock, and higher Pitt bacteremia score (all P values <0.05). This study represents the comprehensive assessment of bloodstream infections in neutropenic versus non-neutropenic cancer patients. Given the pathogenic significance of S. aureus bacteremia in adult patients with cancer, additional strategies for the management of S. aureus bacteremia in cancer patients are needed to improve outcomes.
Wang, Tao; Cui, Yun-Liang; Lin, Zhao-Fen; Chen, De-Chang
Background: Both procalcitonin (PCT) and plasma endotoxin levels cannot be solely used for a definite diagnosis of bacteremia or sepsis, and there has been few study comparing the values of the two biomarkers for the diagnosis of bacteremia. The aim of this study was to identify bacteria causing bacteremia and evaluate the role of the two biomarkers in the diagnosis of bacteremia in Intensive Care Unit (ICU). Methods: The medical records of 420 patients in ICU were retrospectively reviewed. Patients (n = 241) who met the inclusion criteria were subjected to blood culture (BC) for the analysis of the endotoxin or PCT levels. The exclusion criteria included the presence of infection with human immunodeficiency virus and/or AIDS, neutropenia without sepsis, pregnancy, treatment with immunosuppressive therapies, or blood diseases such as hematological tumors. Patients’ BC episodes were divided into BC negative, Gram-negative (GN) bacteria, Gram-positive bacteria, and fungi groups. The PCT and plasma endotoxin levels were compared in the different groups. Results: A total of 241 patients with 505 episodes of BC were analyzed. The GN bacteria group showed higher levels of PCT and endotoxin than the BC negative, Gram-positive bacteria, and fungi groups. GN bacteremia was more prevalent than Gram-positive bacteremia. The GN bacteremia caused by non-Enterobacteriaceae infection presented higher endotoxin level than that by Enterobacteriaceae, but no significant difference in PCT levels was observed between the two groups. The plasma endotoxin significantly differed among different groups and was bacterial species dependent. Conclusions: Plasma endotoxin was more related to GN than to Gram-positive bacteremia, and that endotoxin level was species dependent, but PCT level remained relatively more stable within the GN bacteria caused bacteremia. Both GN and positive bacteria caused bacteremia in the ICU patients in different regions of China. And PCT is a more valuable
Wang, Tao; Cui, Yun-Liang; Lin, Zhao-Fen; Chen, De-Chang
Both procalcitonin (PCT) and plasma endotoxin levels cannot be solely used for a definite diagnosis of bacteremia or sepsis, and there has been few study comparing the values of the two biomarkers for the diagnosis of bacteremia. The aim of this study was to identify bacteria causing bacteremia and evaluate the role of the two biomarkers in the diagnosis of bacteremia in Intensive Care Unit (ICU). The medical records of 420 patients in ICU were retrospectively reviewed. Patients (n = 241) who met the inclusion criteria were subjected to blood culture (BC) for the analysis of the endotoxin or PCT levels. The exclusion criteria included the presence of infection with human immunodeficiency virus and/or AIDS, neutropenia without sepsis, pregnancy, treatment with immunosuppressive therapies, or blood diseases such as hematological tumors. Patients' BC episodes were divided into BC negative, Gram-negative (GN) bacteria, Gram-positive bacteria, and fungi groups. The PCT and plasma endotoxin levels were compared in the different groups. A total of 241 patients with 505 episodes of BC were analyzed. The GN bacteria group showed higher levels of PCT and endotoxin than the BC negative, Gram-positive bacteria, and fungi groups. GN bacteremia was more prevalent than Gram-positive bacteremia. The GN bacteremia caused by non-Enterobacteriaceae infection presented higher endotoxin level than that by Enterobacteriaceae, but no significant difference in PCT levels was observed between the two groups. The plasma endotoxin significantly differed among different groups and was bacterial species dependent. Plasma endotoxin was more related to GN than to Gram-positive bacteremia, and that endotoxin level was species dependent, but PCT level remained relatively more stable within the GN bacteria caused bacteremia. Both GN and positive bacteria caused bacteremia in the ICU patients in different regions of China. And PCT is a more valuable biomarker than endotoxin in the diagnosis of
Simplified risk stratification criteria for identification of patients with MRSA bacteremia at low risk of infective endocarditis: implications for avoiding routine transesophageal echocardiography in MRSA bacteremia.
Buitron de la Vega, P; Tandon, P; Qureshi, W; Nasr, Y; Jayaprakash, R; Arshad, S; Moreno, D; Jacobsen, G; Ananthasubramaniam, K; Ramesh, M; Zervos, M
The aim of this study was to identify patients with methicillin-resistant Staphylococcus aureus (MRSA) bacteremia with low risk of infective endocarditis (IE) who might not require routine trans-esophageal echocardiography (TEE). We retrospectively evaluated 398 patients presenting with MRSA bacteremia for the presence of the following clinical criteria: intravenous drug abuse (IVDA), long-term catheter, prolonged bacteremia, intra-cardiac device, prosthetic valve, hemodialysis dependency, vertebral/nonvertebral osteomyelitis, cardio-structural abnormality. IE was diagnosed using the modified Duke criteria. Of 398 patients with MRSA bacteremia, 26.4 % of cases were community-acquired, 56.3 % were health-care-associated, and 17.3 % were hospital-acquired. Of the group, 44 patients had definite IE, 119 had possible IE, and 235 had a rejected diagnosis. Out of 398 patients, 231 were evaluated with transthoracic echocardiography (TTE) or TEE. All 44 patients with definite IE fulfilled at least one criterion (sensitivity 100 %). Finally, a receiver operator characteristic (ROC) curve was obtained to evaluate the total risk score of our proposed criteria as a predictor of the presence of IE, and this was compared to the ROC curve of a previously proposed criteria. The area under the ROC curve for our criteria was 0.710, while the area under the ROC curve for the criteria previously proposed was 0.537 (p < 0.001). The p-value for comparing those 2 areas was less than 0.001, indicating statistical significance. Patients with MRSA bacteremia without any of our proposed clinical criteria have very low risk of developing IE and may not require routine TEE.
Tai, A. Y.; Kotsanas, D.; Francis, M. J.; Roberts, S. A.; Ballard, S. A.; Junckerstorff, R. K.; Korman, T. M.
Eggerthella lenta is an emerging pathogen that has been underrecognized due to historical difficulties with phenotypic identification. Until now, its pathogenicity, antimicrobial susceptibility profile, and optimal treatment have been poorly characterized. In this article, we report the largest cohort of patients with E. lenta bacteremia to date and describe in detail their clinical features, microbiologic characteristics, treatment, and outcomes. We identified 33 patients; the median age was 68 years, and there was no gender predominance. Twenty-seven patients (82%) had serious intra-abdominal pathology, often requiring a medical procedure. Of those who received antibiotics (28/33, 85%), the median duration of treatment was 21.5 days. Mortality from all causes was 6% at 7 days, 12% at 30 days, and 33% at 1 year. Of 26 isolates available for further testing, all were identified as E. lenta by both commercially available matrix-assisted laser desorption ionization–time of flight mass spectrometry (MALDI-TOF MS) systems, and none were found to harbor a vanA or vanB gene. Of 23 isolates which underwent susceptibility testing, all were susceptible to amoxicillin-clavulanate, cefoxitin, metronidazole, piperacillin-tazobactam, ertapenem, and meropenem, 91% were susceptible to clindamycin, 74% were susceptible to moxifloxacin, and 39% were susceptible to penicillin. PMID:25520446
You, Myung-Jo; Shin, Gee-Wook; Lee, Chang-Seop
Clostridium tertium is distributed in the soil and in animal and human gastrointestinal tracts. C. tertium has been isolated from patients with blood diseases, immune disorders, and abdominal surgeries. Glyphosate is toxic, causing cause eye and skin irritation, gastrointestinal pain, and vomiting. Ingestion of herbicides modiﬁes the gastrointestinal environment, which stresses the living organisms. However, there has been little attention to cases of bacteremia in patients recovering from suicide attempt by ingesting herbicide. Clostridium tertium was identified in a 44-year-old female who attempted suicide by glyphosate (a herbicide) ingestion. The 16S rRNA sequences from all colonies were 99% identical with that of C. tertium (AB618789) found on a BLAST search of the NCBI database. The bacterium was cultured on TSA under aerobic and anaerobic conditions. Antimicrobial susceptibility tests performed under both aerobic and anaerobic conditions showed that the bacterium was susceptible to penicillin, a combination of β-lactamase inhibitor and piperacillin or amoxicillin, and first- and second- generation cephalosporins. However, it was resistant to third- and fourth-generation cephalosporins. Glyphosate herbicide might be a predisposing factor responsible for the pathogenesis of C. tertium. The results highlight the need for careful diagnosis and selection of antibiotics in the treatment of this organism.
Shoai Tehrani, M; Hajage, D; Fihman, V; Tankovic, J; Cau, S; Day, N; Visseaux, C; Carbonnelle, E; Kouatchet, A; Cattoir, V; Nhan, T X; Corvec, S; Jacquier, H; Jauréguy, F; Le Monnier, A; Morand, P; Zahar, J R
Given the increasing frequency of cefotaxime-resistant strains, third-generation cephalosporins (3GC e.g. cefotaxime, ceftriaxone) might not be recommended any longer as empirical antibiotic therapy for community-acquired Gram-negative bacteremia (CA-GNB). We conducted a multicenter prospective descriptive study including patients with CA-GNB. Two hundred and nineteen patients were included. Escherichia coli and Pseudomonas aeruginosa were the most frequently isolated species in 63% (n=138) and 11% (n=24) of the cases, respectively. The prevalence of cefotaxime-resistance reached 18% (n=39) mostly due to intrinsic resistance (27 cases, 12%). The presence of invasive material (P<0.001), the origin of the patient (Paris region or West of France) (P=0.006), and home health care (P<0.001) were variables predicting resistant GNB. The negative predictive value for resistance in patients with invasive material coming from the West of France, or without invasive material and with home health care was 94%. The positive predictive value for patients with invasive material living in Paris, or without invasive material and with home health care only reached 58 and 54%, respectively. Using 3GC for CA-GNB due to cefotaxime-resistant strains was relatively frequent, ESBL-producing Enterobacteriaceae being rarely involved. Our study highlights the role of local epidemiology; before any changes to first-line antibiotic therapy, local epidemiological data should be taken into account. Copyright © 2014 Elsevier Masson SAS. All rights reserved.
Gürol, Gölnül; Çiftci, İhsan Hakki; Terizi, Huseyin Agah; Atasoy, Ali Rıza; Ozbek, Ahmet; Köroğlu, Mehmet
Bacteremia and sepsis are common causes of morbidity and mortality worldwide, with incorrect or delayed diagnoses being associated with increased mortality. New tests or markers that allow a more rapid and less costly detection of bacteremia and sepsis have been investigated. The aim of this study was to clarify the cutoff value of the neutrophillymphocyte ratio (NLR) according to procalcitonin (PCT) level in the decision-making processes for bacteremia and sepsis. In addition, other white blood cell subgroup parameters, which are assessed in all hospitals, for bacteremia and sepsis were explored. This retrospective study included 1,468 patients with suspected bacteremia and sepsis. Patients were grouped according to the following PCT criteria: levels <0.05 ng/ml (healthy group), 0.05-0.5 ng/ml (local infection group), 0.5-2 ng/ml (systemic infection group), 2-10 ng/ml (sepsis group), and >10 ng/ml (sepsis shock group). One important finding of this study, which will serve as a baseline to measure future progress, is the presence of many gaps in the information on pathogens that constitute a major health risk. In addition, clinical decisions are generally not coordinated, compromising the ability to assess and monitor a situation. This report represents the first study to determine the limits of the use of NLR in the diagnosis of infection or sepsis using a cutoff value of <5 when sufficient exclusion criteria are used.
Komatsu, Takayuki; Onda, Toshihito; Murayama, Go; Yamanouchi, Masashi; Inukai, Minori; Sakai, Ai; Kikuta, Masumi; Branch, Joel; Aoki, Makoto; Tierney, Lawrence M; Inoue, Kenji
Bacteremia and its complications are important causes of morbidity and mortality in hospitalized patients. However, the yield of blood cultures is relatively low, with many false-positive results from bacterial contamination. We investigated the relationship between patient food consumption and the presence of bacteremia. This was an observational analysis of a cohort of 1179 patients who underwent blood culture analysis between January 2005 and December 2009. Patients with anorexia-inducing conditions, such as gastrointestinal illness and malignant disease treated with chemotherapy, were excluded. Food consumption was rated by nurses as the percentage of food consumed during the meal preceding the blood culture. Groupings were as follows: low consumption (<50%), moderate (>50% to <80%), and high (>80%). Low consumption was observed in 39.8% of patients, moderate in 17.8%, and high in 41.6%. The average body temperature was 38.1 ± 1.1°C. Bacteremia was present in 18.5%, 3.9%, and 1.4% of patients in the low, moderate, and high food consumption groups, respectively. The negative predictive value was 98.3%, suggesting that bacteremia is very unlikely in the setting of good food intake. Bacteremia is an unlikely occurrence in hospitalized patients who maintain adequate food consumption at the time of blood culture. Copyright © 2012 Society of Hospital Medicine.
Park, Hyun; Jang, Ki Jun; Jang, Won; Park, Sang Hoon; Park, Ji Young; Jeon, Tae Joo; Oh, Tae Hoon; Shin, Won Chang; Choi, Won-Choong; Sinn, Dong Hyun
AIM: To analyze whether prompt and appropriate empirical antibiotic (AEA) use is associated with mortality in cirrhotic patients with bacteremia. METHODS: A total of 102 episodes of bacteremia in 72 patients with cirrhosis were analyzed. AEA was defined as a using or starting an antibiotic appropriate to the isolated pathogen at the time of bacteremia. The primary endpoint was 30-d mortality. RESULTS: The mortality rate at 30 d was 30.4% (31/102 episodes). Use of AEA was associated with better survival at 30 d (76.5% vs 46.9%, P = 0.05), and inappropriate empirical antibiotic (IEA) use was an independent factor associated with increased mortality (OR = 3.24; 95%CI: 1.50-7.00; P = 0.003, adjusted for age, sex, Child-Pugh Class, gastrointestinal bleeding, presence of septic shock). IEA use was more frequent when the isolated pathogen was a multiresistant pathogen, and when infection was healthcare-related or hospital-acquired. CONCLUSION: AEA use was associated with increased survival of cirrhotic patients who developed bacteremia. Strategies for AEA use, tailored according to the local epidemiological patterns, are needed to improve survival of cirrhotic patients with bacteremia. PMID:25834324
Calderwood, Michael S.; Desjardins, Christopher A.; Sakoulas, George; Nicol, Robert; DuBois, Andrea; Delaney, Mary L.; Kleinman, Ken; Cosimi, Lisa A.; Feldgarden, Michael; Onderdonk, Andrew B.; Birren, Bruce W.; Platt, Richard; Huang, Susan S.
Background. Methicillin-resistant Staphylococcus aureus (MRSA) colonization predicts later infection, with both host and pathogen determinants of invasive disease. Methods. This nested case-control study evaluates predictors of MRSA bacteremia in an 8–intensive care unit (ICU) prospective adult cohort from 1 September 2003 through 30 April 2005 with active MRSA surveillance and collection of ICU, post-ICU, and readmission MRSA isolates. We selected MRSA carriers who did (cases) and those who did not (controls) develop MRSA bacteremia. Generating assembled genome sequences, we evaluated 30 MRSA genes potentially associated with virulence and invasion. Using multivariable Cox proportional hazards regression, we assessed the association of these genes with MRSA bacteremia, controlling for host risk factors. Results. We collected 1578 MRSA isolates from 520 patients. We analyzed host and pathogen factors for 33 cases and 121 controls. Predictors of MRSA bacteremia included a diagnosis of cancer, presence of a central venous catheter, hyperglycemia (glucose level, >200 mg/dL), and infection with a MRSA strain carrying the gene for staphylococcal enterotoxin P (sep). Receipt of an anti-MRSA medication had a significant protective effect. Conclusions. In an analysis controlling for host factors, colonization with MRSA carrying sep increased the risk of MRSA bacteremia. Identification of risk-adjusted genetic determinants of virulence may help to improve prediction of invasive disease and suggest new targets for therapeutic intervention. PMID:24041793
Lee, Meng-Rui; Huang, Yu-Tsung; Liao, Chun-Hsing; Chuang, Tzu-Yi; Wang, Wei-Jie; Lee, Shih-Wei; Lee, Li-Na; Hsueh, Po-Ren
We describe 16 patients with bacteremia caused by Eggerthella lenta (n = 7), Paraeggerthella hongkongensis (n = 3), Eubacterium limosum (n = 4), Eubacterium callanderi (n = 1), and concomitant Eubacterium limosum/Eggerthella lenta (n = 1). Nine (56%) patients had polymicrobial bacteremia. The overall 60-day mortality rate was 19%, and all deaths occurred in patients with E. lenta bacteremia.
Bonacorsi, Stéphane; Houdouin, Véronique; Mariani-Kurkdjian, Patricia; Mahjoub-Messai, Farah; Bingen, Edouard
Escherichia coli isolates causing urinary tract infection in 83 male infants younger than 90 days with and without bacteremia were compared for phylogenetic groups and the presence of 10 virulence factors. Our result suggest that the absence of both hemolysin and antigen K1 may be used as a negative predictive factor for bacteremia. PMID:16517919
Suwantarat, Nuntra; Adams, La'Tonzia L; Romagnoli, Mark; Carroll, Karen C
Herbaspirillum spp. are rare causes of human infections associated primarily with bacteremia in cancer patients. We report the first fatal case of bacteremia secondary to pneumonia caused by Herbaspirillum seropedicae in a 65-year-old man with end-stage renal disease and multiple myeloma. Copyright © 2015 Elsevier Inc. All rights reserved.
Song, Eun Hee; Park, Ki-Ho; Jang, Eun-Young; Lee, Eun Jung; Chong, Yong Pil; Cho, Oh-Hyun; Kim, Sung-Han; Lee, Sang-Oh; Sung, Heungsup; Kim, Mi-Na; Jeong, Jin-Yong; Kim, Yang Soo; Woo, Jun Hee; Choi, Sang-Ho
We compared the characteristics and outcomes of 172 Enterobacter cloacae bacteremia and 67 Enterobacter aerogenes bacteremia (EAB) cases. Antimicrobial resistance rates to E. cloacae were higher than those to E. aerogenes. However, EAB more frequently presented as septic shock and was associated with poorer outcomes.
Maggi, Ricardo G.; Mozayeni, B. Robert; Pultorak, Elizabeth L.; Hegarty, Barbara C.; Bradley, Julie M.; Correa, Maria
Bartonella spp. infection has been reported in association with an expanding spectrum of symptoms and lesions. Among 296 patients examined by a rheumatologist, prevalence of antibodies against Bartonella henselae, B. koehlerae, or B. vinsonii subsp. berkhoffii (185 [62%]) and Bartonella spp. bacteremia (122 [41.1%]) was high. Conditions diagnosed before referral included Lyme disease (46.6%), arthralgia/arthritis (20.6%), chronic fatigue (19.6%), and fibromyalgia (6.1%). B. henselae bacteremia was significantly associated with prior referral to a neurologist, most often for blurred vision, subcortical neurologic deficits, or numbness in the extremities, whereas B. koehlerae bacteremia was associated with examination by an infectious disease physician. This cross-sectional study cannot establish a causal link between Bartonella spp. infection and the high frequency of neurologic symptoms, myalgia, joint pain, or progressive arthropathy in this population; however, the contribution of Bartonella spp. infection, if any, to these symptoms should be systematically investigated. PMID:22516098
Jimeno-Almazán, Amaya; Viqueira-Gonzalez, Montserrat; Alcalde, María Del Mar; Alcaraz-Vidal, Begoña; Vera-Méndez, Francisco
A gradual increase in severe cases due to Streptococcus pyogenes or Streptococcus beta-hemolytic group A (SGA), has been detected in the last few decades. Retrospective study of bacteremia due to S.pyogenes detected between January 2009 and January 2013 in Cartagena. The annual incidence for severe bacteremia has been estimated. Thirteen cases of SGA bacteremia were recorded. The incidence increased from 0.37 in 2009 to 2.5 cases/100,000 inhabitants in 2012. The predominant focus was skin and soft tissue infections (53%). Early mortality was 20%. Severe streptococcal disease is rare, but affects individuals with good functional status, and is associated with a high mortality. Copyright © 2012 Elsevier España, S.L. All rights reserved.
Watanakunakorn, C; Baird, I M
Records of 21 patients with Staphylococcus aureus bacteremia associated with a removable infected intravenous device were reviewed. Sixteen patients had a peripheral intravenous catheter, four had a central venous catheter and one had a transvenous cardiac pacer. The duration of the indwelling intravenous device in situ prior to the detection of infection ranged from two to 11 (mean 5.2) days. The infected intravenous device was promptly removed as soon as bacteremia was suspected. Endocarditis was diagnosed in eight patients: in two patients an aortic murmur developed; in two the diagnosis was made clinically and was confirmed at necropsy (one mitral and one aortic); in four the diagnosis was made at necropsy (two tricuspid and two atrial wall). In patients with Staph. aureus bacteremia associated with a removable infected intravenous device, the risk of endocarditis developing was significant.
Sinclair, D.; Svendsen, A.; Marrie, T.
OBJECTIVE: To measure the prevalence of bacteremia and any correlation between signs and symptoms, risk factors, and laboratory data in elderly patients. DESIGN: Prospective analysis. All patients were contacted by the study nurse at 48 hours and 7 days after study entry. SETTING: Adult tertiary care hospital with an emergency department managing 48,000 visits yearly in a metropolitan area of 250,000. PARTICIPANTS: Members of the study population referred to the emergency department for medical or surgical problems. Of 113 nursing home patients, blood culture results were available for 111. MAIN OUTCOME MEASURES: Blood cultures were obtained by standard protocol. Demographic and medical information was collected from the medical record. Three groups of patients were compared with respect to symptoms, risk factors, laboratory data, and outcome. RESULTS: Group 1 (n = 86) had two sets of negative blood cultures. Group 2 (n = 10) had true-positive cultures. Group 3 (n = 15) had false-positive cultures of Staphylococcus epidermidis. The prevalence of bacteremia was 9.8% in the study population. No risk factors were predictive of bacteremia. Great variation in signs and symptoms were noted in all three groups, none correlating with bacteremia. Although seven of the 10 patients with positive cultures were febrile, this association did not reach statistical significance. All groups had high admission (> 50%) and mortality (20% to 37%) rates. CONCLUSIONS: The prevalence of bacteremia in the nursing home population presenting to the emergency department was 9.8%. The symptoms and signs of bacteremia in this population were variable and nonspecific. The high rate of false-positive cultures in this setting is of concern. PMID:9512835
Aoki, Yoshihiro; Kitazawa, Katsuhiko; Kobayashi, Hironobu; Senda, Masayoshi; Arahata, Yukie; Homma, Riu; Watanabe, Yudai; Honda, Akihito
Nontyphoidal Salmonella (NTS) can cause bacterial enterocolitis. Although some children with NTS infection develop bacteremia, its clinical manifestations have not been discussed adequately. Therefore, we examined children with NTS bacteremia. We retrospectively examined the medical records of 15 patients aged less than 15 years. Salmonella spp. were detected in the blood cultures of these patients between 1991 and 2014. We divided an additional sample group of 34 patients diagnosed with an NTS infection between 2005 and 2014, into 2 groups. Group bacteremia (B) included patients in whose blood cultures Salmonella spp. were detected, and group non-bacteremia (NB) included patients in whom Salmonella infection was not detected. We compared each group using Wilcoxon test and Fisher's exact test. The number of patients with fever, diarrhea, or abdominal pain was 15 (100%), 13 (87%), and 9 (60%), respectively, in the first sample of patients. However, vomiting and bloody stool were observed in only 5 patients (33%). More than 70% of patients exhibited a reduced white blood cell count, while C-reactive protein levels were variable in the patients. Salmonella spp. were detected via stool culture in 10 patients (67%). Diarrhea persisted for more than 4 days more frequently in group B than group NB (p = 0.004). The number of patients whose fever persisted for more than 4 days was significantly higher in group B than group NB (p = 0.030). Therefore, if NTS bacteremia is suspected, blood cultures should be collected and antibiotics should be initiated in cases with diarrhea or fever for more than 4 days. Furthermore, a negative stool culture result does not preclude the possibility of NTS bacteremia.
Cheng, Aristine; Liu, Chia-Ying; Tsai, Hsih-Yeh; Hsu, Meng-Shuian; Yang, Chia-Jui; Huang, Yu-Tsung; Liao, Chun-Hsing; Hsueh, Po-Ren
There are only three case reports of adult patients with spontaneous Pantoea agglomerans bacteremia in the English literature. The aim of this study was to investigate clinical and microbiologic characteristics patients of P agglomerans bacteremia. We studied all adult patients with P agglomerans bacteremia at a medical center from 2000 to 2010. The isolates were identified using two commercial identification systems. Of the 18 patients identified, 72% (n = 13) had active gastroesophageal disease treated with antacids. Two-thirds of patients had indwelling central lines and advanced cancers. None of the removed catheter tips yielded P agglomerans and line persistence was not associated with adverse outcomes. Initial disease severity was low, hypotension was uncommon and no patient died of bacteremia. Recurrence of bacteremia occurred in one patient with deep-seated infection. 16srRNA gene sequencing identified only half of the isolates as P agglomerans. The remaining nine isolates were Enterobacter species for six, Pantoea ananatis for two, and Exiguobacterium profundum for one. There were no significant differences between the characteristics of the subgroup molecularly identified as P agglomernas and the overall group characteristics. Eleven (61%) of the 18 isolates were susceptible to cefazolin, six (33%) susceptible to fosfomycin (MIC ≤ 64 mg/ml). Two isolates had colistin MICs ≥ 4 mg/ml. Bacteremia caused by P agglomerans is associated with gastroesophageal reflux disease and receipt of antacids. 16srRNA gene sequencing should not be used as the sole basis for its identification and we have highlighted the need for another molecular-based technique to conclusively characterize P agglomerans. Copyright © 2012. Published by Elsevier B.V.
Aroutcheva, Alla; Auclair, Julie; Frappier, Martin; Millette, Mathieu; Lolans, Karen; de Montigny, Danielle; Carrière, Serge; Sokalski, Stephen; Trick, William E; Weinstein, Robert A
There has been an increasing interest in the use of probiotic products for the prevention of Clostridium difficile infection (CDI). Bio-K+(®) is a commercial probiotic product comprising three strains of lactobacilli--Lactobacillus acidophilus CL1285(®), Lact. casei LBC80R(®) and Lact. rhamnosus CLR2(®)--that have been applied to prevent CDI. Generally considered as safe, lactobacilli have potential to cause bacteremia, endocarditis and other infections. The source of Lactobacillus bacteremia can be normal human flora or lactobacilli-containing probiotic. The aim of this study was to assess whether probiotic lactobacilli caused bacteremia and to show the value of molecular identification and typing techniques to determine probiotic and patient strain relatedness. We report an episode of Lactobacillus bacteremia in a 69-year-old man admitted to a hospital with severe congestive heart failure. During his hospitalization, he required long-term antibiotic therapy. Additionally, the patient received Bio-K+(®) probiotic as part of a quality improvement project to prevent CDI. Subsequently, Lactobacillus bacteremia occurred. Two independent blinded laboratory evaluations, using pulse field gel electrophoresis, 16S rRNA gene sequencing and DNA fingerprint analysis (rep-PCR), were performed to determine whether the recovered Lact. acidophilus originated from the probiotic product. Ultimately, the patient strain was identified as Lact. casei and both laboratories found no genetic relation between the patient's strain and any of the probiotic lactobacilli. This clinical case of lactobacillus bacteremia in the setting of probiotic exposure demonstrates the value of using discriminatory molecular methods to clearly determine whether there were a link between the patient's isolate and the probiotic strains.
Miller, Sinead E.; Bell, Charleson S.; Cover, Timothy L.; Giorgio, Todd D.
The rise of multi-drug resistance has decreased the effectiveness of antibiotics, which has led to increased mortality rates associated with symptomatic bacteremia, or bacterial sepsis. To combat decreasing antibiotic effectiveness, extracorporeal bacterial separation approaches have been proposed to capture and separate bacteria from blood. However, bacteremia is dynamic and involves host-pathogen interactions across various anatomical sites. We developed a mathematical model that quantitatively describes the kinetics of pathogenesis and progression of symptomatic bacteremia under various conditions, including bacterial separation therapy, to better understand disease mechanisms and quantitatively assess the biological impact of bacterial separation therapy. Model validity was tested against experimental data from published studies. This is the first multi-compartment model of symptomatic bacteremia in mammals that includes extracorporeal bacterial separation and antibiotic treatment, separately and in combination. The addition of an extracorporeal bacterial separation circuit reduced the predicted time of total bacteria clearance from the blood of an immunocompromised rodent by 49%, compared to antibiotic treatment alone. Implementation of bacterial separation therapy resulted in predicted multi-drug resistant bacterial clearance from the blood of a human in 97% less time than antibiotic treatment alone. The model also proposes a quantitative correlation between time-dependent bacterial load among tissues and bacteremia severity, analogous to the well-known ‘area under the curve’ for characterization of drug efficacy. The engineering-based mathematical model developed may be useful for informing the design of extracorporeal bacterial separation devices. This work enables the quantitative identification of the characteristics required of an extracorporeal bacteria separation device to provide biological benefit. These devices will potentially decrease the
Miller, Sinead E; Bell, Charleson S; McClain, Mark S; Cover, Timothy L; Giorgio, Todd D
The rise of multi-drug resistance has decreased the effectiveness of antibiotics, which has led to increased mortality rates associated with symptomatic bacteremia, or bacterial sepsis. To combat decreasing antibiotic effectiveness, extracorporeal bacterial separation approaches have been proposed to capture and separate bacteria from blood. However, bacteremia is dynamic and involves host-pathogen interactions across various anatomical sites. We developed a mathematical model that quantitatively describes the kinetics of pathogenesis and progression of symptomatic bacteremia under various conditions, including bacterial separation therapy, to better understand disease mechanisms and quantitatively assess the biological impact of bacterial separation therapy. Model validity was tested against experimental data from published studies. This is the first multi-compartment model of symptomatic bacteremia in mammals that includes extracorporeal bacterial separation and antibiotic treatment, separately and in combination. The addition of an extracorporeal bacterial separation circuit reduced the predicted time of total bacteria clearance from the blood of an immunocompromised rodent by 49%, compared to antibiotic treatment alone. Implementation of bacterial separation therapy resulted in predicted multi-drug resistant bacterial clearance from the blood of a human in 97% less time than antibiotic treatment alone. The model also proposes a quantitative correlation between time-dependent bacterial load among tissues and bacteremia severity, analogous to the well-known 'area under the curve' for characterization of drug efficacy. The engineering-based mathematical model developed may be useful for informing the design of extracorporeal bacterial separation devices. This work enables the quantitative identification of the characteristics required of an extracorporeal bacteria separation device to provide biological benefit. These devices will potentially decrease the
Lücking, Vibeke; Rosthøj, Steen
The purpose was to identify risk factors for bacteremia in febrile episodes occurring during chemotherapy for acute lymphoblastic leukemia (ALL) in children, and to develop a risk score permitting risk-adapted antibiotic therapy. We reviewed a total of 172 febrile episodes occurring during chemotherapy in 31 children and adolescents with ALL. Temperature, hematological parameters, culture findings, and antibiotic therapy were recorded. Bacteremias were classified as transmucosal or CVC-dependent. Blood cultures were positive with mucosal pathogens in 15 cases (9%) and with skin/environmental bacteria in 34 (20%). CVC-dependent infections occurred throughout the treatment phases, while transmucosal primarily during induction therapy. Transmucosal bacteremia was associated with induction therapy, leukocyte count ≤0.5 × 10(9)/L, neutrophil count ≤0.1 × 10(9)/L, monocyte count ≤0.01 × 10(9)/L, and platelet count ≤50 × 10(9)/L. Based on logistic conversion of the odds ratios for the five factors, a weight of 2 was assigned to induction therapy and leukocyte count ≤0.5 × 10(9)/L, and a weight of 1 to the remaining three parameters. The weights were included in a simple additive score ranging from 0 to 7, which defined groups with 4%, 6%, 24%, and 40% risk of transmucosal bacteremia. CVC-dependent bacteremia was not associated with markers of poor bone marrow function. In conclusion, transmucosal bacteremia in children with ALL is related to infiltration or suppression of the bone marrow. A score reflecting the condition of the marrow can define low-risk and high-risk groups and may prove clinically useful.
Tsai, Wan-Lin; Hung, Chih-Hsin; Chen, Hui-An; Wang, Jiun-Ling; Huang, I-Fei; Chiou, Yee-Hsuan; Chen, Yao-Shen; Lee, Susan Shin-Jung; Hung, Wan-Yu; Cheng, Ming-Fang
The prevalence of extended-spectrum β-lactamase (ESBL)-producing Escherichia coli is increasing worldwide. This study investigated the clinical features and bacteriology of pediatric patients with ESBL-producing E. coli bacteremia and compared their characteristics with those of adult patients. Clinical and laboratory data from all of the 41 patients aged ≤18 years diagnosed with E. coli bacteremia were collected over 5 years. Patients aged >18 years diagnosed with E. coli bacteremia, matched 1:1 for calendar time, were enrolled as the adult group. All E. coli isolates were tested for their blaCTX-M group and sequence type 131 (ST131). A novel seven-single nucleotide polymorphism-based clonotyping test was applied to detect the septatypes of each isolate. In the adult group, patients with ESBL-producing E. coli bacteremia had more previous hospitalizations and antimicrobial agent use than did those with non-ESBL-producing E. coli bacteremia, but these differences were not found in pediatric group. In the pediatric group, the proportion of isolates producing CTX-M group 9 was higher than that in the adult group (85.7% vs. 42.9%; p < 0.05). Among both groups, there were more E. coli ST131 in ESBL isolates in than there were non-ESBL isolates. The distribution of septatypes was more homogenous in ESBL-producing E. coli among the pediatric patients than among the adult patients. ST131 was the major clone causing E. coli bacteremia in both pediatric and adult populations. The pediatric population demonstrated a higher number of isolates producing CTX-M group 9 with more homogenous septatypes compared with the adult population. Copyright © 2017. Published by Elsevier B.V.
Falguera, Miquel; Trujillano, Javier; Caro, Sílvia; Menéndez, Rosario; Carratalà, Jordi; Ruiz-González, Agustín; Vilà, Manuel; García, Mercè; Porcel, José Manuel; Torres, Antoni
We endeavored to construct a simple score based entirely on epidemiological and clinical variables that would stratify patients who require hospital admission because of community-acquired pneumonia into groups with a low or high risk of developing bacteremia. Derivation and internal validation cohorts were obtained by retrospective analysis of a database that included 3116 consecutive patients with community-acquired pneumonia from 2 university hospitals. Potential predictive factors were determined by means of a multivariate logistic regression equation applied to a cohort consisting of 60% of the patients. Points were assigned to significant parameters to generate the score. It was then internally validated with the remaining 40% of patients and was externally validated using an independent multicenter cohort of 1369 patients. The overall rates of bacteremia were 12%-16% in the cohorts. The clinical probability estimate of developing bacteremia was based on 6 variables: liver disease, pleuritic pain, tachycardia, tachypnea, systolic hypotension, and absence of prior antibiotic treatment. For the score, 1 point was assigned to each predictive factor. In the derivation cohort, a cutoff score of 2 best identified the risk of bacteremia. In the validation cohorts, rates of bacteremia were <8% for patients with a score 1 (43%-49% of patients), whereas blood culture results were positive in 14%-63% of cases for patients with a score 2. This clinical score, based on readily available and objective variables, provides a useful tool to predict bacteremia. The score has been internally and externally validated and may be useful to guide diagnostic decisions for community-acquired pneumonia.
Greenhow, Tara L; Hung, Yun-Yi; Herz, Arnd
In June 2010, Kaiser Permanente Northern California replaced all 7-valent pneumococcal conjugate vaccine (PCV7) vaccines with the 13-valent pneumococcal conjugate vaccine (PCV13). Our objectives were to compare the incidence of bacteremia in children 3 to 36 months old by 3 time periods: pre-PCV7, post-PCV7/pre-PCV13, and post-PCV13. We designed a retrospective review of the electronic medical records of all blood cultures collected on children 3 to 36 months old at Kaiser Permanente Northern California from September 1, 1998 to August 31, 2014 in outpatient clinics, in emergency departments, and in the first 24 hours of hospitalization. During the study period, 57 733 blood cultures were collected in the population of children 3 to 36 months old. Implementation of routine immunization with the pneumococcal conjugate vaccine resulted in a 95.3% reduction of Streptococcus pneumoniae bacteremia, decreasing from 74.5 to 10 to 3.5 per 100 000 children per year by the post-PCV13 period. As pneumococcal rates decreased, Escherichia coli, Salmonella spp, and Staphylococcus aureus caused 77% of bacteremia. Seventy-six percent of all bacteremia in the post-PCV13 period occurred with a source. In the United States, routine immunizations have made bacteremia in the previously healthy toddler a rare event. As the incidence of pneumococcal bacteremia has decreased, E coli, Salmonella spp, and S aureus have increased in relative importance. New guidelines are needed to approach the previously healthy febrile toddler in the outpatient setting. Copyright © 2017 by the American Academy of Pediatrics.
Peterson, William J.; Maya, Ivan D.; Carlton, Donna; Estrada, Erin; Allon, Michael
Background Catheter-related bacteremia (CRB) is a frequent complication of tunneled dialysis catheters, and Enterococcus is a common infecting organism. CRB may be treated by instilling an antibiotic lock into the catheter lumen, in conjunction with systemic antibiotics. The efficacy of this approach in Enterococcus bacteremia is unknown. Design Quality improvement report. Setting and participants 64 catheter-dependent hemodialysis outpatients with vancomycin-sensitive Enterococcus bacteremia treated with a uniform antibiotic lock protocol. Clinical outcomes were tracked prospectively. Quality improvement plans Patients received intravenous vancomycin for 3 weeks, in conjunction with a vancomycin lock instilled into both catheter lumens after each dialysis session. Measures Treatment failure was defined as persistent fever 48 hours after initiation of antibiotics or recurrent Enterococcus bacteremia within 90 days. A clinical cure was defined as fever resolution without recurrent bacteremia. Major infection-related complications within 6 months were documented. Results Treatment failure occurred in 25 patients (39%), due to persistent fever in 10, and recurrent bacteremia in 15. Treatment success occurred in 39 patients (61%). A serious complication of Enterococcus CRB occurred in 4 of 64 patients (6%), endocarditis in 1 and osteomyelitis in 3. The frequency of serious complications was 16% (4/25) in patients with treatment failure, as compared with 0% (0/39) in those with treatment success (P=0.01). Limitations This was a single-center study. We did not measure serum vancomycin levels. Conclusions An antibiotic lock protocol permits catheter salvage in 61% of hemodialysis patients with Enterococcus CRB. Serious complications occur in 6% of patients, and are more common in those with treatment failure. PMID:18848379
Prematunge, Chatura; MacDougall, Colin; Johnstone, Jennie; Adomako, Kwaku; Lam, Freda; Robertson, Jennifer; Garber, Gary
BACKGROUND Prior data suggest that vancomycin-resistant Enterococcus (VRE) bacteremia is associated with worse outcomes than vancomycin-sensitive Enterococcus (VSE) bacteremia. However, many studies evaluating such outcomes were conducted prior to the availability of effective VRE therapies. OBJECTIVE To systematically review VRE and VSE bacteremia outcomes among hospital patients in the era of effective VRE therapy. METHODS Electronic databases and grey literature published between January 1997 and December 2014 were searched to identify all primary research studies comparing outcomes of VRE and VSE bacteremias among hospital patients, following the availability of effective VRE therapies. The primary outcome was all-cause, in-hospital mortality, while total hospital length of stay (LOS) was a secondary outcome. All meta-analyses were conducted in Review Manager 5.3 using random-effects, inverse variance modeling. RESULTS Among all the studies reviewed, 12 cohort studies and 1 case control study met inclusion criteria. Similar study designs were combined in meta-analyses for mortality and LOS. VRE bacteremia was associated with increased mortality compared with VSE bacteremia among cohort studies (odds ratio [OR], 1.80; 95% confidence interval [CI], 1.38-2.35; I2=0%; n=11); the case-control study estimate was similar, but not significant (OR, 1.93; 95% CI, 0.97-3.82). LOS was greater for VRE bacteremia patients than for VSE bacteremia patients (mean difference, 5.01 days; 95% CI, 0.58-9.44]; I2=0%; n=5). CONCLUSIONS Despite the availability of effective VRE therapy, VRE bacteremia remains associated with an increased risk of in-hospital mortality and LOS when compared to VSE bacteremia. Infect. Control Hosp. Epidemiol. 2015;37(1):26-35.
Lipsky, Benjamin A; Kollef, Marin H; Miller, Loren G; Sun, Xiaowu; Johannes, Richard S; Tabak, Ying P
Bacteremia is relatively common in patients with skin and skin-structure infection (SSSI) severe enough to require hospitalization. We used selected demographic and clinical characteristics easily assessable at initial evaluation to develop a model for the early identification of patients with SSSI who are at higher risk for bacteremia. A large database of adults hospitalized with SSSI at 97 hospitals in the United States during the period from 2003 through 2007 and from whom blood samples were obtained for culture at admission. We compared selected candidate predictor variables for patients shown to have bacteremia and patients with no demonstrated bacteremia. Using stepwise logistic regression to identify independent risk factors for bacteremia, we derived a model by using 75% of a randomly split cohort, converted the model coefficients into a risk score system, and then we validated it by using the remaining 25% of the cohort. Bacteremia was documented in 1,021 (11.7%) of the 8,747 eligible patients. Independent predictors of bacteremia (P<.001) were infected device or prosthesis, respiratory rate less than 10 or more than 29 breaths per minute, pulse rate less than 49 or more than 125 beats per minute, temperature less than 35.6 degrees C or at least 38.0 degrees C, white blood cell band percentage of 7% or more, white blood cell count greater than 11x10(9)/L, healthcare-associated infection, male sex, and older age. The bacteremia rates ranged from 3.7% (lowest decile) to 30.6% (highest decile) (P<.001). The model C statistic was 0.71; the Hosmer-Lemeshow test P value was .36, indicating excellent model calibration. Using data available at hospital admission, we developed a risk score that differentiated SSSI patients at low risk for bacteremia from patients at high risk. This score may help clinicians identify patients who require more intensive monitoring or antimicrobial regimens appropriate for treating bacteremia.
Ku, Nam Su; Kim, Hye-Won; Oh, Hyung Jung; Kim, Yong Chan; Kim, Min Hyung; Song, Je Eun; Oh, Dong Hyun; Ahn, Jin Young; Kim, Sun Bean; Jeong, Su Jin; Han, Sang Hoon; Kim, Chang Oh; Song, Young Goo; Kim, June Myung; Choi, Jun Yong
Red blood cell distribution width (RDW) is known to be a predictor of severe morbidity and mortality in some chronic diseases such as congestive heart failure. However, to our knowledge, little is known about RDW as a predictor of mortality in patients with Gram-negative bacteremia, a major nosocomial cause of intra-abdominal infections, urinary tract infections, and primary bacteremia. Therefore, we investigated whether RDW is an independent predictor of mortality in patients with Gram-negative bacteremia. Clinical characteristics, laboratory parameters, and outcomes of 161 patients with Gram-negative bacteremia from November 2010 to March 2011 diagnosed at Severance Hospital, Yonsei University College of Medicine, Seoul, Korea, were retrospectively analyzed. The main outcome measure was 28-day all-cause mortality. The 28-day mortality rate was significantly higher in the increased RDW group compared with the normal RDW group (P < 0.001). According to multivariate Cox proportional hazard analysis, RDW levels at the onset of bacteremia (per 1% increase, P = 0.036), the Charlson index (per 1-point increase, P < 0.001), and the Sequential Organ Failure Assessment score (per 1-point increase, P = 0.001) were independent risk factors for 28-day mortality. Moreover, the nonsurvivor group had significantly higher RDW levels 72 h after the onset of bacteremia than did the survivor group (P = 0.001). In addition, the area under the curve of RDW at the onset of bacteremia, the 72-h RDW, and the Sequential Organ Failure Assessment score for 28-day mortality were 0.764 (P = 0.001), 0.802 (P < 0.001), and 0.703 (P = 0.008), respectively. Red blood cell distribution width at the onset of bacteremia was an independent predictor of mortality in patients with Gram-negative bacteremia. Also, 72-h RDW could be a predictor for all-cause mortality in patients with Gram-negative bacteremia.
Aygun, Fatih; Cam, Halit
Bacillus cereus can cause serious, life-threatening, systemic infections in immunocompromised patients. The ability of microorganism to form biofilm on biomedical devices can be responsible for catheter-related bloodstream infections. Other manifestations of severe disease are meningitis, endocarditis, osteomyelitis, and surgical and traumatic wound infections. The most common feature in true bacteremia caused by Bacillus is the presence of an intravascular catheter. Herein, we report a case of catheter-related bacteremia caused by B. cereus in a patient with propionic acidemia. PMID:27195164
Aygun, Fatma Deniz; Aygun, Fatih; Cam, Halit
Bacillus cereus can cause serious, life-threatening, systemic infections in immunocompromised patients. The ability of microorganism to form biofilm on biomedical devices can be responsible for catheter-related bloodstream infections. Other manifestations of severe disease are meningitis, endocarditis, osteomyelitis, and surgical and traumatic wound infections. The most common feature in true bacteremia caused by Bacillus is the presence of an intravascular catheter. Herein, we report a case of catheter-related bacteremia caused by B. cereus in a patient with propionic acidemia.
Karunakaran, R; Halim, H A; Ng, K P; Hanifah, Y A; Chin, E; Jaafar, F L; Abubakar, S
Tsukamurella spp. are a rare but important cause of intravascular catheter-related bacteremia in immunocompromised patients. The organism is an aerobic, Gram-positive, weakly acid-fast bacillus that is difficult to differentiate using standard laboratory methods from other aerobic actinomycetales such as Nocardia spp., Rhododoccus spp., Gordonia spp., and the rapid growing Mycobacterium spp. We report a case of Tsukamurella tyrosinosolvens catheter-related bacteremia in a 51-year-old haematology patient who responded to treatment with imipenem and subsequent line removal. 16srRNA sequencing allowed for the prompt identification of this organism.
Smith, Janessa M; Avdic, Edina; Tamma, Pranita D; Zhang, Long; Carroll, Karen C; Cosgrove, Sara E
The objective of this study was to determine risk factors for the development of resistance to β-lactams/β-lactamase inhibitors (βL/βLIs) and ertapenem among Bacteroides species bacteremia. We conducted a retrospective case-control study of 101 adult patients with Bacteroides species bacteremia at a 1,051-bed tertiary care medical center. The duration of exposure to βL/βLIs (odds ratio [OR], 1.25; 95% confidence interval [CI], 1.08 to 2.31) was the only independent risk factor for resistance. Copyright © 2015, American Society for Microbiology. All Rights Reserved.
Kwon, Hee Jin; Yoo, Kwai Han; Kim, In Young; Lee, Seulkee; Jang, Hye Ryoun; Kwon, Ghee Young
Megalocytic interstitial nephritis is a rare form of kidney disease caused by chronic inflammation. We report a case of megalocytic interstitial nephritis occurring in a 45-yrold woman who presented with oliguric acute kidney injury and acute pyelonephritis accompanied by Escherichia coli bacteremia. Her renal function was not recovered despite adequate duration of susceptible antibiotic treatment, accompanied by negative conversion of bacteremia and bacteriuria. Kidney biopsy revealed an infiltration of numerous histiocytes without Michaelis-Gutmann bodies. The patient's renal function was markedly improved after short-term treatment with high-dose steroid.
Pãosinho, Ana; Azevedo, Telma; Alves, João V.; Costa, Isabel A.; Carvalho, Gustavo; Peres, Susana R.; Baptista, Teresa; Borges, Fernando; Mansinho, Kamal
Enterococci are one of the usual residents of the microflora in humans. In the last decade this genus has been reported as the third most common cause of bacteremia. We present the case of a 78-year-old female who was admitted to the emergency room because of nausea, lipothymia, and weakness. She was diagnosed with a pyelonephritis with bacteremia, with the isolation in blood and urine cultures of Escherichia coli and Enterococcus hirae. This last microorganism is a rarely isolated pathogen in humans. Currently it is estimated to represent 1–3% of all enterococcal species isolated in clinical practice. PMID:27127665
Al Soub, Hussam; Al Maslamani, Mona; Al Khuwaiter, Jameela; El Deeb, Yasser; Abu Khattab, Mohammed
A case of pacemaker infection complicated by bacteremia and myocardial abscess caused by Mycobacterium fortuitum is reported and 9 other cases of pacemaker infection associated with rapidly growing mycobacteria are reviewed. Most cases developed within 6 months from implantation suggesting nosocomial acquisition. Wound discharge, fever, and pain at generator site were the most common presenting features. At presentation they had a median duration of symptoms of 34 days. Concomitant bacteremia was present in half of the cases. Antibiotics therapy and removal of the pacemaker system were needed to achieve cure in the majority of cases. Clarithromycin and fluoroquinolones were the most commonly used antibiotics.
Samet, A; Sledzińska, A; Krawczyk, B; Hellmann, A; Nowicki, S; Kur, J; Nowicki, B
In patients with leukemia, the portal(s) and reasons for the persistence of an Escherichia coli recurrent bacteremia remain unclear. Adult Hematology Clinic (AHC) databases at the State Clinical Hospital in Gdańsk were reviewed to evaluate the frequency of E. coli bacteremia between 2002 and 2005. Blood and bowel E. coli strains were obtained and the genetic relatedness of the strains was analyzed. The rate of E. coli bacteremia per 1,000 admissions at the AHC was higher (85.0) than in the other clinics of the hospital (2.9), p < 0.001. A higher mortality was observed in patients with a history of E. coli versus non-E. coli bacteremia [30/95 (31 %) vs. 53/430 (12 %), p < 0.001]; 72.8 % of patients with leukemia had an unknown source of bacteremia. In 2005, 6 out of 25 (24 %) patients with leukemia had ≥2 episodes of E. coli-positive blood cultures. These gastrointestinal E. coli isolates were replaced within 3-8 weeks with a new E. coli H genotype. A recurrent episode of bacteremia was usually caused by an infection with a transient E. coli H genotype identical to that found in the subject's bowel. Consistent with the definition of bowel/blood translocation, the bowel appeared to be a portal for E. coli in these subjects and, hence, a clear source for their recurring bacteremia.
Morozumi, Toshiya; Kubota, Takehiko; Abe, Daisuke; Shimizu, Taro; Komatsu, Yasutaka; Yoshie, Hiromasa
Transient bacteremia frequently occur secondary to several periodontal procedures. The purpose of the present study is to investigate the effects of irrigation with an essential oil-containing antiseptic (EO) and oral administration of azithromycin (AZM) on bacteremia caused by scaling and root planing (SRP). Thirty patients with chronic periodontitis were randomly assigned to three groups (control, EO, and AZM). The EO group received quadrant subgingival irrigation with EO, and mouthrinsing was continued at home for 1 week. Oral administration of AZM was started 3 days before SRP in the AZM group. No adjunctive treatment was performed before SRP in the control group. Peripheral blood and subgingival plaque were collected at baseline and after 1 week. The second blood sample was taken 6 minutes after the initiation of quadrant SRP. The blood samples were cultured and analyzed for bacteremia. Quantitative analysis of periodontopathic bacteria in the sulcus was performed using the polymerase chain reaction Invader method. Bacteremia incidence rates were 90%, 70%, and 20% for the control, EO, and AZM groups, respectively. Significant reduction of the incidence of bacteremia was shown in the AZM group only (P <0.01). Subgingival bacterial counts significantly decreased in both the EO and AZM groups (P <0.01). Quadrant SRP frequently induced bacteremia. Although AZM was effective in reducing bacteremia incidence, EO showed less effectiveness.
Aliyev, D A; Vezirova, Z Sh; Geyusheva, T F
Dynamics of procalcitonin level was studied in 75 pediatric patients, in whom on back- ground of polychemotherapy conduction for oncological disease bacteremia and neutropenia have occurred. Determination of procalcitonin level as a rapidly reacting biomarker of generalized infectious process permits to establish its progression, to con- duct early diagnosis, to perform timely and adequate treatment measures.
Nakamura, Itaru; Ohkusu, Kiyofumi; Nakagami, Yoshihiro; Tachibana, Masaaki; Matsumoto, Tetsuya
A case of bacteremia caused by a rare Helicobacter species, Campylobacter-like organism 3 (CLO-3), in a 75-year-old man with prostate cancer and an indwelling urethral catheter for urinary retention, is reported. Oral levofloxacin (500mg per day) was effective, although the results of antimicrobial susceptibility testing were unknown. Non-film-like, small, clear colonies were isolated on blood agar after 72h of microaerobic incubation at 37°C. Biochemical testing indicated that the isolates were catalase-positive, negative for nitrate reduction and urease activity, and positive for indoxyl acetate hydrolysis. The isolate was identified as CLO-3 by sequence analysis of the 16S rRNA and hsp60 genes. Although CLO-3 is known to cause enterocolitis, bacteremia due to CLO-3 has not been described. There have been an increasing number of reports of bacteremia caused by Helicobacter cinaedi and Helicobacter fennelliae, which were first reported as CLO-1 and CLO-2, and CLO-3 may represent another emerging cause of Helicobacter-induced bacteremia.
Patel, Jean Baldus; Clarridge, Jill; Schuster, Mindy S.; Waddington, Michael; Osborne, Janet; Nachamkin, Irving
We report a case of Leptotrichia species bacteremia in a patient undergoing treatment for acute myelogenous leukemia. Like previously reported Leptotrichia species, this is a gram-variable, pleomorphic rod that is catalase negative and utilizes glucose and sucrose. However, it is more fastidious than previously reported isolates of Leptotrichia and may represent a novel species. PMID:10325382
Chemaly, Roy F; Rathod, Dhanesh B; Sikka, Monica K; Hayden, Mary K; Hutchins, Mark; Horn, Tracy; Tarrand, Jeffery; Adachi, Javier; Nguyen, Kim; Trenholme, Gorden; Raad, Issam
A national outbreak of Serratia marcescens bacteremia because of contaminated prefilled heparin and saline syringes led to their recall. We evaluated the clinical impact of this outbreak in 57 patients at 3 centers. All patients were symptomatic and were treated with intravenous antibiotics with a fatal outcome in 1 patient.
TX and University of Tennessee Graduate School of Medicine, Knoxville, TN (Rasnake). Correspondence address: MAJ Clinton K Murray, Infectious...Providencia stuartii, Yersinia kristensenii, and Salmonella spp. Overall, burn patients with bacteremia had higher TBSA and ISS, and were more likely
Hizawa, Kazuoki; Nagata, Yuko; Taniguchi, Masahiko; Nakamori, Mari; Matsumoto, Takayuki; Iida, Mitsuo
We describe a case of 36-year-old Japanese man with Crohn's disease, complicated by Bacillus cereus bacteremia on maintenance azathioprine therapy. Although anti-microbial agents were ineffective, the patient became well immediately after a partial resection of the ileum with multiple severe stenosis.
Garcia, I; Fainstein, V; McLaughlin, P
After placement of an Ommaya reservoir, meningitis and bacteremia due to Bacillus cereus occurred in a patient with stage IV lymphoblastic lymphoma and meningeal involvement. Bacillus species have been implicated as meningeal pathogens after lumbar punctures. These organisms have become an important cause of severe infection, especially in immunologically compromised patients.
Köten, Bente; Becker, Karsten; Podschun, Rainer; von Eiff, Christof; Meyer-Hoffert, Ulf; Harder, Jürgen; Gläser, Regine
Staphylococcus aureus is a major human pathogen causing cutaneous infections to life-threatening bacteremia. These infections are often caused by strains derived from the own microflora suggesting that a disturbed epidermal barrier may promote invasion of S. aureus. Antimicrobial peptides and proteins (AMP) such as human beta-defensin-3 and RNase 7 contribute to control the colonization of S. aureus on the skin surface. This leads to the hypothesis that strains with a decreased susceptibility toward skin-derived AMP may better overcome the innate cutaneous defence barrier increasing the possibility of invading into the blood stream. To address this hypothesis we determined whether S. aureus strains from bacteremia patients are less susceptible to various skin-derived AMP than strains from healthy carriers. No differences in the AMP-killing activity against bacteremia-derived S. aureus and control strains were detected suggesting that the onset of S. aureus bacteremia is not based on the varying susceptibilities against skin-derived AMP.
Saksena, R; Manchanda, V; Mittal, M
Bordetella trematum spp. nov. has been isolated from wounds, ear infections and diabetic ulcers. We report a case of a 7-month-old infant with fever, vomiting and abnormal body movements with bacteremia caused by this novel species. The infant responded to fluoroquinolone and macrolide combination therapy.
Derber, Catherine; Coudron, Philip; Tarr, Cheryl; Gladney, Lori; Turnsek, Maryann; Shankaran, Shivanjali; Wong, Edward
Vibrio furnissii in the blood is rarely reported, which may explain why clinical features of bloodstream infections with this organism have not been described. We describe a patient who developed skin lesions and V. furnissii bacteremia and was successfully treated with fluoroquinolones. V. furnissii may be a serious pathogen in patients with underlying comorbidities who are exposed to seafood. PMID:21450956
Oliveira, Marisa I; Batalha, Sara; Gouveia, Catarina; Maia, Raquel; Kjöllerstrom, Paula
Pantoea agglomerans has been classically associated with cellulitis or synovitis secondary to penetrating trauma by vegetation. It is an infrequent cause of systemic infections. We describe the case of a 5-year-old girl with sickle cell disease with P. agglomerans bacteremia and review its potential causes.
Basaglia, G.; Carretto, E.; Barbarini, D.; Moras, L.; Scalone, S.; Marone, P.; De Paoli, P.
We report on the first case of a catheter-related recurrent bacteremia caused by Kocuria kristinae, a gram-positive microorganism belonging to the family Micrococcaceae, in a 51-year-old woman with ovarian cancer. This unusual pathogen may cause opportunistic infections in patients with severe underlying diseases. PMID:11773142
Sng, Li-Hwei; Koh, T. H.; Toney, S. R.; Floyd, M.; Butler, W. R.; Tan, B. H.
Gordonia species have been recognized as pathogens in immunocompromised and immunocompetent patients. We report the first case of bacteremia due to Gordonia bronchialis in a diabetic patient with a sequestrated lung. Species identification was confirmed with mycolic acid analysis by high-performance liquid chromatography and sequencing of the 16S rRNA gene. PMID:15184495
O'Neal, Catherine S; O'Neal, Hollis R; Daniels, Titus L; Talbot, Thomas R
Infections with resistant Enterobacter spp. are increasingly described, yet data on outcomes associated with these infections are limited. A retrospective cohort study was conducted to investigate outcomes of hospitalized patients with third-generation cephalosporin-resistant (CR) Enterobacter bacteremia. Cephalosporin resistance was detected using cefotaxime and cefpodoxime. Patients with Enterobacter spp. bacteremia from January 2006 through February 2008 defined the population. We defined cases as those with CR isolates; controls were patients with bacteremia due to non-CR isolates. Treatment failure was defined as persistence of the presenting signs of infection 72 h after initial culture collection. Of the 95 Enterobacter cases identified, 31 (33%) were CR. CR cases were significantly associated with treatment failure (odds ratio (OR) 2.81, 95% confidence interval (CI) 1.14-6.94). This association was not seen after adjustment for age, simplified acute physiology score (SAPS II), and inappropriate empiric antibiotic therapy. Inappropriate empiric therapy (adjusted OR 3.86, 95% CI 1.32-11.31) and SAPS II score (adjusted OR 1.09, 95% CI 1.02-1.16) were significantly associated with treatment failure in the multivariate analysis. Third-generation cephalosporin-resistant Enterobacter bacteremia is associated with treatment failure due to receipt of inappropriate empiric antibiotic therapy and severity of illness.
Oweira, Hani; Lahdou, Imad; Daniel, Volker; Hofer, Stefan; Mieth, Markus; Schmidt, Jan; Schemmer, Peter; Opelz, Gerhard; Mehrabi, Arianeb; Sadeghi, Mahmoud
Bacterial infections are the most common complications, and the major cause of mortality after liver transplantation (Tx). Neopterin, a marker of immune activation, is produced in monocyte/macrophages in response to inflammation. The aim of our study was to investigate whether early post-operation serum levels of neopterin were associated with post-transplant bacteremia and mortality in liver transplant recipients. We studied 162 of 262 liver Tx patients between January 2008 and February 2011 of whom pre- and early post-Tx sera samples were available. Pre- and early post-operative risk factors of infection and mortality were evaluated in 45 bacteremic patients and 117 non-bacteremic patients. During one-year follow-up, 28 of 262 patients died because of graft failure, septicemia and other diseases. Post-Tx serum neopterin on day 10 (p<0.001) were significantly higher in bacteriemic patients than in patients without bacteremia. Logistic regression analyses showed that day 10 post-Tx neopterin serum level ⩾40 nmol/l has a predictive value (OR=6.86: p<0.001) for bacteremia and mortality (OR=3.47: p=0.021). Our results suggest that early post-Tx neopterin serum levels are very sensitive predictive markers of one-year post-Tx bacteremia and mortality in liver Tx recipients. Copyright © 2015 American Society for Histocompatibility and Immunogenetics. Published by Elsevier Inc. All rights reserved.
Lin, Yijun; Foo, Kelly; Koh, Han Fang; Tow, Charlene; Zhang, Yiwen; Ang, Li Wei; Cui, Lin; Badaruddin, Hishamuddin; Ooi, Peng Lim; Lin, Raymond Tzer Pin; Cutter, Jeffery
We conducted a retrospective study of 40 case-patients and 58 controls as part of a nationwide investigation of a group B Streptococcus outbreak in Singapore in 2015. Eating a Chinese-style raw fish dish (yusheng) was a major risk factor for bacteremia, particularly caused by serotype III sequence type 283. PMID:27767904
Conway, Laurie J; Carter, Eileen J; Larson, Elaine L
A systematic appraisal of evidence suggests that male patients in hospital may be at higher risk for bacteremia following urinary catheter-associated bacteriuria than females. Other risk factors include immunosuppressant medication, red blood cell transfusion, neutropenia, malignancy, and liver disease.
Buss, Sarah N.; Starlin, Richard
Microbacterium species are non-spore-forming, Gram-positive rods rarely associated with human disease. In this report, we describe the first case of bacteremia caused by Microbacterium binotii in a patient with sickle cell anemia. The utility of using 16S rRNA gene sequence analysis along with phenotypic methods for identification is shown. PMID:24197889
Kichloo, Asim Ahmed; Hallac, Alexander; Mousavi, Ben; Hirekhan, Omkar
Erysipelothrix rhusiopathiae, a pleomorphic gram-positive bacillus, is found widely in nature or as a commensal pathogen. It infects domestic animals such as swine, which may be the major reservoir of the organism. E. rhusiopathiae is primarily an occupational illness; 89% of the cases are linked to high-risk epidemiological situations. Humans that are infected by this bacillus typically present with one or a combination of the following symptoms: localized skin lesion (erysipeloid), diffuse cutaneous eruptions with systemic symptoms, or bacteremia, which is often followed by endocarditis. We report a case of E. rhusiopathiae bacteremia that was present without severe clinical illness such as endocarditis, arthritis, or skin lesions. The patient was a 64-year-old male with a complicated past medical history including subclinical alcoholic liver disease. Penicillin-G therapy completely resolved the patients bacteremia. The case presented has exceptional clinical merit due to 2 key factors: the patient does not fit the occupational demographic typically affected by this bacterium, and the patient presented with subclinical septicemia, which has a high correlation with fatal endocarditis. This case brings a new prospective to E. rhusiopathiae bacteremia.
Li, Guohua; Zeng, Sheng; Chen, Youxiang; Zhou, Xiaojiang; Lv, Nonghua
Background. The bacteremia is reported as being infrequent and transient in gastric EMR and ESD for treating gastric mucosa lesions or superficial gastric neoplastic lesion. There was no report of it being investigated in ESD for treating gastric muscular layer tumors (endoscopic submucosal excavation, ESE). This study aimed to determine the frequency of bacteremia in gastric ESE. Patients and Methods. A prospective study, in 122 consecutive patients who underwent gastric ESE for treating gastric muscular layer tumors, investigated the frequency of bacteremia before and 15 minutes after the procedure. Results. The median time for the total ESE procedure was 29 min (range from 8 to 62 min). The mean size of the biggest diameter of each resected specimen was 10 ± 2.7 mm (range from 5 mm to 30 mm). Blood cultures obtained before ESE were positive in 0% (0/122) of cases. Blood cultures obtained 15 min after ESE were positive in 2.5% (3/122) of cases. Six blood samples contained Staphylococcus with coagulase negative, which was considered contaminant. No signs of sepsis were seen in all patients. Conclusions. The frequency of bacteremia after gastric ESE was low. ESE for treating gastric lesions is thought to have a low risk of infectious complications; therefore, prophylactic administration of antibiotics may not be warranted. PMID:26060492
Arpi, Magnus; Klein, Kasper; Justesen, Ulrik S.
The genus Oscillibacter has been known since 2007, but no association to human infection has been reported. Here, we present four cases of Oscillibacter ruminantium bacteremia from hospitals across Denmark from 2001 to 2010. Correct identification is now possible, as the 16S rRNA gene sequence was recently made publicly available. PMID:24501034
do Nascimento, Marcelo Mazza; Chula, Domingos Candiota; Riella, Miguel Carlos
There is growing concern about the development of antibacterial resistance with the use of antibiotics in catheter lock solutions. The use of an antibiotic that is not usually used to treat other serious infections may be an alternative that may reduce the clinical impact should resistance develop. We conducted a randomized controlled trial to compare a solution of minocycline and EDTA with the conventional unfractionated heparin for the prevention of catheter-related bacteremia in hemodialysis patients during a period of 90 d. The study included 204 incident catheters (27.8% tunneled); 14 catheters were excluded because of early dysfunction and 3 because of protocol violations. We observed catheter-related bacteremia in 19 patients in the heparin group (4.3 per 1000 catheter-days) and in 5 patients in the minocycline-EDTA group (1.1 per 1000 catheter-days; P = 0.005). We did not detect a significant difference in the rate of catheter removal for dysfunction. Catheter-related bacteremia-free survival was significantly higher in the minocycline-EDTA group than in the heparin group (P = 0.005). In conclusion, a minocycline-EDTA catheter lock solution is effective in the prevention of catheter-related bacteremia in hemodialysis patients. PMID:21852579
Chan, Kevin E; Warren, H Shaw; Thadhani, Ravi I; Steele, David J R; Hymes, Jeffrey L; Maddux, Franklin W; Hakim, Raymond M
Staphylococcus bacteremia is a common and life-threatening medical emergency, but it is treatable with appropriate antibiotic therapy. To identify opportunities that may reduce morbidity and mortality associated with S. aureus, we analyzed data from 293,094 chronic hemodialysis outpatients to characterize practices of antibiotic selection. In the study population, the overall rate of bacteremia was 15.4 per 100 outpatient-years; the incidence rate for methicillin-sensitive (MSSA) was 2.1 per 100 outpatient-years, and the incidence rate for methicillin-resistant (MRSA) S. aureus was 1.9 per 100 outpatient-years. One week after the collection of the index blood culture, 56.1% of outpatients with MSSA bacteremia were receiving vancomycin, and 16.7% of outpatients with MSSA were receiving cefazolin. Among MSSA-bacteremic patients who did not die or get hospitalized 1 week after blood culture collection, use of cefazolin was associated with a 38% lower risk for hospitalization or death compared with vancomycin (adjusted HR=0.62, 95% CI=0.46-0.84). In conclusion, vancomycin is commonly used to treat MSSA bacteremia in outpatients receiving chronic dialysis, but there may be more risk of treatment failure than observed among those individuals who receive a β-lactam antibiotic such as cefazolin.
Warren, H. Shaw; Thadhani, Ravi I.; Steele, David J.R.; Hymes, Jeffrey L.; Maddux, Franklin W.; Hakim, Raymond M.
Staphylococcus bacteremia is a common and life-threatening medical emergency, but it is treatable with appropriate antibiotic therapy. To identify opportunities that may reduce morbidity and mortality associated with S. aureus, we analyzed data from 293,094 chronic hemodialysis outpatients to characterize practices of antibiotic selection. In the study population, the overall rate of bacteremia was 15.4 per 100 outpatient-years; the incidence rate for methicillin-sensitive (MSSA) was 2.1 per 100 outpatient-years, and the incidence rate for methicillin-resistant (MRSA) S. aureus was 1.9 per 100 outpatient-years. One week after the collection of the index blood culture, 56.1% of outpatients with MSSA bacteremia were receiving vancomycin, and 16.7% of outpatients with MSSA were receiving cefazolin. Among MSSA-bacteremic patients who did not die or get hospitalized 1 week after blood culture collection, use of cefazolin was associated with a 38% lower risk for hospitalization or death compared with vancomycin (adjusted HR=0.62, 95% CI=0.46–0.84). In conclusion, vancomycin is commonly used to treat MSSA bacteremia in outpatients receiving chronic dialysis, but there may be more risk of treatment failure than observed among those individuals who receive a β-lactam antibiotic such as cefazolin. PMID:22904350
Lee, Chung-Hsun; Lee, Ching-Chi; Hsieh, Chih-Chia; Hong, Ming-Yuan; Chi, Chih-Hsien
Enterobacteriaceae is a leading pathogen of community-onset bacteremia. This study aims to establish a predictive scoring algorithm to identify adults with community-onset Enterobacteriaceae bacteremia who are at risk for abscesses. Of the total 1262 adults, 152 (12.0%) with abscess occurrence were noted. The 6 risk factors significantly associated with abscess occurrence-liver cirrhosis, diabetes mellitus, thrombocytopenia and high C-reactive protein (>100 mg/L) at bacteremic onset, delayed defervescence, and bacteremia-causing Klebsiella pneumoniae-were each assigned +1 point to form the scoring algorithm. In contrast, the elderly, fatal comorbidity (McCabe classification), and bacteremia-causing Escherichia coli were each assigned -1 point, owing to their negative associations with abscess occurrence. Using the proposed scoring algorithm, a cut-off value of +1 yielded a high sensitivity (85.5%) and an acceptable specificity (60.4%). Although the proposed predictive model needs further validation, this simple scoring algorithm may be useful for the early identification of abscesses by clinicians.
Campbell, Judith R; Hulten, Kristina; Baker, Carol J
We report an outbreak of Bacillus bacteremia among premature infants during a construction project. Our investigation revealed potential environmental sources. After replacement of air filters, cleaning of the unit, emphasis on hand hygiene, and relocation of the loading dock for linen and supply delivery, no further cases were detected.
Kichloo, Asim Ahmed; Mousavi, Ben; Hirekhan, Omkar
Erysipelothrix rhusiopathiae, a pleomorphic gram-positive bacillus, is found widely in nature or as a commensal pathogen. It infects domestic animals such as swine, which may be the major reservoir of the organism. E. rhusiopathiae is primarily an occupational illness; 89% of the cases are linked to high-risk epidemiological situations. Humans that are infected by this bacillus typically present with one or a combination of the following symptoms: localized skin lesion (erysipeloid), diffuse cutaneous eruptions with systemic symptoms, or bacteremia, which is often followed by endocarditis. We report a case of E. rhusiopathiae bacteremia that was present without severe clinical illness such as endocarditis, arthritis, or skin lesions. The patient was a 64-year-old male with a complicated past medical history including subclinical alcoholic liver disease. Penicillin-G therapy completely resolved the patients bacteremia. The case presented has exceptional clinical merit due to 2 key factors: the patient does not fit the occupational demographic typically affected by this bacterium, and the patient presented with subclinical septicemia, which has a high correlation with fatal endocarditis. This case brings a new prospective to E. rhusiopathiae bacteremia. PMID:23819078
Conway, Laurie J.; Carter, Eileen J.; Larson, Elaine L.
A systematic appraisal of evidence suggests that male patients in hospital may be at higher risk for bacteremia following urinary catheter-associated bacteriuria than females. Other risk factors include immunosuppressant medication, red blood cell transfusion, neutropenia, malignancy, and liver disease. PMID:26402994
von Kietzell, M; Richter, H; Bruderer, T; Goldenberger, D; Emonet, S; Strahm, C
Neisseria cinerea is a human commensal. The first known case of meningitis and bacteremia due to Neisseria cinerea following percutaneous glycerol instillation of the trigeminal ganglion is reported. Conventional phenotypic methods and complete 16S RNA gene sequencing accurately identified the pathogen. Difficulties in differentiation from pathogenic neisseriae are discussed.
Richter, H.; Bruderer, T.; Goldenberger, D.; Emonet, S.; Strahm, C.
Neisseria cinerea is a human commensal. The first known case of meningitis and bacteremia due to Neisseria cinerea following percutaneous glycerol instillation of the trigeminal ganglion is reported. Conventional phenotypic methods and complete 16S RNA gene sequencing accurately identified the pathogen. Difficulties in differentiation from pathogenic neisseriae are discussed. PMID:26511743
Hung, Yuan-Pin; Lin, Hsiao-Ju; Wu, Chi-Jung; Chen, Po-Lin; Lee, Jen-Chieh; Liu, Hsiao-Chieh; Wu, Yi-Hui; Yeh, Fang Hao; Tsai, Pei-Jane; Ko, Wen-Chien
An 85 year-old male initially admitted for septic shock due to urinary tract infection experienced Clostridium difficile-associated diarrhea during hospitalization and was treated by oral vancomycin. His clinical course was complicated by cytomegalovirus colitis and then vancomycin-resistant Clostridium innocuum bacteremia, which was cured by uneventfully parenteral piperacillin-tazobactam therapy. Copyright © 2014 Elsevier Ltd. All rights reserved.
Tande, Aaron J; Palraj, Bharath Raj; Osmon, Douglas R; Berbari, Elie F; Baddour, Larry M; Lohse, Christine M; Steckelberg, James M; Wilson, Walter R; Sohail, M Rizwan
Staphylococcus aureus bacteremia is a life-threatening condition that may lead to metastatic infection, including prosthetic joint infection. To assess clinical factors associated with hematogenous prosthetic joint infection, we retrospectively reviewed all patients with a joint arthroplasty in place at the time of a first episode of S. aureus bacteremia over a 5-year period at our institution. Patients with postsurgical prosthetic joint infection without hematogenous prosthetic joint infection were excluded. There were 85 patients (143 arthroplasties) with either no prosthetic joint infection (n = 50; 58.8%) or hematogenous prosthetic joint infection in at least one arthroplasty (n = 35; 41.2%). The odds of hematogenous prosthetic joint infection was significantly increased among patients with community-acquired S. aureus bacteremia (odds ratio [OR] 18.07; 95% confidence interval [CI] 2.64-infinity; P = .001), as compared with nosocomial S. aureus bacteremia, in which there were no patients with hematogenous prosthetic joint infection. After adjusting for S. aureus bacteremia classification, the presence of ≥3 joint arthroplasties in place was associated with a nearly ninefold increased odds of hematogenous prosthetic joint infection as compared with those with 1-2 joint arthroplasties in place (OR 8.55; 95% CI 1.44-95.71; P = .012). All but one joint with prosthetic joint infection demonstrated at least one clinical feature suggestive of infection. There were 4 additional S. aureus prosthetic joint infections diagnosed during a median of 3.4 years of follow-up post hospitalization for S. aureus bacteremia. Prosthetic joint infection is frequent in patients with existing arthroplasties and concomitant S. aureus bacteremia, particularly with community-acquired S. aureus bacteremia and multiple prostheses. In contrast, occult S. aureus prosthetic joint infection without clinical features suggestive of prosthetic joint infection at the time of S. aureus bacteremia
Bodro, Marta; Gudiol, Carlota; Garcia-Vidal, Carolina; Tubau, Fe; Contra, Anna; Boix, Lucía; Domingo-Domenech, Eva; Calvo, Mariona; Carratalà, Jordi
Infection due to the six ESKAPE pathogens has recently been identified as a serious emerging problem. However, there is still a lack of information on bacteremia caused by these organisms in cancer patients. We aimed to assess the epidemiology, antibiotic therapy and outcomes of bacteremia due to drug-resistant ESKAPE pathogens (rESKAPE) in patients with cancer. All episodes of bacteremia prospectively documented in hospitalized adults with cancer from 2006 to 2011 were analyzed. Of 1,148 episodes of bacteremia, 392 (34 %) were caused by ESKAPE pathogens. Fifty-four episodes (4.7 %) were due to rESKAPE strains (vancomycin-resistant Enterococcus faecium 0, methicillin-resistant Staphylococcus aureus (MRSA) 13, extended-spectrum beta-lactamase (ESLB)-producing Klebsiella pneumoniae 7, carbapenem-resistant Acinetobacter baumannii 4, carbapenem- and quinolone-resistant Pseudomonas aeruginosa 18 and derepression chromosomic ß-lactam and ESBL-producing Enterobacter species 12. Risk factors independently associated with rESKAPE bacteremia were comorbidities, prior antibiotic therapy, urinary catheter and urinary tract source. Inappropriate empirical antibiotic therapy was more frequent in patients with rESKAPE bacteremia than in the other cases (55.6 % vs. 21.5 %, p < 0.001). Persistence of bacteremia (25 % vs. 9.7 %), septic metastasis (8 % vs. 4 %) and early case-fatality rate (23 % vs. 11 %) were more frequent in patients with rESKAPE bacteremia than in patients with other etiologies (p < 0.05). Bacteremia due to rESKAPE pathogens in cancer patients occurs mainly among those with comorbidities who have received prior antibiotic therapy and have a urinary tract source. These patients often receive inappropriate empirical antibiotic therapy and have a poor outcome.
Maggi, Ricardo G; Ericson, Marna; Mascarelli, Patricia E; Bradley, Julie M; Breitschwerdt, Edward B
Bartonella henselae is a zoonotic, alpha Proteobacterium, historically associated with cat scratch disease (CSD), but more recently associated with persistent bacteremia, fever of unknown origin, arthritic and neurological disorders, and bacillary angiomatosis, and peliosis hepatis in immunocompromised patients. A family from the Netherlands contacted our laboratory requesting to be included in a research study (NCSU-IRB#1960), designed to characterize Bartonella spp. bacteremia in people with extensive arthropod or animal exposure. All four family members had been exposed to tick bites in Zeeland, southwestern Netherlands. The mother and son were exhibiting symptoms including fatigue, headaches, memory loss, disorientation, peripheral neuropathic pain, striae (son only), and loss of coordination, whereas the father and daughter were healthy. Each family member was tested for serological evidence of Bartonella exposure using B. vinsonii subsp. berkhoffii genotypes I-III, B. henselae and B. koehlerae indirect fluorescent antibody assays and for bacteremia using the BAPGM enrichment blood culture platform. The mother was seroreactive to multiple Bartonella spp. antigens and bacteremia was confirmed by PCR amplification of B. henselae DNA from blood, and from a BAPGM blood agar plate subculture isolate. The son was not seroreactive to any Bartonella sp. antigen, but B. henselae DNA was amplified from several blood and serum samples, from BAPGM enrichment blood culture, and from a cutaneous striae biopsy. The father and daughter were seronegative to all Bartonella spp. antigens, and negative for Bartonella DNA amplification. Historically, persistent B. henselae bacteremia was not thought to occur in immunocompetent humans. To our knowledge, this study provides preliminary evidence supporting the possibility of persistent B. henselae bacteremia in immunocompetent persons from Europe. Cat or flea contact was considered an unlikely source of transmission and the mother, a
Background Bartonella henselae is a zoonotic, alpha Proteobacterium, historically associated with cat scratch disease (CSD), but more recently associated with persistent bacteremia, fever of unknown origin, arthritic and neurological disorders, and bacillary angiomatosis, and peliosis hepatis in immunocompromised patients. A family from the Netherlands contacted our laboratory requesting to be included in a research study (NCSU-IRB#1960), designed to characterize Bartonella spp. bacteremia in people with extensive arthropod or animal exposure. All four family members had been exposed to tick bites in Zeeland, southwestern Netherlands. The mother and son were exhibiting symptoms including fatigue, headaches, memory loss, disorientation, peripheral neuropathic pain, striae (son only), and loss of coordination, whereas the father and daughter were healthy. Methods Each family member was tested for serological evidence of Bartonella exposure using B. vinsonii subsp. berkhoffii genotypes I-III, B. henselae and B. koehlerae indirect fluorescent antibody assays and for bacteremia using the BAPGM enrichment blood culture platform. Results The mother was seroreactive to multiple Bartonella spp. antigens and bacteremia was confirmed by PCR amplification of B. henselae DNA from blood, and from a BAPGM blood agar plate subculture isolate. The son was not seroreactive to any Bartonella sp. antigen, but B. henselae DNA was amplified from several blood and serum samples, from BAPGM enrichment blood culture, and from a cutaneous striae biopsy. The father and daughter were seronegative to all Bartonella spp. antigens, and negative for Bartonella DNA amplification. Conclusions Historically, persistent B. henselae bacteremia was not thought to occur in immunocompetent humans. To our knowledge, this study provides preliminary evidence supporting the possibility of persistent B. henselae bacteremia in immunocompetent persons from Europe. Cat or flea contact was considered an unlikely
Lee, Ching-Chi; Lee, Nan-Yao; Yan, Jing-Jou; Lee, Hsin-Chun; Chen, Po-Lin; Chang, Chia-Ming; Wu, Chi-Jung; Ko, Nai-Ying; Wang, Li-Rong; Chi, Chih-Hsien; Ko, Wen-Chien
Enterobacter cloacae is an important nosocomial pathogen. However, few studies specifically dealing with the clinical characteristics and outcome of extended-spectrum beta-lactamase (ESBL)-producing E. cloacae infections have been published. During an 8-year period in a medical center, of 610 E. cloacae bacteremic isolates, 138 (22.6%) with ESBL genes were designated the ESBL group, and 120 (19.6%) cefotaxime-nonsusceptible isolates without the ESBL phenotype and genes were designated the control group. Of the former group of isolates, 133 (96.3%) carried the bla(SHV-12) gene, 3 (2.1%) had bla(CTX-M3), and 2 (1.4%) had both the bla(SHV-12) and bla(CTX-M3) genes. After patients under the age of 18 years were excluded, there were 206 adults with E. cloacae bacteremia, and these consisted of 121 patients in the ESBL group and 85 in the control group. More episodes of hospital-onset and polymicrobial bacteremia, increased severity of illness, more cases of bacteremia onset in intensive care units (ICUs), and longer stays in the hospital and ICU after bacteremia onset were noted in the ESBL group. However, the crude and sepsis-related mortality rates in two groups were similar. Of the ESBL group, the in-hospital sepsis-related mortality rate of patients definitively treated by a carbapenem was lower than that of those treated by noncarbapenem beta-lactams (5/53, or 9.4%, versus 13/44, or 29.5%; P = 0.01) though the difference was not significant in the hierarchical multivariate analysis (P = 0.46). Among 62 patients with follow-up blood cultures within 14 days of bacteremia onset, breakthrough bacteremia was more common in those treated by a noncarbapenem beta-lactam agent than in those treated by a carbapenem (18/31, or 58.0%, versus 3/31, or 9.6%; P < 0.001). Thus, carbapenem therapy for ESBL-producing E. cloacae that cause bacteremia may provide therapeutic benefits.
Riu, Marta; Chiarello, Pietro; Terradas, Roser; Sala, Maria; Garcia-Alzorriz, Enric; Castells, Xavier; Grau, Santiago; Cots, Francesc
Aim To calculate the incremental cost of nosocomial bacteremia caused by the most common organisms, classified by their antimicrobial susceptibility. Methods We selected patients who developed nosocomial bacteremia caused by Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, or Pseudomonas aeruginosa. These microorganisms were analyzed because of their high prevalence and they frequently present multidrug resistance. A control group consisted of patients classified within the same all-patient refined-diagnosis related group without bacteremia. Our hospital has an established cost accounting system (full-costing) that uses activity-based criteria to analyze cost distribution. A logistic regression model was fitted to estimate the probability of developing bacteremia for each admission (propensity score) and was used for propensity score matching adjustment. Subsequently, the propensity score was included in an econometric model to adjust the incremental cost of patients who developed bacteremia, as well as differences in this cost, depending on whether the microorganism was multidrug-resistant or multidrug-sensitive. Results A total of 571 admissions with bacteremia matched the inclusion criteria and 82,022 were included in the control group. The mean cost was € 25,891 for admissions with bacteremia and € 6,750 for those without bacteremia. The mean incremental cost was estimated at € 15,151 (CI, € 11,570 to € 18,733). Multidrug-resistant P. aeruginosa bacteremia had the highest mean incremental cost, € 44,709 (CI, € 34,559 to € 54,859). Antimicrobial-susceptible E. coli nosocomial bacteremia had the lowest mean incremental cost, € 10,481 (CI, € 8,752 to € 12,210). Despite their lower cost, episodes of antimicrobial-susceptible E. coli nosocomial bacteremia had a major impact due to their high frequency. Conclusions Adjustment of hospital cost according to the organism causing bacteremia and antibiotic sensitivity could improve
Samanta, Dhritiman; Batte, Justin L; Brown, Stephanie N; Crosby, Angela G; Marcos, Luis A; Elasri, Mohamed O
Staphylococcus aureus is the predominant cause of bacteremia worldwide. We assessed the molecular epidemiology and antibiotic resistance of methicillin-resistant S aureus isolates causing bacteremia in southern Mississippi. Diverse genetic backgrounds in terms of staphylococcal cassette chromosome mec, pulsed-field gel electrophoresis, and multilocus sequence typing types of methicillin-resistant S aureus were identified as causing bacteremia in Mississippi. A strong association of Panton-Valentine leukocidin genes with elevated vancomycin minimum inhibitory concentration is one of the important findings of our study.
Linder, Nehama; Hernandez, Adriana; Amit, Limor; Klinger, Gil; Ashkenazi, Shai; Levy, Itzhak
This study sought to expand current knowledge on the clinical and epidemiological characteristics of persistent coagulase-negative Staphylococcus (CoNS) bacteremia in very-low-birth-weight (VLBW) infants. Background and disease-related data were collected prospectively on 143 VLBW infants diagnosed with CoNS bacteremia at a pediatric tertiary medical center in 1995-2003. Findings were compared between those with persistent (positive blood cultures for >72 h under appropriate treatment ) and nonpersistent disease. Fifty-eight infants (40.6%) were found to have persistent bacteremia. There were no between-group differences in maternal characteristics, mode of delivery, newborn characteristics, dwell time of central venous and umbilical catheters, complications of prematurity, or mean hospital stay. The persistent bacteremia group had significantly higher rates of hypothermia at presentation (37.9% vs. 17.6%, p < 0.04), creatinine >1.2 mg% on treatment day 7 (13.7% vs. 2.4%, p < 0.02; transient phenomenon), and endocarditis (p < 0.03); one infant had an aortic thrombus. Predominantly breast-fed infants had a higher rate of negative cultures within 72 h of appropriate treatment than predominantly formula-fed infants (60% vs. 19%, p < 0.02). In conclusion, persistence of CoNS bacteremia is common in VLBW infants. Endocarditis should be excluded in all infants with persistent disease. Breast-feeding is associated with a shorter disease duration.
Yu, T Y; Kim, H R; Hwang, K E; Lee, J-M; Cho, J H; Lee, J H
The use of computed tomography (CT) in the diagnosis of urinary tract infection (UTI) has rapidly increased recently at acute stage, but the CT findings associated with bacteremia in UTI patients are unknown. 189 UTI patients were enrolled who underwent a CT scan within 24 h after hospital admission. We classified CT findings into eight types: a focal or multifocal wedge-shaped area of hypoperfusion, enlarged kidneys, perinephric fat stranding, ureteritis or pyelitis, complicated renal cyst, renal papillary necrosis, hydronephrosis, and renal and perirenal abscess. A retrospective analysis was conducted to evaluate the CT findings associated with bacteremia. The mean age of these patients was 60 ± 17.2 years, and 93.1 % were women. Concurrent bacteremia was noted in 40.2 % of the patients. Abnormal CT findings were noted in 96.3 % of the patients and 62.4 % had two or more abnormal findings. The most frequent abnormal CT finding was a focal or multifocal wedge-shaped area of hypoperfusion (77.2 %), followed by perinephric fat stranding (29.1 %). Perinephric fat stranding, hydronephrosis, and the presence of two or more abnormal CT findings were significantly associated with bacteremia in patients with community-acquired UTI. In the multivariate logistic regression analysis, age [odds ratio (OR) 1.03; 95 % confidence interval (CI) 1.009-1.062], two or more abnormal CT findings (OR 3.163; 95 % CI 1.334-7.498), and hydronephrosis (OR 13.160; 95 % CI 1.048-165.282) were significantly associated with bacteremia. Physicians should be aware that appropriate early management is necessary to prevent fatality in patients with these CT findings.
Gubbels, Sophie; Nielsen, Jens; Voldstedlund, Marianne; Kristensen, Brian; Schønheyder, Henrik C; Ellermann-Eriksen, Svend; Engberg, Jørgen H; Møller, Jens K; Østergaard, Christian; Mølbak, Kåre
BACKGROUND In 2015, Denmark launched an automated surveillance system for hospital-acquired infections, the Hospital-Acquired Infections Database (HAIBA). OBJECTIVE To describe the algorithm used in HAIBA, to determine its concordance with point prevalence surveys (PPSs), and to present trends for hospital-acquired bacteremia SETTING Private and public hospitals in Denmark METHODS A hospital-acquired bacteremia case was defined as at least 1 positive blood culture with at least 1 pathogen (bacterium or fungus) taken between 48 hours after admission and 48 hours after discharge, using the Danish Microbiology Database and the Danish National Patient Registry. PPSs performed in 2012 and 2013 were used for comparison. RESULTS National trends showed an increase in HA bacteremia cases between 2010 and 2014. Incidence was higher for men than women (9.6 vs 5.4 per 10,000 risk days) and was highest for those aged 61-80 years (9.5 per 10,000 risk days). The median daily prevalence was 3.1% (range, 2.1%-4.7%). Regional incidence varied from 6.1 to 8.1 per 10,000 risk days. The microorganisms identified were typical for HA bacteremia. Comparison of HAIBA with PPS showed a sensitivity of 36% and a specificity of 99%. HAIBA was less sensitive for patients in hematology departments and intensive care units. Excluding these departments improved the sensitivity of HAIBA to 44%. CONCLUSIONS Although the estimated sensitivity of HAIBA compared with PPS is low, a PPS is not a gold standard. Given the many advantages of automated surveillance, HAIBA allows monitoring of HA bacteremia across the healthcare system, supports prioritizing preventive measures, and holds promise for evaluating interventions. Infect Control Hosp Epidemiol 2017;1-8.
Hirai, Jun; Sakanashi, Daisuke; Hagihara, Mao; Haranaga, Shusaku; Uechi, Kohei; Kato, Hideo; Hamada, Hiroyuki; Nishiyama, Naoya; Koizumi, Yusuke; Suematsu, Hiroyuki; Yamagishi, Yuka; Fujita, Jiro; Mikamo, Hiroshige
Gene sequence analysis methods, including 16S rRNA identification, allows accurate identification of Streptococcus species, which include phenotypically closely related species that are difficult to differentiate using conventional chemical methods. We report a case of bacteremia due to Streptococcus tigurinus, identified by 16S rRNA, in a 72-year-old woman with gastrointestinal cancer and ascites. She was hospitalized to undergo elective tumor-related surgery. Five days prior to undergoing surgery, she developed a fever with no obvious source of infection. Blood cultures identified gram-positive cocci. The patient's bacteremia was initially thought to be caused by an Enterococcus species, given her underlying gastrointestinal disease. However, alpha-hemolytic, mucoid, circular colonies were observed on sheep blood agar the following day. Although matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and biochemical testing suggested Streptococcus pneumoniae, we conducted further investigation to identify the bacterium, as the patient had no symptoms of infections usually related with S. pneumoniae such as pneumonia, meningitis, or sinusitis, and the bacteremia occurred 30 days after hospitalization. Finally, the gram-positive cocci were identified as S. tigurinus, assigned to the Streptococcus mitis group in 2012. Although the origin of infection was unclear, it was suspected that peritonitis or bacterial translocation from the gastrointestinal tract caused the bacteremia. This novel species was recently reported as being extremely pathogenic and different from other Streptococcus species. It has been reported to occur in cases of infectious endocarditis and bacteremia. In this article, we reviewed previous reports of S. tigurinus infection and summarized the clinical and pathogenetic features. Copyright © 2016 Japanese Society of Chemotherapy and The Japanese Association for Infectious Diseases. Published by Elsevier Ltd. All rights
Arias-Ortiz, Paola Mariana; Calderón, Libia Del Pilar; Castillo, Juan Sebastián; Moreno, José; Leal, Aura Lucía; Cortés, Jorge Alberto; Álvarez, Carlos Arturo; Grebo, Grupo
Methicillin-resistant Staphylococcus aureus is a frequent pathogen at critical care services. Its presence leads to increased hospital stays and mortality risk in patients with bacteremia. However, the etiology of this resistance marker has not been fully studied. To identify risk factors associated with the emergence of methicillin-resistant S. aureus bacteremia in critically ill patients treated at intensive care units in Bogotá, Colombia. We conducted a retrospective paired case-control study, nested in a cohort of patients diagnosed with S. aureus bacteremia and treated at intensive care units between 2006 and 2008 in Bogotá. Cases were patients with positive blood culture to methicillin resistance, matched in a 1:1 ratio with methicillin-sensitive controls isolated from the same institution and hospitalization year. We used conditional logistic regression to analyze the risk factors associated with the presence of resistance, with emphasis on prior antibiotic therapy. We included 372 patients with S. aureus bacteremia. Factors such as the use of pre-hospital devices: vascular (OR=1.986, 95% CI 1.038 to 3.801) and urinary (OR=2.559, 95% CI: 1.170 to 5.596), along with the number of previously used antibiotics, were associated with the emergence of resistance. The number of antibiotics used previously was determined to have a gradient effect, particularly carbapenems. The rational use of antibiotics and surveillance of exposure to surgical procedures or use of invasive devices are interventions that could diminish the emergence of methicillin-resistant S. aureus bacteremia causes.
González, Andrés Leonardo; Leal, Aura Lucía; Cortés, Jorge Alberto; Sánchez, Ricardo; Barrero, Liliana Isabel; Castillo, Juan Sebastián; Álvarez, Carlos Arturo
Among hospital-acquired infections, bacteremia is one of the leading causes of mortality worldwide, especially among intensive care unit patients, where it is more frequent. Pseudomonas aeruginosa is one of the most aggressive agents causing bacteremia. To evaluate the association between initial antimicrobial therapy and hospital mortality in these patients. A multicenter and retrospective cohort study was conducted between 2005 and 2008. Antimicrobial therapy was considered adequate if it included at least one intravenous antibiotic to which the P. aeruginosa isolate was susceptible in vitro, was administered at the recommended dose and frequency for bacteremia, and initiated within the first 48 hours from diagnosis. The main outcome was 30-day hospital mortality. Patients were paired according to exposure level using propensity score matching, and then a parametric survival model was fitted. One hundred and sixty four patients were included. Median age and the APACHE II score were 56 and 13, respectively. The source of bacteremia was identified in 68.3 % of cases, the respiratory tract being the most frequent. Forty-four percent of patients received inadequate therapy, with bacterial resistance as the main associated variable. The incidence of severe sepsis, septic shock, multiple organ failure and death within the first 30 days was 67.7, 50, 41.5 and 43.9%, respectively. Adequate therapy was associated with a longer time to the event (adjusted time ratio, 2.95, 95% CI, 1.63 to 5.33). Adequate initial antimicrobial therapy is a protective factor against hospital mortality in patients with P. aeruginosa bacteremia.
Schwartz, Ilan Steven; Keynan, Yoav; Gilmour, Matthew W; Dufault, Brenden; Lagacé-Wiens, Philippe
European surveillance studies have reported an increasing incidence of β-hemolytic group G streptococcal bacteremia, but no studies have evaluated trends in β-hemolytic streptococcal bacteremia in North America. We reviewed bacteremic episodes and positive throat swab cultures from two tertiary care centers in Manitoba, Canada, from January 2007 to December 2012. During the study period, 19 864 bacteremic episodes, and 9948 positive throat swabs were identified. There were 1025 (5.16%) bacteremic episodes attributable to β-hemolytic streptococci: 425 (2.03%), 339 (1.71%), 62 (0.31%), and 199 (0.95%) to β-hemolytic groups A, B, C, and G streptococci, respectively. From 2007 to 2012, there were significant increases in the proportion of bacteremia attributable to β-hemolytic streptococci in general (6.32% vs. 4.02%; p<0.0001; linear trend test, p<0.0001), and to groups G (1.49% vs. 0.43%; p<0.0001; linear trend test, p<0.0001) and C (0.58% vs. 0.13%; p=0.0068; linear trend test, p=0.0105) β-hemolytic streptococci in particular. Bacteremia attributable to groups A and B β-hemolytic streptococci and Streptococcus pneumoniae were unchanged. There were no changes in the distribution of β-hemolytic streptococcal groups among throat swabs. Bacteremia attributable to β-hemolytic groups G and C streptococci increased in Manitoba, Canada. Further study of the factors underlying these changes is required.
Park, So-Youn; Oh, In-Hwan; Lee, Hee-Joo; Ihm, Chun-Gyoo; Son, Jun Seong
Vancomycin has been a key antibiotic agent for the treatment of methicillin-resistant Staphylococcus aureus (MRSA) infections. However, little is known about the relationship between vancomycin MIC values at the higher end of the susceptibility range and clinical outcomes. The aim of this study was to determine the impact of MRSA bacteremia on clinical outcomes in patients with a vancomycin MIC near the upper limit of the susceptible range. Patients with MRSA bacteremia were divided into a high-vancomycin-MIC group (2 μg/ml) and a low-vancomycin-MIC group (≤1.0 μg/ml). We examined the relationship between MIC, genotype, primary source of bacteremia, and mortality. Ninety-four patients with MRSA bacteremia, including 31 with a high vancomycin MIC and 63 with a low MIC were analyzed. There was no significant difference between the presence of agr dysfunction and SCCmec type between the two groups. A higher vancomycin MIC was not found to be associated with mortality. In contrast, high-risk bloodstream infection sources (hazard ratio [HR], 4.63; 95% confidence interval [CI] = 1.24 to 17.33) and bacterial eradication after treatment (HR, 0.06; 95% CI = 0.02 to 0.17), irrespective of vancomycin MIC, were predictors of all-cause 30-day mortality. Our study suggests that a high-risk source of bacteremia is likely to be associated with unfavorable clinical outcomes, but a high vancomycin MIC in a susceptible range, as well as genotype characteristics, are not associated with mortality. PMID:23979741
Piñana, José Luis; Montesinos, Pau; Martino, Rodrigo; Vazquez, Lourdes; Rovira, Montserrat; López, Javier; Batlle, Montserrat; Figuera, Ángela; Barba, Pere; Lahuerta, Juan José; Debén, Guillermo; Perez-Lopez, Cristina; García, Raimundo; Rosique, Pedro; Lavilla, Esperanza; Gascón, Adriana; Martínez-Cuadrón, David; Sanz, Miguel Ángel
Bacteremia is the most frequent infectious complication during neutropenia in patients receiving autologous hematopoietic stem cell transplantation (ASCT). The objective of this study was to analyze the incidence, characteristics, risk factors, and outcome of bacteremia during the early period after ASCT. A total of 720 patients undergoing ASCT in two observational prospective consecutive multicenter studies of the Programa Español para el Tratamiento de las Hemopatías group were analyzed. Bacteremia occurred in 20 % of patients. Coagulase-negative Staphylococcus was the most frequent (66 %) among the gram-positive agents and Escherichia coli (49 %) among the gram-negative agents. Multivariate analysis showed that the length of neutropenia <1 × 10(9)/L (more than 9 days) [relative risk (RR) of 2.6, p < 0.001] was the sole risk factor for overall bacteremia. We identified the length of neutropenia <1 × 10(9)/L (more than 9 days) (RR 4.98, p < 0.001) and the use of prophylactic fluoroquinolones (RR 0.46, p < 0.01) as specific risk factors for gram-negative bacteremia. Risk factors for gram-positive bacteremia were the use of total parenteral nutrition (RR 1.92, p < 0.01) and deep neutropenia (<0.1 × 10(9)/L), with duration over 5 days (RR 1.67, p < 0.027). Bacteremia showed an increased morbidity with no impact on neither overall nor infectious related mortality. The identification of such risk factors may be helpful to implement prophylactic and therapeutic risk-adapted strategies to reduce the incidence of bacteremia in ASCT.
Background Staphylococcus aureus bacteremia is a common infection associated with significant morbidity and mortality. Telavancin is a bactericidal lipoglycopeptide active against Gram-positive pathogens, including methicillin-resistant S. aureus (MRSA). We conducted a randomized, double-blind, Phase 2 trial in patients with uncomplicated S. aureus bacteremia. Methods Patients were randomized to either telavancin or standard therapy (vancomycin or anti-staphylococcal penicillin) for 14 days. Continuation criteria were set to avoid complicated S. aureus bacteremia. The primary end point was clinical cure at 84 days. Results In total, 60 patients were randomized and 58 received ≥1 study medication dose (all-treated), 31 patients fulfilled inclusion/exclusion and continuation criteria (all-treated target [ATT]) (telavancin 15, standard therapy 16), and 17 patients were clinically evaluable (CE) (telavancin 8, standard therapy 9). Mean age (ATT) was 60 years. Intravenous catheters were the most common source of S. aureus bacteremia and ~50% of patients had MRSA. A similar proportion of CE patients were cured in the telavancin (88%) and standard therapy (89%) groups. All patients with MRSA bacteremia were cured and one patient with MSSA bacteremia failed study treatment in each group. Although adverse events (AEs) were more common in the telavancin ATT group (90% vs. 72%), AEs leading to drug discontinuation were similar (7%) in both treatment arms. Potentially clinically significant increases in serum creatinine (≥1.5 mg/dl and at least 50% greater than baseline) were more common in the telavancin group (20% vs. 7%). Conclusions This study suggests that telavancin may have utility for treatment of uncomplicated S. aureus bacteremia; additional studies are warranted. (Telavancin for Treatment of Uncomplicated Staphylococcus Aureus Bacteremia (ASSURE); NCT00062647). PMID:24884578
Bodro, Marta; Sabé, Núria; Tubau, Fe; Lladó, Laura; Baliellas, Carme; Roca, Josep; Cruzado, Josep Maria; Carratalà, Jordi
Although infections due to the six ESKAPE pathogens have recently been identified as a serious emerging problem, information regarding bacteremia caused by these organisms in solid-organ transplant (SOT) recipients is lacking. We sought to determine the frequency, risk factors, and outcomes of bacteremia due to drug-resistant ESKAPE (rESKAPE) organisms in liver, kidney, and heart adult transplant recipients. All episodes of bacteremia prospectively documented in hospitalized SOT recipients from 2007 to 2012 were analyzed. Of 276 episodes of bacteremia, 54 (19.6%) were due to rESKAPE strains (vancomycin-resistant Enterococcus faecium , methicillin-resistant Staphylococcus aureus , extended-spectrum β-lactamase-producing Klebsiella pneumoniae , carbapenem-resistant Acinetobacter baumannii , carbapenem- and quinolone-resistant Pseudomonas aeruginosa , and derepressed chromosomal β-lactam and extended-spectrum β-lactamase-producing Enterobacter species ). Factors independently associated with rESKAPE bacteremia were prior transplantation, septic shock, and prior antibiotic therapy. Patients with rESKAPE bacteremia more often received inappropriate empirical antibiotic therapy than the others (41% vs. 21.6%; P=0.01). Overall case-fatality rate (30 days) was higher in patients with rESKAPE bacteremia (35.2% vs. 14.4%; P=0.001). Bacteremia due to rESKAPE pathogens is frequent in SOT recipients and causes significant morbidity and mortality. rESKAPE organisms should be considered when selecting empirical antibiotic therapy for hospitalized SOT recipients presenting with septic shock, particularly those with prior transplantation and antibiotic use.
Caballero-Granado, Francisco Javier; Cisneros, J. M.; Luque, R.; Torres-Tortosa, M.; Gamboa, F.; Díez, F.; Villanueva, J. L.; Pérez-Cano, R.; Pasquau, J.; Merino, D.; Menchero, A.; Mora, D.; López-Ruz, M. A.; Vergara, A.; Infecciosas, for the Grupo Andaluz Para El Estudio De Las Enfermedades
A prospective, multicenter study was carried out over a period of 10 months. All patients with clinically significant bacteremia caused by Enterococcus spp. were included. The epidemiological, microbiological, clinical, and prognostic features and the relationship of these features to the presence of high-level resistance to gentamicin (HLRG) were studied. Ninety-three patients with enterococcal bacteremia were included, and 31 of these cases were caused by HLRG (33%). The multivariate analysis selected chronic renal failure, intensive care unit stay, previous use of antimicrobial agents, and Enterococcus faecalis species as the independent risk factors that influenced the development of HLRG. The strains with HLRG showed lower levels of susceptibility to penicillin and ciprofloxacin. Clinical features (except for chronic renal failure) were similar in both groups of patients. HLRG did not influence the prognosis for patients with enterococcal bacteremia in terms of either the crude mortality rate (29% for patients with bacteremia caused by enterococci with HLRG and 28% for patients not infected with strains with HLRG) or the hospital stay after the acquisition of enterococcal bacteremia. Hemodynamic compromise, inappropriate antimicrobial therapy, and mechanical ventilation were revealed in the multivariate analysis to be the independent risk factors for mortality. Prolonged hospitalization was associated with the nosocomial acquisition of bacteremia and polymicrobial infections. PMID:9466769
Marzec, Natalie S; Bessesen, Mary T
The risk of nosocomial methicillin-sensitive Staphylococcus aureus bacteremia in patients with nasal colonization on admission is 3-fold higher than in patients who are not colonized. Limited data on this question have been reported for methicillin-resistant S aureus (MRSA). This is an observational cohort study of patients admitted to a tertiary care medical center from October 1, 2007-September 30, 2013, who underwent active screening for nasal colonization with MRSA. There were 29,371 patients who underwent screening for nasal MRSA colonization; 3,262 (11%) were colonized with MRSA. There were 32 cases of MRSA bacteremia among colonized patients, for an incidence of 1%. Thirteen cases of bacteremia occurred in non-MRSA-colonized patients, for an incidence of 0.05%. The odds of developing MRSA bacteremia for patients who were nasally colonized with MRSA compared with those who were not colonized were 19.89. There was no difference between colonized and noncolonized subjects with bacteremia in all-cause mortality at 30 days or 1 year. In a setting with active screening for MRSA, the risk of MRSA bacteremia is 19.89-fold higher among colonized than noncolonized patients. Published by Elsevier Inc.
Noskin, G A; Clarke, J T
Recurrent nontyphoid salmonella septicemia is one of the opportunistic infections characteristic of AIDS. The increased incidence of severe salmonellosis in immunocompromised patients is due, in part, to defective cellular immunity. The literature contains reports of nine cases of extraintestinal Salmonella arizonae infections in patients ingesting rattlesnake capsules, all of whom had known underlying medical illnesses. We describe a previously healthy Hispanic man who developed S. arizonae bacteremia as his initial manifestation of infection with the human immunodeficiency virus (HIV). The patient ultimately stated that he had consumed rattlesnake meat for medicinal purposes--a relatively common practice among Hispanics. S. arizonae was cultured from the powder of all capsules remaining in his possession. To our knowledge, this represents the first reported case of S. arizonae bacteremia as the presenting manifestation of HIV infection following the ingestion of capsules containing rattlesnake meat.
Lopardo, H; Mastroianni, A; Casimir, L
The presence of Granulicatella spp. in bacteremic episodes of neutropenic patients was recently highlighted whereas Abiotrophia defectiva, was only isolated in cases of infectious endocarditis. The aim of this study is to describe a case of A.defectiva bacteremia in a leukemic and febrile (40 degrees C) neutropenic (200 GB/mm3) boy. A.defectiva was only isolated from one of the two processed blood samples. Although the patient was undergoing an episode of varicela which could have accounted as the possible cause of fever, A. defectiva was considered a significant finding because this species is not part of the commensal skin flora. This case suggests that both A. defectiva and Granulicatella spp. should be regarded as possible causes of bacteremia in immunocompromised patients.
Lorente, L; Jiménez, A; García, C; Galván, R; Castedo, J; Martín, M M; Mora, M L
The objective of this prospective observational study was to determine the influence of femoral and central internal jugular venous catheters on the incidence of catheter-related bacteremia (CRB). We included patients admitted to a 12-bed polyvalent medico-surgical intensive care unit over 4 years who received one or more femoral or central internal jugular venous catheters. We diagnosed 16 cases of CRB in 208 femoral catheters and 22 in 515 central internal jugular venous catheters. We found a higher incidence of CRB with femoral (9.52 per 1,000 catheter days) than with central internal jugular venous access (4.83 per 1,000 catheter days; risk ratio = 1.93; 95% confidence interval: 1.03-3.73; P = 0.04). Central internal jugular venous access could be considered a safer route of venous access than femoral access in minimizing the risk of central venous catheter-related bacteremia.
Ko, Wen-Chien; Paterson, David L.; Sagnimeni, Anthanasia J.; Hansen, Dennis S.; Von Gottberg, Anne; Mohapatra, Sunita; Casellas, Jose Maria; Goossens, Herman; Mulazimoglu, Lutfiye; Trenholme, Gordon; Klugman, Keith P.; McCormack, Joseph G.
We initiated a worldwide collaborative study, including 455 episodes of bacteremia, to elucidate the clinical patterns of Klebsiella pneumoniae. Historically, community-acquired pneumonia has been consistently associated with K. pneumoniae. Only four cases of community-acquired bacteremic K. pneumoniae pneumonia were seen in the 2-year study period in the United States, Argentina, Europe, or Australia; none were in alcoholics. In contrast, 53 cases of bacteremic K. pneumoniae pneumonia were observed in South Africa and Taiwan, where an association with alcoholism persisted (p=0.007). Twenty-five cases of a distinctive syndrome consisting of K. pneumoniae bacteremia in conjunction with community-acquired liver abscess, meningitis, or endophthalmitis were observed. A distinctive form of K. pneumoniae infection, often causing liver abscess, was identified, almost exclusively in Taiwan. PMID:11897067
Olson, Joshua; Yim, Juwon; Singh, Niedita B.; Kumaraswamy, Monika; Quach, Diana T.; Rybak, Michael J.; Pogliano, Joseph; Nizet, Victor
Ertapenem and cefazolin were used in combination to successfully clear refractory methicillin-susceptible Staphylococcus aureus (MSSA) bacteremia. In addition, recent work has demonstrated activity of combination therapy with beta-lactams from different classes against methicillin-resistant S. aureus (MRSA). The ertapenem-plus-cefazolin combination was evaluated for synergy in vitro and in vivo in a murine skin infection model using an index MSSA bloodstream isolate from a patient in whom persistent bacteremia was cleared with this combination and against a cadre of well-described research strains and clinical strains of MSSA and MRSA. Against the index MSSA bloodstream isolate, ertapenem and cefazolin showed synergy using both checkerboard (fractional inhibitory concentration [FIC] index = 0.375) and time-kill assays. Using a disk diffusion ertapenem potentiation assay, the MSSA isolate showed a cefazolin disk zone increased from 34 to 40 mm. In vitro pharmacokinetic/pharmacodynamic modeling at clinically relevant drug concentrations demonstrated bactericidal activity (>3 log10-CFU/ml reduction) of the combination but bacteriostatic activity of ether drug alone at 48 h. A disk diffusion potentiation assay showed that ertapenem increased the cefazolin zone of inhibition by >3 mm for 34/35 (97%) MSSA and 10/15 (67%) MRSA strains. A murine skin infection model of MSSA showed enhanced activity of cefazolin plus ertapenem compared to monotherapy with these agents. After successful use in clearance of MSSA bacteremia, the combination of ertapenem and cefazolin showed synergy against MSSA in vitro and in vivo. This combination may warrant consideration for future clinical study in MSSA bacteremia. PMID:27572414
Tang, Hung-Jen; Chen, Chi-Chung; Ko, Wen-Chien
Non-typhoid Salmonella species represent a significant cause of aortitis. Few antimicrobial agents can be used when the patient is allergic or intolerable to cephalosporins or fluoroquinolones. Here, we report a case of bacteremia and aortitis caused by Salmonella enterica serotype Choleraesuis. This patient was cured by initial parenteral tigecycline and subsequent oral ciprofloxacin without surgical intervention. Copyright © 2012. Published by Elsevier B.V.
Sakoulas, George; Olson, Joshua; Yim, Juwon; Singh, Niedita B; Kumaraswamy, Monika; Quach, Diana T; Rybak, Michael J; Pogliano, Joseph; Nizet, Victor
Ertapenem and cefazolin were used in combination to successfully clear refractory methicillin-susceptible Staphylococcus aureus (MSSA) bacteremia. In addition, recent work has demonstrated activity of combination therapy with beta-lactams from different classes against methicillin-resistant S. aureus (MRSA). The ertapenem-plus-cefazolin combination was evaluated for synergy in vitro and in vivo in a murine skin infection model using an index MSSA bloodstream isolate from a patient in whom persistent bacteremia was cleared with this combination and against a cadre of well-described research strains and clinical strains of MSSA and MRSA. Against the index MSSA bloodstream isolate, ertapenem and cefazolin showed synergy using both checkerboard (fractional inhibitory concentration [FIC] index = 0.375) and time-kill assays. Using a disk diffusion ertapenem potentiation assay, the MSSA isolate showed a cefazolin disk zone increased from 34 to 40 mm. In vitro pharmacokinetic/pharmacodynamic modeling at clinically relevant drug concentrations demonstrated bactericidal activity (>3 log10-CFU/ml reduction) of the combination but bacteriostatic activity of ether drug alone at 48 h. A disk diffusion potentiation assay showed that ertapenem increased the cefazolin zone of inhibition by >3 mm for 34/35 (97%) MSSA and 10/15 (67%) MRSA strains. A murine skin infection model of MSSA showed enhanced activity of cefazolin plus ertapenem compared to monotherapy with these agents. After successful use in clearance of MSSA bacteremia, the combination of ertapenem and cefazolin showed synergy against MSSA in vitro and in vivo This combination may warrant consideration for future clinical study in MSSA bacteremia. Copyright © 2016 Sakoulas et al.
Byun, Jongkyu; Yang, John Jeongseok
Herein, we describe a bacteremia caused by Neisseria gonorrhoeae that presented as liver abscesses. The patient had no risk factors for disseminated gonococcal infection. Periodic fever, skin rashes, and papules were present and the results of an abdominal computed tomography scan indicated the presence of small liver abscesses. The results of blood culture and 16S rRNA sequencing of the bacterial isolates confirmed the presence of N. gonorrhoeae. The patient improved with antibiotic therapy. PMID:25844265
Kim, Kyong-Young; Hur, Jaehyung; Jo, Wonyong; Hong, Jeongmin; Cho, Oh-Hyun; Kang, Dong Ho; Kim, Sunjoo
Roseomonas are a gram-negative bacteria species that have been isolated from environmental sources. Human Roseomonas infections typically occur in immunocompromised patients, most commonly as catheter-related bloodstream infections. However, Roseomonas infections are rarely reported in immunocompetent hosts. We report what we believe to be the first case in Korea of infectious spondylitis with bacteremia due to Roseomonas mucosa in an immunocompetent patient who had undergone vertebroplasty for compression fractures of his thoracic and lumbar spine. PMID:26483995
Chávez, A C; Barrera, S; Leon, A; Trueba, G
Campylobacter fetus is an opportunistic pathogen which causes bacteremia and other invasive infections in immunocompromised patients who have been exposed to livestock or ingested animal products (uncooked meat or unpasteurized milk). The present report describes a C. fetus infection in a healthy adult (immunocompetent) who returned from a visit to the Ecuadorian Amazonia and who did not report exposure to the typical sources of infection.
Valliant, Amanda M; Chaudhry, Muhammad K; Yevzlin, Alexander S; Astor, Brad; Chan, Micah R
Tunneled dialysis catheters are the most common form of vascular access among incident dialysis patients in the United States. Fibrin sheath formation is a frequent cause of late catheter dysfunction requiring an exchange procedure with balloon disruption of the fibrin sheath. It is unknown whether fibrin sheath disruption is associated with increased incidence of bacteremia or catheter failure. We reviewed all tunneled dialysis catheter exchange procedures at the University of Wisconsin between January 2008 and December 2011. The primary outcome was incidence of bacteremia, defined as positive blood cultures within 2 weeks of the procedure. Catheter failure, requiring intervention or replacement, was examined as a secondary outcome. Baseline characteristics examined included diabetic status, gender, race and age. A total of 163 procedures were reviewed; 67 (41.1%) had fibrin sheath disruption and 96 did not. Bacteremia occurred in 4.5% (3/67) of those with and 3.1% (3/97) of those without fibrin sheath disruption (p=0.65). Fibrin sheath disruption was not significantly associated with the risk of catheter failure (adjusted hazard ratio [aHR]=1.34; 95% confidence interval [CI]: 0.87-2.10; p=0.18). Diabetes was associated with greater risk of catheter failure (aHR=1.88; 95% CI: 1.19-2.95; p=0.006), whereas higher age was associated with a lower risk of catheter failure (aHR per 10 years=0.83; 95% CI: 0.72-0.96; p=0.01). This study demonstrates that there is no significant increase in bacteremia and subsequent catheter dysfunction rates after fibrin sheath disruption compared to simple over the wire exchange. These results are encouraging given the large numbers of patients utilizing tunneled catheters for initial hemodialysis access and the known rates of fibrin sheath formation leading to catheter failure.
De Baere, Thierry; Breyne, Joke; De Laere, Emmanuel; Mariën, Stan; Waets, Peter; Laffut, Wim
Pseudoclavibacter spp. are Gram-positive, aerobic, catalase-positive, coryneform bacteria belonging to the family of Microbacteriaceae. Identification of these species with conventional biochemical assays is difficult. This case report of a Pseudoclavibacter bifida bacteremia occurring in an immunocompromised host diagnosed with an acute exacerbation of chronic obstructive pulmonary disease, with a lethal outcome, confirms that this organism may be a human pathogen. PMID:23536403
Lai, C-C; Tan, C-K; Chou, C-H; Hsu, H-L; Huang, Y-T; Liao, C-H; Hsueh, P-R
The Legionella species is an important cause of communityand hospital-acquired pneumonia. Bacteremic pneumonia caused by L. pneumophila is rarely reported. We describe the first reported case of hospital-acquired pneumonia and bacteremia caused by L. pneumophila from Taiwan in a patient with idiopathic thrombocytopenic purpura who received steroid treatment. The patient was successfully treated with ceftazidime and clindamycin initially, followed by ciprofloxacin for 14 days. The blood isolate was further confirmed by 16S rDNA sequence analysis.
Büyükcam, Ayşe; Karadağ Öncel, Eda; Özsürekçi, Yasemin; Cengiz, Ali B; Kuşkonmaz, Barış; Sancak, Banu
Multiple-drug-resistant enterococcal infections canbe a serious problem in pediatric patients particularly concomitance with severe underlying diseases and lead to significant morbidity and mortality. The treatment options in children are limited compared with adults. We report a 3-year old-boy with acute myeloid leukemia (AML)-M7 and vancomycin-resistant enterococcus bacteremia successfully treated with daptomycin. Daptomycin may be an alternative therapy for VRE infections in children; more studies are needed for extended usage.
Ismi, Onur; Ozcan, Cengiz; Vayısoğlu, Yusuf; Öztürk, Candan; Tek, Sebahat Aslan; Görür, Kemal
Although effects of Merocel(®) nasal packs and silicone splints on nasal flora alterations and bacteremia formation after septoplasty were assessed before, the effect of transseptal suturing technique has not been studied yet. The objective of this study is to compare nasal flora alterations and bacteremia occurrence rates between Merocel packs, silicone splints, and transseptal suturing technique in septoplasty. Ninety patients were divided into three groups randomly: Merocel packing (Group M), silicone splint (Group S), and transseptal suturing without packing (Group T). Group M and S received prophylactic antibiotics and antibiotic pomade application to packs, whereas neither antibiotic prophylaxis nor topical pomade was applied to Group T. Preoperative, after pack removal and 1 month after pack removal nasal swab cultures and preoperative, immediately after surgery and 24 h after surgery blood cultures were taken from all patients. Group M increased Methicillin-sensitive Staphylococcus aureus (MSSA) colonization (p = 0.003) and decreased normal flora colonization (p = 0.038), whereas Group S and T did not affect MSSA or normal flora colonization (p > 0.05). Antibiotic prophylaxis did not affect MSSA colonization (p = 0.14), whereas decreased normal flora colonization (p = 0.029). Transseptal suturing did not prevent bacteremia formation. Postoperative increasing of MSSA colonization in nasal cavity for septoplasty patients can be prevented by using transseptal suturing technique or silicone splints instead of Merocel packing, rather than applying prophylactic antibiotic treatment. Using transseptal suturing does not prevent bacteremia formation during septal surgery. These findings should be kept in mind to prevent postoperative life-threatening infective complications of septoplasty especially in immunosuppressive patients and patients with cardiovascular diseases.
Cheng, Vincent C C; Chen, Jonathan H K; Leung, Sally S M; So, Simon Y C; Wong, Shuk-Ching; Wong, Sally C Y; Tse, Herman; Yuen, Kwok-Yung
A high seasonal incidence of Bacillus bacteremia was associated with the use of contaminated hospital linens. An outbreak investigation was conducted to study the incidence and source of Bacillus bacteremia during the baseline, outbreak, and postoutbreak period from 1 January 2012 through 31 July 2016 at a university-affiliated teaching hospital in Hong Kong. Replicate organism detection and counting plates were used for microbial screening of linen samples. The Bacillus species isolated from patient and linen samples were identified by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and were phylogenetically analyzed. During the study period, a total of 113 207 blood cultures were collected from 43 271 patients, of which 978 (0.86%) specimens from 744 (1.72%) patients were identified as Bacillus species. The incidence of Bacillus bacteremia per 10 000 patient admissions and per 10 000 patient-days was significantly higher during the summer outbreak as compared with baseline and 1 year postoutbreak after cessation of the linen supply from the designated laundry and change of laundry protocol (39.97 vs 18.21 vs 2.27; 13.36 vs 5.61 vs 0.73; P < .001). The mean total aerobic bacterial count per 100 cm2 was significantly higher among the 99 linen samples screened during the outbreak period compared to the 100 screened in the postoutbreak period (916.0 ± 641.6 vs 0.6 ± 1.6; P < .001). Blood culture isolates of Bacillus cereus group in 14 of 87 (16.1%) patients were phylogenetically associated with 9 linen sample isolates. Suboptimal conditions of hospital laundry contributed to the seasonal outbreak of Bacillus bacteremia.
Patel, Krunal; Gittens-Williams, Lisa; Apuzzio, Joseph J.; Martimucci, Kristina; Williams, Shauna F.
Background. Salmonella enterica serotype Typhi (S. Typhi) is an anaerobic gram-negative enteric rod that causes infection when contaminated food or water is ingested and may cause illness in pregnancy. Case. This is a patient who presented at 31 weeks' gestation with abdominal pain and fever and was diagnosed with S. Typhi bacteremia. Conclusion. S. Typhi should be considered in febrile patients with recent travel presenting with abdominal discomfort with or without elevated liver enzymes. PMID:28203469
Townsend, Jennifer; Pelletier, Jamie; Peterson, Gail; Matulevicius, Susan; Sreeramoju, Pranavi
The purpose of this study is to improve the quality of care and patient outcomes for Staphylococcus aureus bacteremia. A quasi-experimental pre- and postintervention study design was used to compare process and clinical endpoints before and after a quality-improvement initiative. All inpatients >18 years of age with a positive blood culture for S. aureus during the specified pre- and postintervention period with clinical information available in the electronic medical record were included. An institutional protocol for the care of patients with S. aureus bacteremia was developed, formalized, and distributed to providers using a pocket card, an electronic order set, and targeted lectures over a 9-month period. There were 167 episodes of S. aureus bacteremia (160 patients) identified in the preintervention period, and 127 episodes (123 patients) in the postintervention period. Guideline adherence improved in the postintervention period for usage of transesophageal echocardiogram (43.9% vs 20.2%, P <.01) and adequate duration of intravenous therapy (71% vs 60%, P = .05). In a multivariate Cox proportional hazard model, the variables associated with increased relapse-free survival were postintervention period (hazard ratio [HR] 0.48; confidence interval [CI], 0.24-0.95; P .035) and appropriate source control (HR 0.53; CI, 0.24-0.92; P .027). Regardless of intervention, presence of cancer was associated with an increased risk of relapse or mortality at 90 days (HR 2.88; P <.0001; CI, 1.35-5.01). A bundled educational intervention to promote adherence to published guidelines for the treatment of S. aureus bacteremia resulted in a significant improvement in provider adherence to guidelines as well as increased 90-day relapse-free survival. Copyright © 2016 Elsevier Inc. All rights reserved.
Gollol-Raju, Narasimha Swamy
Gemella species are part of normal human flora. They are rarely associated with infections. As opportunistic pathogens, they can cause life-threatening infection in individuals with risk factors. We present an unusual case of an elderly patient, with no predisposing risk factors, who presented with respiratory tract infection and Gemella species bacteremia and suffered a stroke in the absence of features of endocarditis. PMID:28115939
Espinosa-Camacho, Luis F; Delgado, Gabriela; Miranda-Novales, Guadalupe; Soberón-Chávez, Gloria; Alcaraz, Luis D; Morales-Espinosa, Rosario
Two Pseudomonas aeruginosa strains isolated from children with bacteremia in Mexico City were sequenced using PacBio RS-II single-molecule real-time (SMRT) technology. The strains consist of a 7.0- to 7.4-Mb chromosome, with a high content of mobile elements, and variation in the genetic content of class 1 integron In1409. Copyright © 2017 Espinosa-Camacho et al.
Chou, Hsien-Ling; Han, Shih-Tsung; Yeh, Chun-Fu; Tzeng, I-Shaing; Hsieh, Tsung-Han; Wu, Chin-Chieh; Kuan, Jen-Tse; Chen, Kuan-Fu
Early diagnosis of bacteremia for patients with suspected sepsis is 1 way to improve prognosis of sepsis. Systemic inflammatory response syndrome (SIRS) has long been utilized as a screening tool to detect bacteremia by front-line healthcare providers. The value of SIRS to predict bacteremia in elderly patients (≥65 years) with suspected sepsis has not yet been examined in emergency departments (EDs).We aimed to evaluate the performance of SIRS components in predicting bacteremia among elderly patients in EDs.We retrospectively evaluated patients with suspected sepsis and 2 sets of blood culture collected within 4 hours after admitting to ED in a tertiary teaching hospital between 2010 and 2012. Patients were categorized into 3-year age groups: young (18-64 years), young-old (65-74 years), and old patients (≥75 years). Vital signs and Glasgow Coma Scale with verbal response obtained at the triage, comorbidities, sites of infection, blood cultures, and laboratory results were retrieved via the electronic medical records.A total of 20,192 patients were included in our study. Among them, 9862 (48.9%) were the elderly patients (young-old and old patients), 2656 (13.2%) developed bacteremia. Among patients with bacteremia, we found the elderly patients had higher SIRS performance (adjusted odds ratio [aOR]: 2.40, 95% confidence interval [CI]: 1.90-3.03 in the young-old and aOR: 2.66, 95% CI: 2.19-3.23 in the old). Fever at the triage was most predictive of bacteremia, especially in the elderly patients (aOR: 2.19, 95% CI: 1.81-2.65 in the young-old and aOR: 2.27, 95% CI: 1.95-2.63 in the old), and tachypnea was not predictive of bacteremia among the elderly patients (all P > 0.2).The performance of SIRS to predict bacteremia was more suitable for elderly patients in EDs observed in this study. The elderly patients presented with more fever and less tachypnea when they had bacteremia.
Chou, Hsien-Ling; Han, Shih-Tsung; Yeh, Chun-Fu; Tzeng, I-Shaing; Hsieh, Tsung-Han; Wu, Chin-Chieh; Kuan, Jen-Tse; Chen, Kuan-Fu
Abstract Early diagnosis of bacteremia for patients with suspected sepsis is 1 way to improve prognosis of sepsis. Systemic inflammatory response syndrome (SIRS) has long been utilized as a screening tool to detect bacteremia by front-line healthcare providers. The value of SIRS to predict bacteremia in elderly patients (≥65 years) with suspected sepsis has not yet been examined in emergency departments (EDs). We aimed to evaluate the performance of SIRS components in predicting bacteremia among elderly patients in EDs. We retrospectively evaluated patients with suspected sepsis and 2 sets of blood culture collected within 4 hours after admitting to ED in a tertiary teaching hospital between 2010 and 2012. Patients were categorized into 3-year age groups: young (18–64 years), young-old (65–74 years), and old patients (≥75 years). Vital signs and Glasgow Coma Scale with verbal response obtained at the triage, comorbidities, sites of infection, blood cultures, and laboratory results were retrieved via the electronic medical records. A total of 20,192 patients were included in our study. Among them, 9862 (48.9%) were the elderly patients (young-old and old patients), 2656 (13.2%) developed bacteremia. Among patients with bacteremia, we found the elderly patients had higher SIRS performance (adjusted odds ratio [aOR]: 2.40, 95% confidence interval [CI]: 1.90–3.03 in the young-old and aOR: 2.66, 95% CI: 2.19–3.23 in the old). Fever at the triage was most predictive of bacteremia, especially in the elderly patients (aOR: 2.19, 95% CI: 1.81–2.65 in the young-old and aOR: 2.27, 95% CI: 1.95–2.63 in the old), and tachypnea was not predictive of bacteremia among the elderly patients (all P > 0.2). The performance of SIRS to predict bacteremia was more suitable for elderly patients in EDs observed in this study. The elderly patients presented with more fever and less tachypnea when they had bacteremia. PMID:27930596
Yang, Chih-Chao; Wu, Chien-Hsing; Lee, Chien-Te; Liu, Han-Tsung; Chen, Jin-Bor; Chiu, Chien-Hua; Chen, Chih-Hung; Chuang, Feng-Rong
In the face of increasing treatment options for extended-spectrum beta-lactamase-producing Klebsiella pneumoniae (ESBL-Kp) hemodialysis (HD) access-related bacteremia, the difference in clinical effectiveness between ertapenem and flomoxef remains unclear. We conducted this retrospective study to determine their efficacies and treatment outcomes. Patients on maintenance HD with fistula-, graft-, or catheter-related ESBL-Kp bacteremia were enrolled. Data related to clinical features and antibiotic treatments were collected. Outcome was determined by mortality resulting from bacteremia during the 14-day period after the collection of the first positive blood culture for flomoxef-susceptible ESBL-Kp. The 64 patients studied had severe septicemia as determined by the Pitt bacteremia score; 50% (32/64) were in the intensive care unit (ICU) at the time of bacteremia. Old age (>65 years; 57.8%), malnutrition (albumin<3.5g/dl; 92.2%), a history of severe illnesses (defined by shock, intubation, or ICU stay; 82.5%), and prolonged hospitalization prior to the onset of bacteremia (>30 days; 75%) were also highly prevalent. The study population comprised nine fistula-, 10 graft-, and 45 HD catheter-related bacteremia cases, and the mortality rate was high (38/64, 59.4%). The mortality rate was significantly higher in the flomoxef treatment group than in the ertapenem treatment group (22/30, 73% vs. 16/34, 47%, p<0.05). Among patients with catheter-related bacteremia, multivariate analyses revealed that flomoxef use (odds ratio (OR) 2.52, 95% confidence interval (CI) 1.34-35.17) and Pitt bacteremia score (OR 4.37, 95% CI 1.28-5.26) were independently associated with mortality. In accordance with our previous study, our results have demonstrated the inferiority of flomoxef to carbapenems in the treatment of HD access-related ESBL-Kp bacteremia and provide an insight into the possibility of using ertapenem rather than flomoxef as an initial or de-escalating therapy for infections
van Eck van der Sluijs, A; Oosterheert, J J; Ekkelenkamp, M B; Hoepelman, I M; Peters, Edgar J G
Although Gram-negative micro-organisms are frequently associated with catheter-related bloodstream infections, the prognostic value and clinical implication of a positive catheter tip culture with Gram-negative micro-organisms without preceding bacteremia remains unclear. We determined the outcomes of patients with intravascular catheters colonized with these micro-organisms, without preceding positive blood cultures, and identified risk factors for the development of subsequent Gram-negative bacteremia. All patients with positive intravascular catheter tip cultures with Gram-negative micro-organisms at the University Medical Center, Utrecht, The Netherlands, between 2005 and 2009, were retrospectively studied. Patients with Gram-negative bacteremia within 48 h before catheter removal were excluded. The main outcome measure was bacteremia with Gram-negative micro-organisms. Other endpoints were length of the hospital stay, in-hospital mortality, secondary complications of Gram-negative bacteremia, and duration of intensive care admission. A total of 280 catheters from 248 patients were colonized with Gram-negative micro-organisms. Sixty-seven cases were excluded because of preceding positive blood cultures, leaving 213 catheter tips from 181 patients for analysis. In 40 (19%) cases, subsequent Gram-negative bacteremia developed. In multivariate analysis, arterial catheters were independently associated with subsequent Gram-negative bacteremia (odds ratio [OR] = 5.00, 95% confidence interval [CI]: 1.20-20.92), as was selective decontamination of the digestive tract (SDD) (OR = 2.47, 95% CI: 1.07-5.69). Gram-negative bacteremia in patients who received SDD was predominantly caused by cefotaxime (part of the SDD)-resistant organisms. Mortality was significantly higher in the group with subsequent Gram-negative bacteremia (35% versus 20%, OR = 2.12, 95% CI: 1.00-4.49). Patients with a catheter tip colonized with Gram-negative micro-organisms had a high chance of
Ijyuuin, Toshiro; Umehara, Fujio
A 73-year old man was brought to our hospital because of acute onset of fever and consciousness disturbance. He had been hemodialyzed three times a week because of chronic renal failure since 13 years ago. Neurological examination revealed deteriorated consciousness and neck stiffness. A lumbar puncture yielded clouded fluid with a WBC 7,912/mm³ (polymorphonuclear cells 88%, mononuclear cells 12%), 786 mg/dl of protein and 4 mg/dl of glucose (blood glucose 118 mg/dl). Brain CT and MRI were unremarkable. He was treated with ceftriaxone and ampicillin. Streptococcus salivarius was isolated from the blood sample, but not from cerebrospinal fluid. The patient responded promptly to antibiotics therapy (ampicillin 3g/day, ceftriaxone 1g/day), and within several days he became lucid and afebrile. Isolated S. salivarius was sensitive for ampicillin and ceftriaxone. We diagnosed this case as S. salivarius bacteremia/meningoencephalitis. A gastrointestinal diagnostic workup revealed an asymptomatic gastric adenocarcinoma. S. salivarius is a common inhabitant of the oral mucosa that has been associated with infection in different sites. Meningeal infection by S. salivarius generally related to neoplasia of colon or iatrogenia, has been described on few occasions. This is the first report of S. salivarius bacteremia/meningoencephalitis associated with gastric neoplasm. Neurologist should be aware of the association of S. salivarius bacteremia/meningoencephalitis and gastrointestinal disease.
Urbonas, Vincas; Eidukaitė, Audronė; Tamulienė, Indrė
Early diagnosis of bacteremia and sepsis in pediatric oncology patients with febrile neutropenia still remains unresolved task due to lack of sensitive and specific laboratory markers particularly at the beginning of the infectious process. The objective of our study was to assess the potentiality of interleukin-10 (IL-10) to predict or exclude bacteremia or sepsis at the beginning of febrile episode in childhood oncology patients. A total of 36 febrile neutropenic episodes in 24 children were studied. Serum samples were collected after confirmation of febrile neutropenia and analyzed using automated random access analyzer. The sensitivity of IL-10 was 73% and specificity - 92% (cut-off=18pg/ml, area under the curve - 0.87, 95% CI for sensitivity 39-94%, 95% CI for specificity 74-99%) with negative predictive value (NPV) - 83%. IL-10 evaluation might be used as an additional diagnostic tool for clinicians in excluding bacteremia or clinical sepsis in oncology patients with febrile neutropenia because of high NPV and specificity. Copyright © 2011 Elsevier Ltd. All rights reserved.
Shoji, Takayo; Hirai, Yuji; Osawa, Makiko; Totsuka, Kyoichi
This is a retrospective cohort study of patients who were treated with cefazolin for methicillin-susceptible Staphylococcus aureus bacteremia, at Tokyo Women's Medical University Hospital between January 2006 and December 2010. During the study period, 84/140 (60%) patients received cefazolin (mean age, 54 years; range, 0-94 years, male patients 64%). Of these, 60/84 (71%) cases were hospital acquired infections, 55/84 (65%) had heart disease, and 19/84 (23%) had moderate to severe heart failure (New York Heart Association class III/IV). The treatment failure rate at 12 weeks was 35% (n = 29). All-cause mortality were 15% (n = 13) after 12 weeks and 21% (n = 18) after a year. Secondary endocarditis and neurological events were observed in 10% (n = 8) and 2% (n = 2). Moderate to severe heart failure and retained intravascular devices were associated with treatment failure at 12 weeks by multivariate analysis (P < 0.01, P = 0.018). Our results suggest that hospital-acquired methicillin-susceptible S. aureus bacteremia can cause severe complications in patients with moderate to severe heart failure who retain their intravascular devices. Both effective antimicrobial therapy and removal of infected foci are essential for S. aureus bacteremia treatments. Copyright © 2013. Published by Elsevier Ltd.
Hansford, Jordan R; Phillips, Marianne; Cole, Catherine; Francis, Joshua; Blyth, Christopher C; Gottardo, Nicholas G
Bacillus cereus can cause serious infections in immunosuppressed patients. This population may be susceptible to B. cereus pneumonia, bacteremia, cellulitis, and rarely cerebral abscess. Here we report an 8-year-old boy undergoing induction therapy for acute lymphoblastic leukemia who developed multifocal B. cereus cerebral abscesses, highlighting the propensity for B. cereus to develop cerebral abscesses. A review of the literature over the past 25 years identified another 11 cases (3 children and 8 adults) of B. cereus cerebral abscess in patients undergoing cancer therapy. B. cereus cerebral abscesses were associated with a high mortality rate (42%) and significant morbidity. Notably, B. cereus bacteremia with concomitant cerebral abscess was associated with induction chemotherapy for acute leukemia in both children and adults (10 of 12 case reports). Our case report and review of the literature highlights the propensity for B. cereus to develop cerebral abscess(es). Therefore, early consideration for neuroimaging should be given for any neutropenic cancer patient identified with B. cereus bacteremia, in particular those with acute leukemia during induction therapy.
Hollis, A R; Wilkins, P A; Palmer, J E; Boston, R C
Bacteremia in sick foals is associated with survival, but the association of bacteremia and diarrhea is not reported. Neonatal foals with diarrhea will commonly be bacteremic. One hundred and thirty-three neonatal foals. Records of all foals <30 days of age presenting with diarrhea between January 1990 and September 2007 were reviewed. Sixty-six of 133 foals (50%) were bacteremic at admission, with 75 isolates from the 66 samples. The blood culture from a further 18 foals (13.5%) grew coryneform bacteria. Nine foals (6.8%) had 2 or more organisms grown on blood culture. One foal had 5 different organisms, interpreted as contamination. Forty-eight foals (36%) had no growth on admission blood cultures. No cultures isolated fungal organisms. Excluding coryneform bacteria, 43 isolates (57%) were Gram-negative organisms and 32 isolates (43%) were Gram-positive organisms. The most common isolate was Enterococcus spp. (22 isolates, 29%), followed by Pantoea agglomerans (13 isolates, 17%). IgG concentration at admission was not associated with blood culture status. Blood culture status was not associated with survival to hospital discharge. Bacteremia is common in neonatal foals with diarrhea. Decisions regarding antimicrobial selection should be made with these differences in mind.
Liu, Haiyan; Cheng, Zhongle; Song, Wen; Wu, Wenyong; Zhou, Zheng
Incidences of leukopenia caused by bacteremia have increased significantly and it is associated with prolonged hospital stay and increased cost. Immunoproteomic is a promising method to identify pathogenicity factors of different diseases. In the present study, we used immunoproteomic to analysis the pathogenicity factors in leukopenia caused by Klebsiella Pneumonia bacteremia. Approximately 40 protein spots localized in the 4 to 7 pI range were detected on two-dimensional electrophoresis gels, and 6 differentially expressed protein spots between 10 and 170 kDa were identified. Pathogenicity factors including S-adenosylmethionine synthetase, pyruvate dehydrogenase, glutathione synthetase, UDP-galactose-4-epimerase, acetate kinase A and elongation factor tu (EF-Tu). In validation of the pathogenicity factor, we used western blotting to show that Klebsiella pneumonia had higher (EF-Tu) expression when they accompanied by leukopenia rather than leukocytosis. Thus, we report 6 pathogenicity factors of leukopenia caused by Klebsiella pneumonia bacteremia, including 5 housekeeping enzymes and EF-Tu. We suggest EF-Tu could be a potential pathogenicity factor for leukopenia caused by Klebsiella pneumonia. PMID:25330314
Merchant, Chandni; Villanueva, Daphne-Dominique; Lalani, Ishan; Eng, Margaret; Kang, Yong
Staphylococcus schleiferi subsp. schleiferi is a coagulase-negative Staphylococcus which has been described as a pathogen responsible for various nosocomial infections including bacteremia, brain abscess, and infection of intravenous pacemakers. Recently, such bacteria have been described to be found typically on skin and mucosal surfaces. It is also believed to be a part of the preaxillary human flora and more frequently found in men. It is very similar in its pathogenicity with Staphylococcus aureus group and expresses a fibronectin binding protein. Literature on this pathogen reveals that it commonly causes otitis among dogs because of its location in the auditory meatus of canines. Also, it has strong association with pyoderma in dogs. The prime concern with this organism is the antibiotic resistance and relapse even after appropriate treatment. Very rarely, if any, cases have been reported about prostatic abscess (PA) with this microbe. Our patient had a history of recurrent UTIs and subsequent PA resulting in S. schleiferi bacteremia in contrast to gram negative bacteremia commonly associated with UTI. This organism was found to be resistant to methicillin, in spite of being negative for PBP2, which is a rare phenomenon and needs further studies. PMID:27092283
Liu, Haiyan; Cheng, Zhongle; Song, Wen; Wu, Wenyong; Zhou, Zheng
Incidences of leukopenia caused by bacteremia have increased significantly and it is associated with prolonged hospital stay and increased cost. Immunoproteomic is a promising method to identify pathogenicity factors of different diseases. In the present study, we used immunoproteomic to analysis the pathogenicity factors in leukopenia caused by Klebsiella Pneumonia bacteremia. Approximately 40 protein spots localized in the 4 to 7 pI range were detected on two-dimensional electrophoresis gels, and 6 differentially expressed protein spots between 10 and 170 kDa were identified. Pathogenicity factors including S-adenosylmethionine synthetase, pyruvate dehydrogenase, glutathione synthetase, UDP-galactose-4-epimerase, acetate kinase A and elongation factor tu (EF-Tu). In validation of the pathogenicity factor, we used western blotting to show that Klebsiella pneumonia had higher (EF-Tu) expression when they accompanied by leukopenia rather than leukocytosis. Thus, we report 6 pathogenicity factors of leukopenia caused by Klebsiella pneumonia bacteremia, including 5 housekeeping enzymes and EF-Tu. We suggest EF-Tu could be a potential pathogenicity factor for leukopenia caused by Klebsiella pneumonia.
Sugimoto, Naomi; Yamagishi, Yuka; Mikamo, Hiroshige
The isolation rate of extended-spectrum β-lactamase (ESBL)-producing bacteria have been increasing in Japan. While the efficacy of piperacillin/tazobactam (PIPC/TAZ) for ESBL-producing bacteria is controversial, carbapenems have generally been shown to be effective. The aim of this study was to determine whether the current Clinical and Laboratory Standards Institute susceptibility breakpoint of ≤16/4 μg/mL PIPC/TAZ predicts the clinical usefulness for bacteremia caused by ESBL-producing Enterobacteriaceae. We retrospectively investigated 35 patients with bacteremia caused by Enterobacteriaceae producing ESBLs treated with PIPC/TAZ monotherapy. The microbiological and clinical efficacy with PIPC/TAZ minimum inhibitory concentrations (MICs) of ≤16/4 μg/mL was better than that with MICs ≥ 32/4 μg/mL. In contrast, MICs ≤8/4 μg/mL showed significantly higher microbiological and clinical efficacy compared to that of MICs ≥16/4 μg/mL (P < 0.05). These results suggest that 8/4 μg/mL PIPC/TAZ MIC is recommended as a breakpoint for bacteremia caused by ESBL-producing Enterobacteriaceae in Japan, although the current CLSI breakpoint is also useful. Copyright © 2016 Japanese Society of Chemotherapy and The Japanese Association for Infectious Diseases. Published by Elsevier Ltd. All rights reserved.
Mishra, Rashmi; Duncalf, Richard
Clostridium perfringens bacteremia is associated with adverse outcomes. Known risk factors include chronic kidney disease, malignancy, diabetes mellitus, and gastrointestinal disease. We present a 74-year-old man admitted with confusion, vomiting, and abdominal pain. Exam revealed tachycardia, hypotension, lethargy, distended abdomen, and cold extremities. He required intubation and aggressive resuscitation for septic shock. Laboratory data showed leukocytosis, metabolic acidosis, acute kidney injury, and elevated lipase. CT scan of abdomen revealed acute pancreatitis and small bowel ileus. He was started on vancomycin and piperacillin-tazobactam. Initial blood cultures were positive for C. perfringens on day five. Metronidazole and clindamycin were added to the regimen. Repeat CT (day 7) revealed pancreatic necrosis. The patient developed profound circulatory shock requiring multiple vasopressors, renal failure requiring dialysis, and bacteremia with vancomycin-resistant enterococci. Hemodynamic instability precluded surgical intervention and he succumbed to multiorgan failure. Interestingly, our isolate was beta lactamase producing. We review the epidemiology, risk factors, presentation, and management of C. perfringens bacteremia. This case indicates a need for high clinical suspicion for clostridial sepsis and that extended spectrum beta lactam antibiotic coverage may be inadequate and should be supplemented with use of clindamycin or metronidazole if culture is positive, until sensitivities are known. PMID:26904307
Mileva, Sevda; Gospodinova, Margarita; Todorov, Ilian
Diseases caused by invasive nontyphoidal Salmonella strains present with various extraintestinal manifestations, including bacteremia. Factors affecting the incidence include Salmonella serotype, geographic location, and host factors. We present an unusual case of Salmonella enteritidis primary bacteremia in a patient without any risk factors and originating from a region with the lowest burden of invasive nontyphoidal Salmonella infections. We observed an incomplete clinical response to the treatment with a third-generation cephalosporin, despite the in vitro susceptibility of the strain. The diagnosis of Salmonella bacteremia was far from expected in our previously healthy patient from Taiwan, without any preceding diarrhea and the lack of marked response to therapy with ceftriaxone. Making the diagnosis was a challenge, requiring wide range of laboratory, imaging, and consultative work to rule out alternative diagnoses and complications. Invasive Salmonella infections are uncommon in our clinical practice at the present. Air transportation, intensive migration processes, and changes in climate are able to change the burden of infectious diseases dramatically in the near future. That fact along with the raising antibacterial resistance among invasive nontyphoidal Salmonella strains make imperative the profound understanding of the epidemiology and pathophysiology of those infections.
Millard, Michael A.; McManus, Kathleen A.; Wispelwey, Brian
Clostridium perfringens bacteremia is an uncommon yet serious clinical syndrome that typically arises from a gastrointestinal source. However, clinicians should consider nongastrointestinal sources as well. We present a rare case of C. perfringens bacteremia of urinary origin that required surgical intervention for definitive treatment. A 61-year-old male presented with acute nausea and vomiting, altered mental status, and chronic diarrhea. His physical exam revealed right costovertebral tenderness and his laboratory work-up revealed acute renal failure. Percutaneous blood cultures grew C. perfringens. Cross-sectional imaging revealed a right-sided ureteral stone with hydronephrosis, which required nephrostomy placement. On placement of the nephrostomy tube, purulent drainage was identified and Gram stain of the drainage revealed Gram-variable rods. A urinary source of C. perfringens was clinically supported. Although it is not a common presentation, nongastrointestinal sources such as a urinary source should be considered in C. perfringens bacteremia because failure to recognize a nongastrointestinal source can delay appropriate treatment, which may include surgical intervention. PMID:26998370
Kurihara, Yoko; Hitomi, Shigemi; Oishi, Tsuyoshi; Kondo, Tsukasa; Ebihara, Tsugio; Funayama, Yasunori; Kawakami, Yasushi
Although Proteus mirabilis is a common human pathogen, bacteremia caused by the organism, especially strains producing extended-spectrum beta-lactamase (ESBL), has rarely been investigated. We examined 64 cases of P. mirabilis bacteremia identified in the Minami Ibaraki Area, Japan, between 2001 and 2010 and compared the characteristics of cases with ESBL-producing and ESBL-non-producing strains (13 and 51 cases, respectively). All ESBL-producing strains with the gene encoding the CTX-M-2-group were genetically nonidentical. Isolation of ESBL-producing strains was significantly associated with onset in a hospital (p = 0.030), receiving hemodialysis (p = 0.0050), and previous antibiotic use within 1 month (p = 0.036; especially penicillin and/or cephalosporin (p = 0.010) and fluoroquinolone (p = 0.0069)). Isolation was also associated with inappropriate antibiotic therapy on the 1st and 4th days (p = 0.011 and 0.032, respectively) but not with mortality on the 30th day. These findings indicate that, for P. mirabilis bacteremia, isolation of ESBL-producing strains causes delay of initiating appropriate antimicrobial therapy but may not be associated with mortality.
Yawman, Daniel; Mahar, Patrick; Blumkin, Aaron; Conners, Gregory
Background. It is unclear if clinicians evaluate for concurrent bacteremia or UTI in young patients diagnosed with acute otitis media (AOM). Objectives. To describe how often, and under which circumstances, emergency providers investigate for bacteremia or UTI in 2–36 month olds with AOM. Methods. Cases of AOM were analyzed from the 2001–2004 National Hospital Ambulatory Medical Care Survey (NHAMCS)-Emergency Department dataset. Results. AOM was diagnosed in 17% of the 10,847 recorded visits of 2–36 month olds. Of these visits, laboratory testing included: CBC: 7%, Blood culture: 4%, urinalysis or urine culture: 5%, and any of these tests: 9%. Rates of testing for 2–6 month olds with temperature ≥ 38.0 (CBC: 13%, blood culture: 9%, urinalysis or urine culture: 7%, any of the tests: 14%) were not significantly different from testing of patients aged 6–12 months, or 12–36 months (all P > .1). Patients with temperature of ≥39.0 were more likely to have all tests, with the exception of urine investigation, than patients with temperature between 38.0 and 38.9. Conclusions. 17% of 2–36 month old patients seen in the emergency department are diagnosed with AOM. Investigating for bacteremia or UTI in these patients is not routine, even in febrile infants. PMID:20827307
Yawman, Daniel; Mahar, Patrick; Blumkin, Aaron; Conners, Gregory
Background. It is unclear if clinicians evaluate for concurrent bacteremia or UTI in young patients diagnosed with acute otitis media (AOM). Objectives. To describe how often, and under which circumstances, emergency providers investigate for bacteremia or UTI in 2-36 month olds with AOM. Methods. Cases of AOM were analyzed from the 2001-2004 National Hospital Ambulatory Medical Care Survey (NHAMCS)-Emergency Department dataset. Results. AOM was diagnosed in 17% of the 10,847 recorded visits of 2-36 month olds. Of these visits, laboratory testing included: CBC: 7%, Blood culture: 4%, urinalysis or urine culture: 5%, and any of these tests: 9%. Rates of testing for 2-6 month olds with temperature ≥ 38.0 (CBC: 13%, blood culture: 9%, urinalysis or urine culture: 7%, any of the tests: 14%) were not significantly different from testing of patients aged 6-12 months, or 12-36 months (all P > .1). Patients with temperature of ≥39.0 were more likely to have all tests, with the exception of urine investigation, than patients with temperature between 38.0 and 38.9. Conclusions. 17% of 2-36 month old patients seen in the emergency department are diagnosed with AOM. Investigating for bacteremia or UTI in these patients is not routine, even in febrile infants.
Nakakura, Ichiro; Ogawa, Yoshihiko; Sakakura, Kota; Imanishi, Kaori; Hirota, Kazuyuki; Shimatani, Yasuaki; Uehira, Tomoko; Nakamori, Shoji; Sako, Rumi; Doi, Toshiyuki; Yamazaki, Kunio
Infections caused by carbapenemase-producing Enterobacteriaceae (CPE) are becoming increasingly common worldwide. Although CPE infections can be fatal, few reports in the literature have described effective and successful treatments for infectious diseases caused by several types of IMP CPE, and, to our knowledge, no reports have described the successful treatment of IMP-6 CPE infections. We describe two patients who developed bacteremia caused by IMP-6 CPE after surgery for cancer who were successfully treated with amikacin plus high-dose prolonged-infusion meropenem. Both patients were treated over a 2-week period using amikacin 15 mg/kg at various intervals based on therapeutic drug monitoring and meropenem 2000 mg infused over 3 hours every 12 hours. The dosages of amikacin and meropenem were determined based on the creatinine clearance of each patient. Both patients were cured of their bacteremia and did not experience any antibiotic-related adverse effects. Based on the outcomes of these patients, it appears that amikacin plus high-dose prolonged-infusion meropenem may be safe and effective for the treatment of bacteremia caused by IMP-6 CPE. © 2017 Pharmacotherapy Publications, Inc.
Teng, Sing-On; Yen, Muh-Yong; Ou, Tsong-Yih; Chen, Fu-Lun; Yu, Fang-Lan; Lee, Wen-Sen
Acinetobacter baumannii (AB) bacteremia has increasingly emerged as a nosocomial pathogen in healthcare settings, associated with high patient morbidity and mortality. The objective of this study was to compare clinical features, risk factors, treatment outcome, and antibiotic resistance in patients with pneumonia- and non-pneumonia-related AB bacteremia. We conducted a retrospective study in a tertiary teaching hospital in northern Taiwan. The medical records of the 141 episodes of hospital-acquired AB bacteremia between July 1, 2006 and June 30, 2012 were reviewed, and sorted into groups of AB bacteremia with (n = 59) and without pneumonia (n = 82). The hospital-acquired pneumonia-related AB bacteremia group were found to be significantly more frequently treated in intensive care units (49.2%, p < 0.001), but the AB bacteremia without pneumonia group were significantly more frequently treated on general wards (85.4%, p < 0.001). Patients with pneumonia tended to be older than the nonpneumonia group (72.8 years vs. 65.2 years in mean age, p < 0.01), and more likely to use mechanical ventilators (62.7% vs. 15.9 %, p < 0.001). Pneumonia patients were found to receive broad-spectrum antibiotics significantly earlier than nonpneumonia patients (p < 0.001). Compared to those without pneumonia, the patients with pneumonia had significantly higher incidence of antibiotic-resistance (p < 0.05), longer hospital stay (p < 0.01), and higher mortality rate (p < 0.001). The incidence of multidrug-resistant AB was significantly higher in patients with pneumonia (p < 0.05), and only colistin (p < 0.01) and tigecycline (p < 0.01) were significantly active against multidrug-resistant AB isolates. Pneumonia-related AB bacteremia has a worse outcome, more antibiotic resistance, and more comorbidity than the nonpneumonia group. Copyright © 2014. Published by Elsevier B.V.
Araoka, Hideki; Baba, Masaru; Kimura, Muneyoshi; Abe, Masahiro; Inagawa, Hiroko; Yoneyama, Akiko
The aim of this study was to clarify the clinical characteristics of patients with Helicobacter cinaedi bacteremia and the time required for blood cultures to become positive. The medical records of all patients with H. cinaedi bacteremia at Toranomon Hospital and Toranomon Hospital Kajigaya between March 2009 and March 2013 were retrospectively reviewed. Sixty-three patients, 34 men and 29 women with a median age of 67 years (range, 37 to 88 years), were diagnosed with H. cinaedi bacteremia. A total of 51,272 sets of blood cultures were obtained during the study period, of which 5,769 sets of blood cultures were positive for some organism and 126 sets were H. cinaedi positive. The time required for blood cultures to become positive for H. cinaedi was ≤5 days in 69 sets (55%) and >5 days in 57 sets (45%). Most patients had an underlying disease, including chronic kidney disease (21 cases), solid tumor (19 cases), hematological malignancy (13 cases), diabetes mellitus (8 cases), chronic liver disease (6 cases), and postorthopedic surgery (3 cases). Only 1 patient had no apparent underlying disease. The clinical symptoms included cellulitis in 24 cases, colitis in 7 cases, and fever only in 27 cases, including 7 cases of febrile neutropenia. The 30-day mortality rate of H. cinaedi bacteremia was 6.3%. In conclusion, most cases of H. cinaedi bacteremia occurred in immunocompromised patients. We might have overlooked nearly half of the H. cinaedi bacteremia cases if the duration of monitored blood culture samples had been within 5 days. Therefore, when clinicians suspect H. cinaedi bacteremia, the observation period for blood cultures should be extended.
Sasaki, Sho; Hasegawa, Takeshi; Kawarazaki, Hiroo; Nomura, Atsushi; Uchida, Daisuke; Imaizumi, Takahiro; Furusho, Masahide; Nishiwaki, Hiroki; Fukuma, Shingo; Shibagaki, Yugo; Fukuhara, Shunichi
Background To our knowledge, no reliable clinical prediction rule (CPR) for identifying bacteremia in hemodialysis (HD) patients has been established. The aim of this study was to develop a CPR for bacteremia in maintenance HD patients visiting the outpatient department. Methods This multicenter cohort study involved consecutive maintenance HD patients who visited the outpatient clinic or emergency room of seven Japanese institutions between August 2011 and July 2013. The outcome measure was bacteremia diagnosed based on the results of blood cultures. The candidate predictors for bacteremia were extracted through a literature review. A CPR for bacteremia was developed using a coefficient-based multivariable logistic regression scoring method, and calibration was performed. The test performance was then assessed for the CPR. Results Of 507 patients eligible for the study, we analyzed the 293 with a complete dataset for candidate predictors. Of these 293 patients, 48 (16.4%) were diagnosed with bacteremia. At the conclusion of the deviation process, body temperature ≥ 38.3°C, heart rate ≥ 125 /min, C-reactive protein ≥ 10 mg/dL, alkaline phosphatase >360 IU/L, and no prior antibiotics use within the past week were retained and scored. The CPR had a good fit for the model on calibration. The AUC of the CPR was 0.76, and for score CPR ≥ 2, the sensitivity and specificity were 89.6% and 51.4%, respectively. Conclusions We established a simple CPR for bacteremia in maintenance HD patients using routinely obtained clinical information in an outpatient setting. This model may facilitate more appropriate clinical decision making. PMID:28081211
Takesue, Yoshio; Nakajima, Kazuhiko; Takahashi, Yoshiko; Ichiki, Kaori; Ishihara, Mika; Wada, Yasunao; Tsuchida, Toshie; Uchino, Motoi; Ikeuchi, Hiroki
Recent studies demonstrated that mortality associated with methicillin-resistant Staphylococcus aureus (MRSA) bacteremia was high when vancomycin was used to treat infections with strains that had a high vancomycin minimum inhibitory concentration (MIC). This study compared several characteristics of vancomycin MIC 2 μg/ml strains isolated from bacteremia with those isolated from infections other than bacteremia. A total of 128 episodes of MRSA bacteremia between 2005 and 2008 were followed-up, and compared with 631 MRSA infections other than bacteremia. The isolation of strains with a 2 μg/ml MIC accounted for 32.0% of isolates from MRSA bacteremia, whereas strains with a 2 μg/ml MIC comprised 9.0% of MRSA isolated from other sites (p < 0.001). The incidence of pneumonia as the source of infection was significantly higher in patients with bacteremia from strains with a 2 μg/ml MIC than in those with ≤1 μg/ml MIC. Prior vancomycin use did not correlate with the isolation of 2 μg/ml strains. The efficacy of glycopeptides as 1st line therapy in patients infected with 2 μg/ml strains was significantly lower than that for patients infected with ≤1 μg/ml strains (30.0 vs. 78.8%, p < 0.001) in bacteremia. In the analysis of infections other than bacteremia, efficacy did not reveal a significant difference according to MIC (69.0 vs. 79.6%, p = 0.109). In bacteremia, mortality was 65.8% in patients with 2 μg/ml strains and 19.5% in patients with ≤1 μg/ml strains (p < 0.001), whereas there was no significant difference in mortality from infections other than bacteremia (10.7 vs. 7.8%, p = 0.617). In multivariate analysis, bacteremia with 2 μg/ml strains, intensive care unit (ICU) stay, and liver cirrhosis were independent risk factors for death in patients with bacteremia, and initial appropriate therapy lowered the risk. Several characteristics such as a higher incidence than at other infection sites, a high incidence of pneumonia as a source of infection
Vallés, Jordi; Palomar, Mercedes; Alvárez-Lerma, Francisco; Rello, Jordi; Blanco, Armando; Garnacho-Montero, José; Martín-Loeches, Ignacio
In recent years, outcomes for critically ill patients with severe sepsis have improved; however, no data have been reported about the outcome of patients admitted for community-acquired bacteremia. We aimed to analyze the changes in the prevalence, characteristics, and outcome of critically ill patients with community-acquired bacteremia over the past 15 yrs. A secondary analysis of prospective cohort studies in critically ill patients in three annual periods (1993, 1998, and 2007). Forty-seven ICUs at secondary and tertiary care hospitals. All adults admitted to the participating ICUs with at least one true-positive blood culture finding within the first 48 hrs of admission. None. A total of 829 patients was diagnosed with community-acquired bacteremia during the study periods (148, 196, and 485 in the three periods). The prevalence density rate of community-acquired bacteremia increased from nine per 1000 ICU admissions in 1993 to 24.4 episodes per 1,000 ICU admissions in 2007 (p < 0.001). The prevalence of septic shock also increased from 4.6 episodes/1,000 admissions in 1993 to 14.6 episodes/1,000 admissions in 2007 (p < 0.001). Patients with community-acquired bacteremia were significantly older and had more comorbidities. No significant differences were observed in the presence of Gram-positive and Gram-negative micro-organisms among the three study periods. Mortality related to community-acquired bacteremia decreased over the three study periods: 42%, 32.2%, and 22.9% in 1993, 1998, and 2007, respectively (p < 0.01). The occurrence of septic shock and the number of comorbidities were independently associated with worse outcome. Appropriate antibiotic therapy and development of community-acquired bacteremia in 1998 and 2007 were independently associated with better survival. The prevalence of community-acquired bacteremia in ICU patients has increased. Despite a higher percentage of more severe and older patients, the mortality associated with community
Álvarez, R; Viñas-Castillo, L; Lepe-Jiménez, J A; García-Cabrera, E; Cisneros-Herreros, J M
The time to positivity (TTP) of blood cultures has been associated with increased mortality in bacteremia caused by several microorganisms. The aim of this study is to evaluate the relationship between TTP and prognosis, clinical presentation and extended spectrum B-lactamase (ESBL)-production in patients with Escherichia coli bacteremia. This is a retrospective observational study involving 226 adult patients with E. coli bacteremia. Data collected included underlying diseases, clinical presentation, prognosis factors, TTP, ESBL-production and outcome. Thirty-one (14%) patients had severe sepsis and 29 (13%) septic shock at presentation. Thirty-three (14%) strains were ESBL-producers. Thirty-nine (17%) patients died during admission and 17 (7.5%) within 48 hours. The median TTP was 8.3 hours (range, 0.42–76.5). It was significantly shorter in patients with septic shock (6.23 h, range 1.12–47.29 h vs. 8.51 h, range 0.42–76.50 h; p = 0.018). Rapid growth of E. coli, Pitt index >1.5, non-urinary source and Charlson score >2 were selected as independent risk factors of in-hospital mortality by the multivariate analysis. ESBL-production was not associated with modifications in TTP. Lower TTP is an independent risk factor for septic shock and poor outcome in episodes of E. coli bacteremia. The TTP in E. coli bacteremia is not significantly modified by ESBL-production.
Armbruster, Chelsie E.; Smith, Sara N.; Yep, Alejandra; Mobley, Harry L. T.
Background. Catheter-associated urinary tract infections (CaUTIs) are the most common hospital-acquired infections worldwide and are frequently polymicrobial. The urease-positive species Proteus mirabilis and Providencia stuartii are two of the leading causes of CaUTIs and commonly co-colonize catheters. These species can also cause urolithiasis and bacteremia. However, the impact of coinfection on these complications has never been addressed experimentally. Methods. A mouse model of ascending UTI was utilized to determine the impact of coinfection on colonization, urolithiasis, and bacteremia. Mice were infected with P. mirabilis or a urease mutant, P. stuartii, or a combination of these organisms. In vitro experiments were conducted to assess growth dynamics and impact of co-culture on urease activity. Results. Coinfection resulted in a bacterial load similar to monospecies infection but with increased incidence of urolithiasis and bacteremia. These complications were urease-dependent as they were not observed during coinfection with a P. mirabilis urease mutant. Furthermore, total urease activity was increased during co-culture. Conclusions. We conclude that P. mirabilis and P. stuartii coinfection promotes urolithiasis and bacteremia in a urease-dependent manner, at least in part through synergistic induction of urease activity. These data provide a possible explanation for the high incidence of bacteremia resulting from polymicrobial CaUTI. PMID:24280366
Rautanen, Anna; Pirinen, Matti; Mills, Tara C; Rockett, Kirk A; Strange, Amy; Ndungu, Anne W; Naranbhai, Vivek; Gilchrist, James J; Bellenguez, Céline; Freeman, Colin; Band, Gavin; Bumpstead, Suzannah J; Edkins, Sarah; Giannoulatou, Eleni; Gray, Emma; Dronov, Serge; Hunt, Sarah E; Langford, Cordelia; Pearson, Richard D; Su, Zhan; Vukcevic, Damjan; Macharia, Alex W; Uyoga, Sophie; Ndila, Carolyne; Mturi, Neema; Njuguna, Patricia; Mohammed, Shebe; Berkley, James A; Mwangi, Isaiah; Mwarumba, Salim; Kitsao, Barnes S; Lowe, Brett S; Morpeth, Susan C; Khandwalla, Iqbal; Blackwell, Jenefer M; Bramon, Elvira; Brown, Matthew A; Casas, Juan P; Corvin, Aiden; Duncanson, Audrey; Jankowski, Janusz; Markus, Hugh S; Mathew, Christopher G; Palmer, Colin N A; Plomin, Robert; Sawcer, Stephen J; Trembath, Richard C; Viswanathan, Ananth C; Wood, Nicholas W; Deloukas, Panos; Peltonen, Leena; Williams, Thomas N; Scott, J Anthony G; Chapman, Stephen J; Donnelly, Peter; Hill, Adrian V S; Spencer, Chris C A
Bacteremia (bacterial bloodstream infection) is a major cause of illness and death in sub-Saharan Africa but little is known about the role of human genetics in susceptibility. We conducted a genome-wide association study of bacteremia susceptibility in more than 5,000 Kenyan children as part of the Wellcome Trust Case Control Consortium 2 (WTCCC2). Both the blood-culture-proven bacteremia case subjects and healthy infants as controls were recruited from Kilifi, on the east coast of Kenya. Streptococcus pneumoniae is the most common cause of bacteremia in Kilifi and was thus the focus of this study. We identified an association between polymorphisms in a long intergenic non-coding RNA (lincRNA) gene (AC011288.2) and pneumococcal bacteremia and replicated the results in the same population (p combined = 1.69 × 10(-9); OR = 2.47, 95% CI = 1.84-3.31). The susceptibility allele is African specific, derived rather than ancestral, and occurs at low frequency (2.7% in control subjects and 6.4% in case subjects). Our further studies showed AC011288.2 expression only in neutrophils, a cell type that is known to play a major role in pneumococcal clearance. Identification of this novel association will further focus research on the role of lincRNAs in human infectious disease.
Julián-Jiménez, A; Gutiérrez-Martín, P; Lizcano-Lizcano, A; López-Guerrero, M A; Barroso-Manso, Á; Heredero-Gálvez, E
The aim of this study was to analyze and compare the capacity of procalcitonin (PCT), C-reactive protein (CRP), lactate and leukocytes to predict the presence of bacteremia in patients with urinary tract infections (UTIs). Observational, retro-prospective analytical study of adult patients (≥15 years) diagnosed with UTI in an emergency department from August 2012 to January 2013. The study included 328 patients diagnosed with UTI, with a mean age of 52±22 years, 74% of whom were women. Of these, 43 (13.1%) had bacteremia. For predicting bacteremia, PCT achieved the largest area under the receiver operating characteristic curve (ROC-AUC) at .993 (95% CI .987-1; P<.001). A cutoff≥1.16ng/mL achieves a sensitivity of 100%, a specificity of 97%, a positive predictive value of 84% and a negative predictive value of 100%. Lactate achieved an ROC-AUC of .844, and CRP achieved only .534. The mean values when comparing PCT levels in patients with UTIs with and without bacteremia were 8.08±16.37 and .34±.37ng/mL, respectively (P<.001). For patients with UTIs in the emergency department, PCT achieves considerable diagnostic performance for suspecting bacteremia, a performance greater than that of lactate, CRP and leukocytes. Copyright © 2015 AEU. Publicado por Elsevier España, S.L.U. All rights reserved.
Armbruster, Chelsie E; Smith, Sara N; Yep, Alejandra; Mobley, Harry L T
Catheter-associated urinary tract infections (CaUTIs) are the most common hospital-acquired infections worldwide and are frequently polymicrobial. The urease-positive species Proteus mirabilis and Providencia stuartii are two of the leading causes of CaUTIs and commonly co-colonize catheters. These species can also cause urolithiasis and bacteremia. However, the impact of coinfection on these complications has never been addressed experimentally. A mouse model of ascending UTI was utilized to determine the impact of coinfection on colonization, urolithiasis, and bacteremia. Mice were infected with P. mirabilis or a urease mutant, P. stuartii, or a combination of these organisms. In vitro experiments were conducted to assess growth dynamics and impact of co-culture on urease activity. Coinfection resulted in a bacterial load similar to monospecies infection but with increased incidence of urolithiasis and bacteremia. These complications were urease-dependent as they were not observed during coinfection with a P. mirabilis urease mutant. Furthermore, total urease activity was increased during co-culture. We conclude that P. mirabilis and P. stuartii coinfection promotes urolithiasis and bacteremia in a urease-dependent manner, at least in part through synergistic induction of urease activity. These data provide a possible explanation for the high incidence of bacteremia resulting from polymicrobial CaUTI.
Hess, Aaron S; Kleinberg, Michael; Sorkin, John D; Netzer, Giora; Johnson, Jennifer K; Shardell, Michelle; Thom, Kerri A; Harris, Anthony D; Roghmann, Mary-Claire
We hypothesized that prior colonization with antibiotic-resistant Gram-negative bacteria is associated with increased risk of subsequent antibiotic-resistant Gram-negative bacteremia among cancer patients. We performed a matched case-control study. Cases were cancer patients with a blood culture positive for antibiotic-resistant Gram-negative bacteria. Controls were cancer patients with a blood culture not positive for antibiotic-resistant Gram-negative bacteria. Prior colonization was defined as any antibiotic-resistant Gram-negative bacteria in surveillance or non-sterile-site cultures obtained 2-365 days before the bacteremia. Thirty-two (37%) of 86 cases and 27 (8%) of 323 matched controls were previously colonized by any antibiotic-resistant Gram-negative bacteria. Prior colonization was strongly associated with antibiotic-resistant Gram-negative bacteremia (odds ratio [OR] 7.2, 95% confidence interval [CI] 3.5-14.7) after controlling for recent treatment with piperacillin-tazobactam (OR 2.5, 95% CI 1.3-4.8). In these patients with suspected bacteremia, prior cultures may predict increased risk of antibiotic-resistant Gram-negative bacteremia. Copyright © 2014 Elsevier Inc. All rights reserved.
Day, Michael W; Jackson, Lydgia A; Akins, Darrin R; Dyer, David W; Chavez-Bueno, Susana
Neonatal bacteremia Escherichia coli strains commonly belong to the K1 capsular type. Their ability to cause invasive neonatal disease appears to be determined by other virulence factors that have yet to be identified. We report here the genome sequences of four E. coli neonatal bacteremia isolates, including that of the archetypal strain RS218.
Riu, Marta; Chiarello, Pietro; Terradas, Roser; Sala, Maria; Garcia-Alzorriz, Enric; Castells, Xavier; Grau, Santiago; Cots, Francesc
Abstract To estimate the incremental cost of nosocomial bacteremia according to the causative focus and classified by the antibiotic sensitivity of the microorganism. Patients admitted to Hospital del Mar in Barcelona from 2005 to 2012 were included. We analyzed the total hospital costs of patients with nosocomial bacteremia caused by microorganisms with a high prevalence and, often, with multidrug-resistance. A control group was defined by selecting patients without bacteremia in the same diagnosis-related group. Our hospital has a cost accounting system (full-costing) that uses activity-based criteria to estimate per-patient costs. A logistic regression was fitted to estimate the probability of developing bacteremia (propensity score) and was used for propensity-score matching adjustment. This propensity score was included in an econometric model to adjust the incremental cost of patients with bacteremia with differentiation of the causative focus and antibiotic sensitivity. The mean incremental cost was estimated at €15,526. The lowest incremental cost corresponded to bacteremia caused by multidrug-sensitive urinary infection (€6786) and the highest to primary or unknown sources of bacteremia caused by multidrug-resistant microorganisms (€29,186). This is one of the first analyses to include all episodes of bacteremia produced during hospital stays in a single study. The study included accurate information about the focus and antibiotic sensitivity of the causative organism and actual hospital costs. It provides information that could be useful to improve, establish, and prioritize prevention strategies for nosocomial infections. PMID:28445264
Huttunen, Reetta; Hurme, Mikko; Laine, Janne; Eklund, Carita; Vuento, Risto; Aittoniemi, Janne; Huhtala, Heini; Syrjänen, Jaana
Nitric oxide (NO) as a vasoactive substance is a crucial element in the pathogenesis of sepsis. Endothelial NO synthase (eNOS) is, in turn, a key regulator of vascular NO production. The eNOS gene polymorphism at position 894 (G>T, Glu298Asp) resulting in T allele has been studied in the context of vascular diseases, but its role in sepsis has not yet been explored. We here studied the effect of eNOS Glu298Asp polymorphism on the clinical course of the disease in patients with bacteremia. The study comprised 147 patients with bacteremia caused by Staphylococcus aureus, Streptococcus pneumoniae, beta-hemolytic streptococci, or Escherichia coli. Laboratory findings and clinical data were registered on admission and during 6 consecutive days. The polymorphism of eNOS gene, G894T, was genotyped. Carriage of the T allele was associated with low MAP (P = 0.004) and high Sequential Organ Failure Assessment score (P = 0.001) in patients with E. coli bacteremia. The effect on blood pressure was most prominent in the early stage of the disease (MAP on admission = 52 mmHg in T-allele carriers vs. 91 mmHg in noncarriers; P < 0.001). However, the same was not detected in bacteremia caused by a gram-positive organism (S. aureus, S. pneumoniae, or beta-hemolytic streptococci). The Glu298Asp polymorphism had no effect on case fatality in any pathogen. Carriage of the T allele of the eNOS gene is a risk factor for hypotension in patients with E. coli bacteremia but not in bacteremia caused by a gram-positive organism.
Background Information is sparse regarding the association between international travel and hospitalization with non-typhoidal Salmonella bacteremia. The aim of this study was to determine the proportion, risk factors and outcomes of travel-related non-typhoidal Salmonella bacteremia. Methods We conducted a 10-year population-based cohort study of all patients hospitalized with non-typhoidal Salmonella bacteremia in three Danish counties (population 1.6 million). We used denominator data on Danish travellers to assess the risk per 100,000 travellers according to age and travel destination. We used patients contemporaneously diagnosed with travel-related Salmonella gastroenteritis as reference patients to estimate the relative risk of presenting with travel-related bacteremia as compared with gastroenteritis. To evaluate clinical outcomes, we compared patients with travel-related bacteremia and patients with domestically acquired bacteremia in terms of length of hospital stay, number of extraintestinal focal infections and mortality after 30 and 90 days. Results We identified 311 patients hospitalized with non-typhoidal Salmonella bacteremia of whom 76 (24.4%) had a history of international travel. The risk of travel-related bacteremia per traveller was highest in the age groups 15-24 years (0.8/100,000 travellers) and 65 years and above (1.2/100,000 travellers). The sex- and age-adjusted relative risk of presenting with bacteremia was associated with travel to Sub-Saharan Africa (odds ratio 18.4; 95% confidence interval [6.9-49.5]), the Middle East (10.6; [2.1-53.2]) and South East Asia (4.0; [2.2-7.5]). We found high-risk countries in the same three regions when estimating the risk per traveller according to travel destination. Patients hospitalized with travel-related bacteremia had better clinical outcomes than patients with domestically acquired bacteremia, they had a shorter length of hospital stay (8 vs. 11 days), less extraintestinal focal infections (5 vs
Asturias, E.J.; Corral, J.E.; Quezada, J.
Febrile neutropenia is a well-known entity in children with cancer, being responsible for the high risk for infection that characterizes this population. For this reason, cancer patients are hospitalized so that they can receive prophylactic care. Risk factors have been used to classify patients at a high risk for developing bacteremia. The present study evaluates whether those risk factors (C-reactive protein, hypotension, leukemia as the cancer type, thrombocytopenia, recent chemotherapy, and acute malnutrition) apply to patients at the Unidad Nacional de Oncología Pediátrica. We evaluated 102 episodes in 88 patients, in whom risk factors and blood cultures were tested. We observed no statistical relationship between the six risk factors and bacteremia. There was also no relationship between bacteremia and the simultaneous presence of two, three, or more risk factors. A significant relationship of C-reactive protein and platelet count with other outcome factors was observed. PMID:20404980
Wang, Kung-Ching; Liu, Meei-Fang; Lin, Chin-Fu; Shi, Zhi-Yuan
The susceptibility breakpoints of cephalosporins for Enterobacteriaceae were revised by the Clinical and Laboratory Standards Institute (CLSI) in 2010 and 2011. The clinical outcome and susceptibility data were analyzed to evaluate the impact of revised CLSI cefazolin breakpoints on the treatment of Escherichia coli bacteremia. Forty-three bacteremic Escherichia coli isolates from Taichung Veterans General Hospital, Taichung, Taiwan, during the period from January 2013 to December 2013, were selected to analyze the minimum inhibitory concentration (MIC) distributions of cefazolin and the correlated clinical responses to cefazolin therapy. The modal cefazolin MIC among the 43 isolates was 1 μg/mL and accounted for 18 (42%) isolates. The cumulative percentage for MICs ≤ 2 μg/mL was 79%. The conventional dosing regimens achieved clinical cure in 33 (97%) of 34 patients with bacteremia due to E. coli with a cefazolin MIC ≤ 2 μg/mL, in all of the six patients with a cefazolin MIC of 4 μg/mL, and all of the three patients with a cefazolin MIC of 8 μg/mL. The microbiological data support the revised CLSI breakpoints of cefazolin. The conventional cefazolin dosing regimens can still achieve satisfactory clinical cure rates for bacteremia of E. coli with a cefazolin MIC ≤ 2 μg/mL in patients without severe septic shock. Before the approval of the efficacy of cefazolin for the treatment of E. coli isolates with a cefazolin MIC of 4 μg/mL, it is prudent to use cefazolin only when a high drug level can be achieved in the infection site, such as the urinary tract. Copyright © 2015. Published by Elsevier B.V.
Boel, J; Søgaard, M; Andreasen, V; Jarløv, J O; Arpi, M
When introducing new antibiotic guidelines for empirical treatment of bacteremia, it is imperative to evaluate the performance of the new guideline. We examined the utility of administrative data to evaluate the effect of new antibiotic guidelines and the prognostic impact of appropriate empirical treatment. We categorized 2,008 adult patients diagnosed with bacteremia between 2010 and 2012 according to whether they received cephalosporins or fluoroquinolones (old regimen) or not (new regimen). We used administrative data to extract individual level data on mortality, readmission, and appropriateness of treatment, and computed adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) for 30-day mortality and post-discharge readmission by regimen and appropriateness of treatment. In total, 945 (47.1%) were treated by the old regimen and 1,063 (52.9%) by the new. The median length of stay (8 days) did not differ by regimen and neither did the proportion of those receiving appropriate empirical treatment (84.1% vs. 85.5%). However, fewer patients with the new regimen were admitted to the intensive care unit (ICU; 3.8% vs. 12.0%) and they had lower 30-day mortality (16.4% vs. 23.4%). The adjusted 30-day mortality HR for appropriate versus inappropriate treatment was 0.79 (95% CI 0.62-1.01) and 0.83 (95% CI 0.66-1.05) for the new versus the old regimen. The HR for 30-day readmission for appropriate versus inappropriate treatment was 0.91 (95% CI 0.73-1.13) and 1.05 (95% CI 0.87-1.25) for the new versus the old regimen. This study demonstrates that administrative data can be useful for evaluating the effect and quality of new bacteremia treatment guidelines.
Takeshima, Taro; Yamamoto, Yosuke; Noguchi, Yoshinori; Maki, Nobuyuki; Gibo, Koichiro; Tsugihashi, Yukio; Doi, Asako; Fukuma, Shingo; Yamazaki, Shin; Kajii, Eiji; Fukuhara, Shunichi
Objectives (1) To develop a clinical prediction rule to identify patients with bacteremia, using only information that is readily available in the emergency room (ER) of community hospitals, and (2) to test the validity of that rule with a separate, independent set of data. Design Multicenter retrospective cohort study. Setting To derive the clinical prediction rule we used data from 3 community hospitals in Japan (derivation). We tested the rule using data from one other community hospital (validation), which was not among the three “derivation” hospitals. Participants Adults (age ≥ 16 years old) who had undergone blood-culture testing while in the ER between April 2011 and March 2012. For the derivation data, n = 1515 (randomly sampled from 7026 patients), and for the validation data n = 467 (from 823 patients). Analysis We analyzed 28 candidate predictors of bacteremia, including demographic data, signs and symptoms, comorbid conditions, and basic laboratory data. Chi-square tests and multiple logistic regression were used to derive an integer risk score (the “ID-BactER” score). Sensitivity, specificity, likelihood ratios, and the area under the receiver operating characteristic curve (i.e., the AUC) were computed. Results There were 241 cases of bacteremia in the derivation data. Eleven candidate predictors were used in the ID-BactER score: age, chills, vomiting, mental status, temperature, systolic blood pressure, abdominal sign, white blood-cell count, platelets, blood urea nitrogen, and C-reactive protein. The AUCs was 0.80 (derivation) and 0.74 (validation). For ID-BactER scores ≥ 2, the sensitivities for derivation and validation data were 98% and 97%, and specificities were 20% and 14%, respectively. Conclusions The ID-BactER score can be computed from information that is readily available in the ERs of community hospitals. Future studies should focus on developing a score with a higher specificity while maintaining the desired sensitivity
Kellie, Susan M; Timmins, Anne; Brown, Carlene
Infection control guidelines recommend multiple concurrent interventions to reduce methicillin-resistant Staphylococcus aureus (MRSA) infections. A quasi-experimental study was conducted to investigate the effect of an infection control collaborative conducted from July 1, 2008, through June 30, 2009, to decrease the rate of hospital-onset bacteremias by 40%. An MRSA curriculum was developed and delivered during three learning sessions. Guidelines, key literature, policies, and educational tools were disseminated. Teams were surveyed at the end of the collaborative and again 18 months later. Teams were recruited from 12 acute care hospitals and 1 long-term acute care hospital, with capacities ranging from 22 to 623 licensed beds. Hospital intervention teams reported 44 hospital-onset, 18 health care-associated, and 122 community-onset MRSA bacteremias in the baseline year, yielding a hospital-onset rate of 0.79 per 10,000 patient-days. By the second six months of the intervention, this rate fell to 0.41, representing an aggregate 48% decline--but a nonsignificant result. Rates of health care-associated and community-onset bacteremias were unchanged. At baseline, 4 hospitals routinely performed active surveillance testing (AST) on 241 beds, which increased to 7 hospitals and 369 beds by July 2009. A follow-up survey completed by 11 hospitals indicated that barriers were similar for large and small facilities. A final survey performed 18 months postcollaborative indicated that 2 additional hospitals had initiated AST, 5 had expanded the use of AST, and only 1 had discontinued AST. A collaborative model was successfully used to engage a diverse group of hospitals in a rural state to produce measurable improvement and sustained changes in processes of care.
Namekata, David Y; Kasten, Rickie W; Boman, Dawn A; Straub, Mary H; Siperstein-Cook, Laurie; Couvelaire, Karen; Chomel, Bruno B
Cats are the main reservoirs of zoonotic Bartonella henselae, B. clarridgeiae and B. koehlerae, transmitted among cats by cat fleas. No study has investigated the presence of Bartonella in the saliva of bacteremic and non-bacteremic cats to correlate it to the level of bacteremia and the presence or absence of oral lesions. Shelter cats from northern California (n=130) and Michigan (n=50) were tested for Bartonella bacteremia by blood culture, presence of Bartonella antibodies and Bartonella DNA in oral swabs. Bacteremia was detected in 45 (25%) cats, mainly from northern California (n=40), which were highly flea infested and were 4 times more likely to be bacteremic than the non-flea-infested cats from Michigan. Overall, 69 (38.3%) cats had Bartonella PCR positive oral swabs. Bacteremic cats were almost 3 times (P=0.003) more likely to have PCR positive oral swabs (59%, 26/44) than non-bacteremic cats (32.5%, 44/135). However, there was no correlation between cats being bacteremic and having oral lesions. Antibody prevalences for B. henselae and B. clarridgeiae were 30% and 42.8%. B. henselae and B. clarridgeiae seropositive cats were almost 4 times (P=0.0001) and 3 times (P=0.003) more likely to have oral lesions than seronegative cats. Despite a higher prevalence (odds ratio=1.73; 95% confidence interval=0.88-3.38) of oral lesions in cats with oral swabs testing PCR positive, no statistical association could be demonstrated in this cat population.
Takeshima, Taro; Yamamoto, Yosuke; Noguchi, Yoshinori; Maki, Nobuyuki; Gibo, Koichiro; Tsugihashi, Yukio; Doi, Asako; Fukuma, Shingo; Yamazaki, Shin; Kajii, Eiji; Fukuhara, Shunichi
(1) To develop a clinical prediction rule to identify patients with bacteremia, using only information that is readily available in the emergency room (ER) of community hospitals, and (2) to test the validity of that rule with a separate, independent set of data. Multicenter retrospective cohort study. To derive the clinical prediction rule we used data from 3 community hospitals in Japan (derivation). We tested the rule using data from one other community hospital (validation), which was not among the three "derivation" hospitals. Adults (age ≥ 16 years old) who had undergone blood-culture testing while in the ER between April 2011 and March 2012. For the derivation data, n = 1515 (randomly sampled from 7026 patients), and for the validation data n = 467 (from 823 patients). We analyzed 28 candidate predictors of bacteremia, including demographic data, signs and symptoms, comorbid conditions, and basic laboratory data. Chi-square tests and multiple logistic regression were used to derive an integer risk score (the "ID-BactER" score). Sensitivity, specificity, likelihood ratios, and the area under the receiver operating characteristic curve (i.e., the AUC) were computed. There were 241 cases of bacteremia in the derivation data. Eleven candidate predictors were used in the ID-BactER score: age, chills, vomiting, mental status, temperature, systolic blood pressure, abdominal sign, white blood-cell count, platelets, blood urea nitrogen, and C-reactive protein. The AUCs was 0.80 (derivation) and 0.74 (validation). For ID-BactER scores ≥ 2, the sensitivities for derivation and validation data were 98% and 97%, and specificities were 20% and 14%, respectively. The ID-BactER score can be computed from information that is readily available in the ERs of community hospitals. Future studies should focus on developing a score with a higher specificity while maintaining the desired sensitivity.
Jacob-Kokura, Susan; Chan, Claire Y; Kaplan, Lewis
To describe the first reported case of bacteremia and empyema caused by Shewanella algae and summarize the existing literature on Shewanella human infection. A 25-year-old healthy male was shot through the chest into the abdomen and fled into an adjacent body of seawater. He underwent surgical repair of his injuries, including pleural decortication. Leukocytosis, bandemia, and copious yellow bronchorrhea led to cultures; piperacillin/tazobactam and vancomycin were started for broad-spectrum empiric management based on the local intensive care unit antibiogram. Blood and pleural fluid cultures revealed S algae. Sputum cultures grew methicillin-sensitive Staphylococcus aureus and Haemophilus influenzae. He was successfully managed with an empiric and then tailored antibiotic regimen. Shewanella algae is a rare Gram-negative bacillus that has infrequently been reported to cause infection. It is found predominantly in men. Shewanella algae infections span bacteremia to necrotizing soft tissue infection and are associated with injury and seawater exposure. Shewanella is susceptible to the majority of third- and fourth-generation cephalosporins, aminoglycosides, chloramphenicol, erythromycin, aztreonam, and fluoroquinolones, but are less predictably susceptible to tetracycline and trimethoprim/sulfamethoxazole and carbapenem agents. Shewanella infection is associated with medical comorbidities, in particular, renal failure and cardiovascular disease. To our knowledge, this is the first case report of bacteremia and empyema caused by S algae. Such a case involving a young healthy individual should encourage health care providers to be aware of the potential infections caused by unusual pathogens, and to employ appropriate empiric antibiotic therapy based on reported sensitivity profiles. Based on available susceptibilities, we recommend using a third or fourth-generation cephalosporin as first-line pharmacologic management with regimen de-escalation based on culture
Lee, Ji-Yong; Kang, Cheol-In; Ko, Jae-Hoon; Lee, Woo Joo; Seok, Hye-Ri; Park, Ga Eun; Cho, Sun Young; Ha, Young Eun; Chung, Doo Ryeon; Lee, Nam Yong; Peck, Kyong Ran; Song, Jae-Hoon
With the increasing use of carbapenems, carbapenem-resistant Gram-negative bacteria have become a major concern in health care-associated infections. The present study was performed to evaluate the clinical and microbiological features of breakthrough Gram-negative bacteremia (GNB) during carbapenem therapy and to assess risk factors for development of breakthrough GNB. A case-control study was performed at a tertiary hospital from 2005 to 2014. Case patients were defined as individuals whose blood cultures grew Gram-negative bacteria while the patients were receiving carbapenems for at least 48 h before breakthrough GNB. Age-, sex-, and date-matched controls were selected from patients who received carbapenem for at least 48 h and did not develop breakthrough GNB during carbapenem treatment. A total of 101 cases of breakthrough GNB were identified and compared to 100 controls. The causative microorganisms for breakthrough GNB were Stenotrophomonas maltophilia (n = 33), Acinetobacter baumannii (n = 32), Pseudomonas aeruginosa (n = 21), and others (n = 15). Approximately 90% of S. maltophilia isolates were susceptible to levofloxacin and trimethoprim-sulfamethoxazole. The most common infection types were primary bacteremia (38.6%) and respiratory infections (35.6%). More than half of the patients died within a week after bacteremia, and the 30-day mortality rate was 70.3%. In a multivariate analysis, a longer hospital stay, hematologic malignancy, persistent neutropenia, immunosuppressant use, and previous colonization by causative microorganisms were significantly associated with breakthrough GNB. Our data suggest that S. maltophilia, A. baumannii, and P. aeruginosa are the major pathogens of breakthrough GNB during carbapenem therapy, in association with a longer hospital stay, hematologic malignancy, persistent neutropenia, immunosuppressant use, and previous colonization. Copyright © 2016, American Society for Microbiology. All Rights Reserved.
Marchaim, D; Zaidenstein, R; Lazarovitch, T; Karpuch, Y; Ziv, T; Weinberger, M
Increased resistance among isolates causing bacteremia constitutes a major challenge to medical practitioners and institutions. Variability between institutes is substantial, and requires the individual analysis of local trends. An eight-year (1997-2004) surveillance study of episodes of bacteremia was conducted in an 850-bed university hospital in central Israel. Trends of incidence, resistance, age, and mortality were analyzed. We studied 6,096 patient-unique episodes of bacteremia, of which, 2,722 (45.3%) were nosocomial and 523 (9.2%) involved children less than 18 years of age. The overall incidence of bacteremia episodes has increased over the study years by 39% and the patient mean age by 7.5 years. Gram-negative organisms accounted for 72% of hospital-acquired cases and 69% of community-acquired cases. There was a substantial increase in the incidence of nosocomial episodes, predominantly due to Gram-negative isolates, mainly Acinetobacter baumannii, Klebsiella pneumoniae, and Escherichia coli. Increased resistance to broad-spectrum antibiotics was noted among Gram-negative organisms, including quinolones (in K. pneumoniae), imipenem (A. baumannii and P. aeruginosa), piperacillin-tazobactam (K. pneumoniae), and amikacin (A. baumannii and P. aeruginosa). Increased resistance to oxacillin among coagulase-negative staphylococci was also noted. The all-cause mortality rates showed a significant rise. The patient age, intensive care unit (ICU) stay, and hospital acquisition were independently associated with mortality. We describe an increase in the incidence and resistance of Gram-negative organisms causing bacteremia and concomitant ageing of the patients with bacteremia. Similar patterns have been reported from other localities, and are of real concern.
Papadimitriou-Olivgeri, I; Giormezis, N; Papadimitriou-Olivgeris, M; Zotou, A; Kolonitsiou, F; Koutsileou, K; Fligou, F; Marangos, M; Anastassiou, E D; Spiliopoulou, I
The significance of the number of coagulase-negative staphylococci (CNS)-positive blood cultures remains obscure in regards to determining true bacteremia versus contamination. The goal of this study was to determine the predictors of real CNS bloodstream infection among intensive care unit (ICU) patients. ICU patients with at least one CNS-positive blood culture were identified from the microbiology database. Biofilm formation was tested by glass tube and microtiter plate assay. mecA gene, ica operon genes (icaA, icaB, icaD), and adhesin genes (aap, bap, atlE, fbe, fnbA) were detected by polymerase chain reaction (PCR). CNS were recovered from 120 septic episodes, 20 of which were true CNS bacteremias, whereas from the remaining 100 episodes, the isolated CNS were characterized as contaminants. The number of positive blood cultures was significantly associated with true CNS bacteremia. Nineteen true bacteremic Staphylococcus epidermidis strains were compared to 38 contaminants. Biofilm synthesis was documented in 37 isolates associated with the presence of the ica operon (p = 0.048). There were 39, 26, 38, 21, and 10 strains positive for the presence of atlE, bap, fbe, aap, and fnbA genes, respectively. Rifampicin resistance, absence of severe sepsis, number of S. epidermidis-positive blood cultures, and absence of the bap gene were independently associated with true S. epidermidis bacteremia as compared to contaminant strains. The number of positive blood cultures is associated with true CNS bacteremia. The presence of adhesin genes may play a role in differentiating true infection from contamination, whereas absence of the bap gene is associated with true S. epidermidis bacteremia.
Kohler, Philipp P; Volling, Cheryl; Green, Karen; Uleryk, Elizabeth M; Shah, Prakesh S; McGeer, Allison
BACKGROUND Mortality associated with infections caused by carbapenem-resistant Enterobacteriaceae (CRE) is higher than mortality due to carbapenem-sensitive pathogens. OBJECTIVE To examine the association between mortality from bacteremia caused by carbapenem-resistant (CRKP) and carbapenem-sensitive Klebsiella pneumoniae (CSKP) and to assess the impact of appropriate initial antibiotic therapy (IAT) on mortality. DESIGN Systematic review and meta-analysis METHODS We searched MEDLINE, EMBASE, CINAHL, and Wiley Cochrane databases through August 31, 2016, for observational studies reporting mortality among adult patients with CRKP and CSKP bacteremia. Search terms were related to Klebsiella, carbapenem-resistance, and infection. Studies including fewer than 10 patients per group were excluded. A random-effects model and meta-regression were used to assess the relationship between carbapenem-resistance, appropriateness of IAT, and mortality. RESULTS Mortality was higher in patients who had CRKP bacteremia than in patients with CSKP bacteremia (15 studies; 1,019 CRKP and 1,148 CSKP patients; unadjusted odds ratio [OR], 2.2; 95% confidence interval [CI], 1.8-2.6; I2=0). Mortality was lower in patients with appropriate IAT than in those without appropriate IAT (7 studies; 658 patients; unadjusted OR, 0.5; 95% CI, 0.3-0.8; I2=36%). CRKP patients (11 studies; 1,326 patients; 8-year period) were consistently less likely to receive appropriate IAT (unadjusted OR, 0.5; 95% CI, 0.3-0.7; I2=43%). Our meta-regression analysis identified a significant association between the difference in appropriate IAT and mortality (OR per 10% difference in IAT, 1.3; 95% CI, 1.0-1.6). CONCLUSIONS Appropriateness of IAT is an important contributor to the observed difference in mortality between patients with CRKP bacteremia and patients with CSKP bacteremia. Infect Control Hosp Epidemiol 2017;1-10.
Blumenthal, Kimberly G; Shenoy, Erica S; Huang, Mingshu; Kuhlen, James L; Ware, Winston A; Parker, Robert A; Walensky, Rochelle P
Methicillin-sensitive Staphylococcus aureus (MSSA) bacteremia is a morbid infection with mortality benefit from receipt of parenteral β-lactam therapy. A substantial portion of MSSA bacteremia patients report penicillin allergy, but infrequently have true allergy. To determine the frequency and predictors of optimal and adequate therapy in patients with MSSA bacteremia. Retrospective cohort. Adult inpatients with MSSA bacteremia, January 2009 through October 2013. The primary measure was a trial of optimal therapy (OT), defined as ≥3 inpatient days or discharge on any first-line agents (nafcillin, oxacillin, cefazolin, or penicillin G, if susceptible). The secondary measure was completion of adequate therapy (AT), defined as ≥10 inpatient days or discharge on an agent appropriate for MSSA bacteremia. Data were electronically gathered with key variables manually validated through chart review. Log-binomial regression models were used to determine the frequency and predictors of outcomes. Of 456 patients, 346 (76%) received a trial of OT. Patients reporting penicillin allergy (13%) were less likely to receive OT trial than those without penicillin allergy (47% vs. 80%, p <0.001). Adjusting for other factors, penicillin allergy was the largest negative predictor of OT trial (RR 0.64 [0.49, 0.83]). Infectious Disease (ID) consultation was the largest positive predictor of OT trial across all patients (RR 1.34 [1.14, 1.57]). Allergy/Immunology consultation was the single most important predictor of OT trial among patients reporting penicillin allergy (RR 2.33 [1.44, 3.77]). Of 440 patients, 391 (89%) completed AT, with ID consultation the largest positive predictor of the outcome (RR 1.28 [1.15, 1.43]). Nearly 25% of patients with MSSA bacteremia did not receive OT trial and about 10% did not receive AT completion. Reported penicillin allergy reduced, and ID consult increased, the likelihood of OT. Allergy evaluation, coupled with ID consultation, may improve
Reis, Luciana C; Rôças, Isabela N; Siqueira, José F; de Uzeda, Milton; Lacerda, Vane S; Domingues, Regina M C P; Moraes, Saulo R; Saraiva, Roberto M
Infective endocarditis (IE) is still associated with high mortality, and antibiotic prophylaxis strategies are under intense debate. We evaluated the incidence of bacteremia after root canal preparation in teeth with necrotic pulps and apical periodontitis. Blood samples were taken before and 5 and 30 minutes after endodontic treatment in teeth with apical periodontitis from individuals at high (n = 21) or no risk (n = 11) for IE. The former received prophylactic antibiotic therapy. Bacteriologic samples were taken from root canals before chemomechanical preparation to confirm pulp infection. Samples were subjected to aerobic and anaerobic culture and quantitative real-time polymerase chain reaction (qPCR), the latter to determine the total bacterial and streptococcal levels. Culture revealed no bacteremia in all individuals. Analysis by qPCR showed that bacterial DNA occurred in all root canal samples. qPCR showed a similar incidence of bacteremia between patients who received or did not receive prophylactic antibiotic therapy (P > .05). In blood samples taken 5 minutes after endodontic procedures, bacteria were detected in 2 of 11 (18%) individuals not taking antibiotics and in 4 of 21 (19%) patients under prophylaxis. After 30 minutes, the incidence of bacteremia decreased to 2 of 21 (10%) in patients taking antibiotics and was undetectable in patients at no risk of IE. The incidence of bacteremia by streptococci was identical as that for total bacteria. No detectable bacteremia was evident by culture after treatment of infected root canals. Molecular analysis revealed bacterial DNA and streptococci in blood from some patients without a significant difference between individuals receiving or not receiving antibiotic prophylaxis. Copyright © 2016 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.
Ezpeleta Baquedano, C; Uriarte Asteinza, E; Sota Busselo, M; García Jiménez, N; De Miguel de la Villa, F; Cisterna Cáncer, R
Corynebacterium striatum is a Gram-positive pleomorphic bacillus that has been regarded as a saprophyte of mucous membranes and skin. There are certain difficulties in identifying the Corynebacteria species in the laboratory and it is often necessary to resort to techniques which are not available in all laboratories. Over recent years, C. striatum has shown itself to be a potential pathogen generally in weakened or immunodepressed individuals, in relation with intravenous catheters and in intensive care units. We report a case of bacteremia by C. striatum and neutrocytic ascites probably related to that microorganism, and, in view of the rarity of this isolement, we have reviewed the cases published on this subject.
Goel, Noopur; Munshi, Lubna Bashir; Thyagarajan, Braghadheeswar
Patients with history of intravenous drug abuse are noted to be at risk of several infections including HIV, endocarditis, and other opportunistic infections. We report the case of a patient with sustained Bacillus cereus bacteremia despite use of multiple antibiotic regimens during his inpatient stay. Our case highlights the importance of high suspicion for active drug use inside the hospital in such patients. This is important in order to minimize unnecessary diagnostic workup and provide adequate treatment and safe hospital stay for these patients.
Benusic, Michael A; Press, Natasha M; Hoang, Linda Mn; Romney, Marc G
Bacillus cereus is a ubiquitous spore-forming organism that is infrequently implicated in extraintestinal infections. The authors report three cases of B cereus bacteremia among injection drug users presenting within one month to an urban tertiary care hospital. Treatment with intravenous vancomycin was successful in all three cases. While temporal association suggested an outbreak, molecular studies of patient isolates using pulsed-field gel electrophoresis did not suggest a common source. A review of the association of B cereus infections with heroin use and treatment of this pathogen is provided.
Patients with history of intravenous drug abuse are noted to be at risk of several infections including HIV, endocarditis, and other opportunistic infections. We report the case of a patient with sustained Bacillus cereus bacteremia despite use of multiple antibiotic regimens during his inpatient stay. Our case highlights the importance of high suspicion for active drug use inside the hospital in such patients. This is important in order to minimize unnecessary diagnostic workup and provide adequate treatment and safe hospital stay for these patients. PMID:27433362
Tartof, Sara Y; Gounder, Prabhu; Weiss, Don; Lee, Lillian; Cassiday, Pamela K; Clark, Thomas A; Briere, Elizabeth C
We describe the first report of temporally related cases of Bordetella holmesii bacteremia. Demographic and clinical data were collected through chart abstraction and case-patient interviews. Twenty-two cases were identified from 6 states. Symptom onset dates ranged from April 2010 to January 2011. Median age of patients was 17.1 years and 64% had functional or anatomic asplenia. Pulsed-field gel electrophoresis profiles of a sample of isolates were identical. These cases occurred during a peak in pertussis outbreaks with documented cases of B. holmesii/Bordetella pertussis respiratory coinfection; whether there is a link between B. holmesii respiratory and bloodstream infection is unknown.
Yamagami, Keiko; Miyashita, Tomoko; Nakamura, Tomoyuki; Shirano, Michinori; Nakamura, Tadahiro; Kameda, Kazuaki; Nishijima, Masayoshi; Imanishi, Masahiro; Yang, Xi; Kanegane, Hirokazu
A 24-year-old man presented with fever and pleural effusion predominantly containing lymphocytes. Cultures of the pleural effusion and blood revealed Campylobacter fetus, and laboratory studies showed a low serum level of immunoglobulin. The patient was diagnosed with C. fetus pleuritis, bacteremia and primary hypogammaglobulinemia, and subsequent treatment with meropenem and immunoglobulin improved his condition. Although the underlying cause of the primary hypogammaglobulinemia remains unclear, the patient's status improved under immunoglobulin replacement therapy. C. fetus pleuritis is a rare infectious disease usually observed in immunocompromised hosts. We herein describe the first report of C. fetus pleuritis in a young adult with primary hypogammaglobulinemia.
Kitten, Todd; Munro, Cindy L; Zollar, Nicai Q; Lee, Sehmi P; Patel, Resham D
Oral streptococci have been associated with systemic diseases, including infective endocarditis and neutropenic bacteremia. We analyzed 58 recent oral streptococcal bloodstream isolates, and we obtained clinical and demographic data for source patients. The sodA gene was found to be a better target than the 16S-23S rRNA internal transcribed spacer for DNA sequence-based species identification. Together, Streptococcus mitis and Streptococcus oralis were significantly more likely than the 12 combined remaining species to be isolated from neutropenic patients.
During the period of 1971 to 1979, 172 Proteus mirabilis and 17 Proteus vulgaris strains were collected from blood cultures. Of these strains, 144 could be grouped into 25 O antigens. The most common antigens were O3, O23, O10, O30, and O24, which represented 46.1% of all strains. The O antigen distribution of strains isolated from blood cultures did not differ significantly from that of fecal and urinary strains. No particular O antigen could thus be defined as a virulence factor in bacteremia.
Badiaga, Sékéné; Brouqui, Philippe; Raoult, Didier
Trench fever, a louse-borne disease caused by Bartonella quintana, is reemerging in homeless persons. Epidemic typhus is another life-threatening louse-borne disease caused by Rickettsia prowazekii and known to occur in conditions of war, famine, refugee camps, cold weather, poverty, or lapses in public health. We report the first case of seroconversion to R. prowazekii in a homeless person of Marseilles, France. This was associated with B. quintana bacteremia. Although no outbreaks of typhus have been notified yet in the homeless population, this disease is likely to reemerge in such situation.
Ladutko, Lynn; Brown-Elliott, Barbara A.; Vasireddy, Ravikiran; Vasireddy, Sruthi; Wallace, Richard J.; Jakubiec, Wesley; Brecher, Stephen; Campbell, Sheldon
Mycobacterium canariasense is a recently described late-pigmenting, rapidly growing mycobacterium linked to bacteremia in patients with underlying malignant diseases. We report a case of M. canariasense infection in a patient from Massachusetts with underlying diffuse B cell lymphoma, which was identified both by multilocus sequence typing and matrix-assisted laser desorption ionization–time of flight mass spectrometry (MALDI-TOF MS). To our knowledge, this is the first description after its original identification in Spain and the first report of this opportunistic pathogen in the Americas. PMID:24740075
Patzkowski, Jeanne C; Hurst, Frank P; Neff, Robert T; Abbott, Kevin C
Proper management of infected tunneled-cuffed catheters (TCC) is essential in order to avoid catastrophic consequences for the patient. Hematogenous dissemination of infection can result in serious secondary infections, including infective endocarditis, osteomyelitis, and epidural abscess. Pelvic osteomyelitis is an extremely rare condition in adults with no reported cases of infection localized to more than one pelvic bone at a time. We present a case of a hemodialysis patient who developed osteomyelitis of the entire right hemipelvis due to MRSA bacteremia after repeated attempts at TCC salvage. PMID:21694913
Carvalho, Vania M; Osugui, Lika; Setzer, Ariela P; Lopez, Rodrigo P G; Pestana de Castro, Antonio F; Irino, Kinue; Catão-Dias, José L
Diseases caused by extraintestinal pathogenic Escherichia coli (ExPEC) in wild felids are rarely reported. Although urinary tract infections are infrequently reported in domestic cats, such infections when present are commonly caused by ExPEC. The present work characterized ExPEC strains isolated from 2 adult felines, a snow leopard (Panthera uncia) and a black leopard (Panthera pardus melas), that died from secondary bacteremia associated with urinary tract infections. Isolates from both animals were classified into the B2 phylogenetic group and expressed virulence genotypes that allowed them to cause severe disease. In addition, strains from the black leopard showed multidrug resistance.
Tartof, Sara Y.; Gounder, Prabhu; Weiss, Don; Lee, Lillian; Cassiday, Pamela K.; Clark, Thomas A.; Briere, Elizabeth C.
We describe the first report of temporally related cases of Bordetella holmesii bacteremia. Demographic and clinical data were collected through chart abstraction and case-patient interviews. Twenty-two cases were identified from 6 states. Symptom onset dates ranged from April 2010 to January 2011. Median age of patients was 17.1 years and 64% had functional or anatomic asplenia. Pulsed-field gel electrophoresis profiles of a sample of isolates were identical. These cases occurred during a peak in pertussis outbreaks with documented cases of B. holmesii/Bordetella pertussis respiratory coinfection; whether there is a link between B. holmesii respiratory and bloodstream infection is unknown. PMID:24092805
Asimaki, E; Nolte, O; Overesch, G; Strahm, C
Erysipelothrix rhusiopathiae is a facultative anaerobic Gram-positive rod that occurs widely in nature and is best known in veterinary medicine for causing swine erysipelas. In humans, infections are rare and mainly considered as occupationally acquired zoonosis. A case of E. rhusiopathiae bacteremia most likely associated with home freshwater aquarium handling is reported. The route of transmission was probably a cut with the dorsal fin of a dead pet fish. A short review of clinical presentations, therapeutic considerations and pitfalls of E. rhusiopathiae infections in humans is presented.
Julián-Jiménez, Agustín; Timón Zapata, Jesús; Laserna Mendieta, Emilio José; Parejo Miguez, Raquel; Flores Chacartegui, Manuel; Gallardo Schall, Pablo
To analyze the usefulness and ability of procalcitonin (PCT) to predict the presence of bacteremia in patients with community-acquired pneumonia (CAP) caused by Streptococcus pneumoniae (S. pneumoniae) or other bacteria. This is an observational, prospective and descriptive study involving patients who were diagnosed with CAP in our Emergency Department. Data collected included socio-demographic and comorbidity variables, Charlson index, stage in the Pneumonia Severity Index and criteria of severe NAC, microbiologic studies and biomarker determinations (PCT and C reactive protein). The follow-up was carried out during 30 days to calculate the predictive power and the diagnostic performance for bacteremia caused or not by S. pneumoniae. Four hundred and seventy-four patients were finally included in the study. Blood cultures were positive in 85 individuals (17.9%) and S. pneumoniae was identified as the responsible pathogen in 75 of them (88.4%) (in 5 cases together with another agent). The area under the Receiver Operating Characteristic curve for PCT to predict bacteremia (caused by S. pneumoniae or not) was 0.988 (95% confidence interval 0.908-0.995; P<.001) and, considering a cut-off value≥0.95ng/mL, the negative predictive value and the positive likelihood ratio were>98% and>10, respectively. The most frequently isolated serotypes of S. pneumoniae were 19A, 7F, 1 and 3. The highest mean levels of PCT were found in serotypes 7F, 19A, 3 and 1, which showed statistically significant differences with regard to the others serotypes considered (P=.008). Serotypes associated with the highest percentage of severe sepsis-septic shock, 30-days mortality and multi-lobe or bilateral affection were 3, 1 and 19A; 1, 3 and 19A; and 3, 19A and 6A, respectively. PCT had a remarkable diagnostic ability to discard or suspect bacteremia and to guide the etiology of CAP caused by S. pneumoniae. Serotypes 1, 3, 19A and 7F showed greater frequency, systemic inflammatory response
Nolte, F S; Arnold, K E; Sweat, H; Winton, E F; Funke, G
A 39-year-old male with acute myelogenous leukemia and concomitant porphyria cutanea tarda was admitted to the hospital for consolidation chemotherapy of his leukemia. During his hospitalization, he developed cellulitis of the left hand and persistent bacteremia with a yellow-pigmented, nonfermenting coryneform bacterium that was identified as Aureobacterium sp. The portal of entry for the Aureobacterium infection was probably through the skin lesions due to porphyria cutanea tarda. The infection developed while the patient was receiving vancomycin prophylaxis, and the vancomycin MIC for the isolate was 32 micrograms/ml. PMID:8818896
Uwamino, Yoshifumi; Sugita, Kayoko; Iwasaki, Eisuke; Fujiwara, Hiroshi; Nishimura, Tomoyasu; Hasegawa, Naoki; Iwata, Satoshi
We herein report a case of acute cholangitis and bacteremia caused by a commensal Neisseria species, Neisseria subflava, in an 82-year-old man with cholangiocarcinoma. Emergency endoscopic nasobiliary drainage and cefoperazone/sulbactam therapy were effective. Gram negative coccobacilli were isolated from both blood and bile cultures on 5% sheep blood agar. The isolate was identified as N. subflava biovar perflava by mass spectrometry, a sequence analysis of the 16S rRNA, and biochemical testing. Although biliary infections due to commensal Neisseria are extremely rare, this case demonstrates the possibility of its occurrence in patients undergoing bile duct treatment. PMID:28090057
Rasmussen, Rasmus V.; Fowler, Vance G.; Skov, Robert; Bruun, Niels E.
Summary Staphylococcus aureus bacteremia (SAB) is an urgent medical problem due to its growing frequency and its poor associated outcome. As healthcare delivery increasingly involves invasive procedures and implantable devices, the number of patients at risk for SAB and its complications is likely to grow. Compounding this problem is the growing prevalence of methicillin resistant S. aureus (MRSA) and the dwindling efficacy of vancomycin, long the treatment of choice for this pathogen. Despite the recent availability of several new antibiotics for S. aureus, new strategies for treatment and prevention are required for this serious, common cause of human infection. PMID:21162635
Issa, Hussain; Shorman, Mahmoud; Bseiso, Bahaa; Al-Salem, Ahmed H.
Vibrio cholerae are Gram-negative bacteria that are differentiated into O1/O139 and non-O1/non-O139 serogroups depending on their ability to agglutinate with specific antiserum. In contrast to non-O1/non-0139 Vibrio cholerae, which are more prone to invade the bloodstream, Vibrio cholerae O1 is rarely the cause of bacteremia. We report a case of O1 Vibrio cholera bacteremia and primary peritonitis in a patient with liver cirrhosis. The literature on the subject is also reviewed. PMID:27990208
Esposito, Susanna; Marchisio, Paola; Capaccio, Pasquale; Bellasio, Marta; Semino, Margherita; Dusi, Elisa; Colombo, Rosaria; Pignataro, Lorenzo; Principi, Nicola
To evaluate the incidence and persistence of bacteremia in children undergoing adenoidectomy or adenotonsillectomy for different medical reasons. We enrolled 130 children scheduled for adenoidectomy because of recurrent acute otitis media (rAOM, 15) or persistent otitis media with effusion (pOME, 33), or for adenotonsillectomy because of obstructive sleep apnea syndrome (OSAS, 41) or recurrent tonsillopharyngitis (rTF, 41). Nasopharyngeal aspirates taken just before surgery, swabs of the ablated central adenoidal and tonsillar tissues, and blood samples taken within the first 30s of beginning the operation and 20min after its end were used for bacterial cultures. The incidence of positive blood cultures after the beginning of the operation was significantly higher in the children who underwent adenotonsillectomy than in those who underwent adenoidectomy, and in those with rAOM or rTF than in those with pOME or OSAS. Children with nasopharyngeal colonisation were significantly more likely to have a positive blood culture than those without. Twenty of the 25 children with a positive blood culture (80.0%), had the same bacteria in their nasopharyngeal and adenoidal/tonsillar tissues. Our results show that bacteremia is significantly more frequently associated with adenotonsillectomy than with adenoidectomy, and significantly more frequent in patients with a history of rAOM or rTF.
Lee, Shinwon; Choe, Pyoeng Gyun; Song, Kyoung-Ho; Park, Sang-Won; Kim, Hong Bin; Kim, Nam Joong; Kim, Eui-Chong; Park, Wan Beom; Oh, Myoung-don
About 20% of methicillin-susceptible Staphylococcus aureus (MSSA) isolates have a substantial inoculum effect with cefazolin, suggesting that cefazolin treatment may be associated with clinical failure for serious MSSA infections. There are no well-matched controlled studies comparing cefazolin with nafcillin for the treatment of MSSA bacteremia. A retrospective propensity-score-matched case-control study was performed from 2004 to 2009 in a tertiary care hospital where nafcillin was unavailable from August 2004 to August 2006. The cefazolin group (n = 49) included MSSA-bacteremic patients treated with cefazolin during the period of nafcillin unavailability, while the nafcillin group (n = 84) comprised those treated with nafcillin. Treatment failure was defined as a composite outcome of a change of antibiotics due to clinical failure, relapse, and mortality. Of 133 patients, 41 patients from each group were matched by propensity scores. There were no significant differences in baseline characteristics between the matched groups. The treatment failure rates were not significantly different at 4 or 12 weeks (10% [4/41] versus 10% [4/41] at 4 weeks [P > 0.99] and 15% [6/41] versus 15% [6/41] at 12 weeks [P > 0.99]). Cefazolin treatment was interrupted less frequently than nafcillin treatment due to drug adverse events (0% versus 17%; P = 0.02). Cefazolin had clinical efficacy similar to that of nafcillin and was more tolerable than nafcillin for the treatment of MSSA bacteremia. PMID:21825299
Zárate, Mariela S; Giannico, Marina; Colombrero, Cecilia; Smayevsky, Jorgelina
Non-O1, and non-O139 Vibrio cholerae is an infrequent cause of bacteremia. There are no reports of such bacteremia in chronic hemodialysis patients. This work describes the case of a chronic hemodialysis patient that had an episode of septicemia associated with dialysis. Blood cultures were obtained and treatment was begun with vancomycin and ceftazidime. After 6.5 hours of incubation in the Bact/Alert system there is evidence of gram-negative curved bacilli that were identified as Vibrio cholerae by conventional biochemical tests, API 20 NE and the VITEK 2 system. This microorganism was sent to the reference laboratory for evaluation of serogroup and virulence factors and was identified as belonging to the non-O1 and non-O139 serogroup. The cholera toxin, colonization factor and heat-stable toxin were not detected. The isolate was susceptible to ampicillin, trimethoprim-sulfamethoxazole, ciprofloxacin, tetracycline, ceftazidime and cefotaxime by the disk diffusion method and the VITEK 2 system. The patient received intravenous ceftazidime for a 14 day- period and had a favorable outcome.
Livingston, Lachara V; Perez-Colon, Elimarys
Streptococcus intermedius is a member of the Streptococcus anginosus group of bacteria. This group is part of the normal flora of the oropharynx, genitourinary, and gastrointestinal tracts; however, they have been known to cause a variety of purulent infections including meningitis, endocarditis, and abscesses, even in immunocompetent hosts. In particular, S. intermedius has been associated with the development of liver and brain abscesses. There have been several case reports of S. intermedius liver abscesses with active periodontal infection. To our knowledge, however, there has not been a case following a routine dental procedure. In fact, the development of liver abscesses secondary to dental procedures is very rare in general, and there are only a few case reports in the literature describing this in relation to any pathogen. We present a rare case of S. intermedius bacteremia and liver abscess following a dental cleaning. This case serves to further emphasize that even routine dental procedures can place a patient at risk of the development of bacteremia and liver abscesses. For this reason, the clinician must be sure to perform a detailed history and careful examination. Timely diagnosis of pyogenic liver abscesses is vital, as they are typically fatal if left untreated.
Nishioka, Hiroaki; Kozuki, Tomohiro; Kamei, Hiroki
Capnocytophaga canimorsus is part of normal gingival flora of dogs and cats. The organism can cause septicemia, meningitis, and endocarditis in humans after contact with dogs or cats. In spite of the frequency of gastrointestinal symptoms in C. canimorsus infection patients, specific gastrointestinal disease or clinical images have not been reported. We report a case of C. canimorsus bacteremia presenting with acute cholecystitis in elderly woman. She suffered from general fatigue and right upper abdominal pain. She had leukocytosis and abnormal liver function tests. She showed abnormal findings of the gallbladder by abdominal computed tomography and ultrasonography. She was diagnosed with acute cholecystitis without gallstones and was administered with antibiotics. C. canimorsus was isolated from blood cultures. A history of an insignificant wound secondary to a dog bite was elicited. She recovered completely with antibiotic treatment. This case revealed that C. canimorsus bacteremia can be presented with acute cholecystitis, suggesting that C. canimorsus could cause cholecystitis. And this cholecystitis can be treated with antibiotics without operation. Physicians seeing patients with acute cholecysitis should ask questions regarding animal contact.
Turel, Ozden; Kavuncuoglu, Sultan; Hosaf, Emine; Ozbek, Sibel; Aldemir, Esin; Uygur, Turkan; Hatipoglu, Nevin; Siraneci, Rengin
We report an outbreak of Achromobacter xylosoxidans at a neonatal intensive care unit. We aimed to present clinical, laboratory and treatment data of the patients. All consecutive episodes of bacteremia due to A. xylosoxidans at our neonatal intensive care unit, beginning with the index case detected at November 2009 until cessation of the outbreak in April 2010, were evaluated retrospectively. Thirty-four episodes of bacteremia occurred in 22 neonates during a 6-month period. Among the affected, 90% were preterm newborns with gestational age of 32 weeks or less and 60% had birth weight of 1000g or less. Endotracheal intubation, intravenous catheter use, total parenteral nutrition and prolonged antibiotic therapy were the predisposing conditions. Presenting features were abdominal distention, thrombocytopenia and neutropenia. The mortality rate was 13.6% and the majority of isolates were susceptible to piperacillin-tazobactam, carbapenems and trimethoprim-sulfametoxazole, and resistant to gentamycin. More than half were breakthrough infections. Despite intensive efforts to control the outbreak by standard methods of hand hygiene, patient screening and isolation, containment could be achieved only after the neonatal intensive care unit was relocated. The investigation was not able to single out the source of the outbreak. A. xylosoxidans has the potential to cause serious infections in premature babies. More studies are needed to determine the importance of different sources of infection in hospital units. Copyright © 2013 Elsevier Editora Ltda. All rights reserved.
Velusamy, Senthil Kumar; Fine, Daniel H; Velliyagounder, Kabilan
Streptococcus mutans is the primary agent of dental caries, which is often detected in transient bacteremia. Lactoferrin is a multifunctional glycoprotein showing antibacterial activities against several Streptococcus species. We reported here the prophylactic effect of human lactoferrin (hLF) in a lactoferrin knockout mouse (LFKO-/-) bacteremic model. The hLF treatment significantly cleared S. mutans from the blood and organs of bacteremic mice when compared to the non-hLF treated mice. Further, analysis of serum cytokines, spleen and liver cytokine mRNA levels revealed that hLF prophylaxis modulates their release differently when compared to the non-hLF treated group. C-reactive protein level (P = 0.003) also decreased following hLF prophylaxis in S. mutans induced bacteremic mice. Additional quantitative RT-PCR analysis revealed that hLF prophylaxis significantly decreased the expression level of IFN-γ, TNF-α, IL-1β, IL-6, MPO and iNOS in spleen and liver. These results suggested that the hLF protects the host against S. mutans-induced experimental bacteremia.
Gulen, Tugba Arslan; Guner, Rahmet; Celikbilek, Nevreste; Keske, Siran; Tasyaran, Mehmet
A. baumannii is an important nosocomial pathogen associated with high mortality, morbidity and medical cost. The aim of this study was to investigate risk factors for MDR A. baumannii bacteremia and also evaluate cost of hospitalization of these patients. Study was conducted in Ankara Atatürk Training and Research Hospital. Patients who were hospitalized in ICU and diagnosed for nosocomial blood stream infection (BSI) between January 2007 and December 2010 were checked retrospectively. Patients with nosocomial BSI caused by multidrug resistant A. baumannii were compared with the patients who had BSI caused by other Gram-negative microorganisms in terms of risk factors, mortality and medical costs. In multivariate analysis previous use of carbapenem, quinolone and metronidazole, and SAPS II score were found as independent risk factors. In case group; immunosupression, SAPS II score, and hospital stay until infection were independently associated with mortality in multivariate analysis. Our results suggest that the occurrence of MDR A.baumannii bacteremia was related with the usage of the wide spectrum antibiotics, and mortality rates were increased in patients that high SAPS II scores, long term hospitalization. Infection control procedures and limited antibiotic usage are very important for prevent nosocomial infections. Copyright © 2015 The Authors. Published by Elsevier Ltd.. All rights reserved.
Döring, Gerd; Bragonzi, Alessandra; Paroni, Moira; Aktürk, Firdevs-Fatma; Cigana, Cristina; Schmidt, Annika; Gilpin, Deirdre; Heyder, Susanne; Born, Torsten; Smaczny, Christina; Kohlhäufl, Martin; Wagner, Thomas O F; Loebinger, Michael R; Bilton, Diana; Tunney, Michael M; Elborn, J Stuart; Pier, Gerald B; Konstan, Michael W; Ulrich, Martina
A clinical study to investigate the leukotriene B(4) (LTB(4))-receptor antagonist BIIL 284 in cystic fibrosis (CF) patients was prematurely terminated due to a significantly increased risk of adverse pulmonary events. We aimed to establish the effect of BIIL284 in models of Pseudomonas aeruginosa lung infection, thereby contributing to a better understanding of what could have led to adverse pulmonary events in CF patients. P. aeruginosa DNA in the blood of CF patients during and after acute pulmonary exacerbations and in stable patients with non-CF bronchiectasis (NCFB) and healthy individuals was assessed by PCR. The effect of BIIL 284 treatment was tested in an agar bead murine model of P. aeruginosa lung infection. Bacterial count and inflammation were evaluated in lung and other organs. Most CF patients (98%) and all patients with NCFB and healthy individuals had negative P. aeruginosa DNA in their blood. Similarly, the P. aeruginosa-infected mice showed bacterial counts in the lung but not in the blood or spleen. BIIL 284 treatment decreased pulmonary neutrophils and increased P. aeruginosa numbers in mouse lungs leading to significantly higher bacteremia rates and lung inflammation compared to placebo treated animals. Decreased airway neutrophils induced lung proliferation and severe bacteremia in a murine model of P. aeruginosa lung infection. These data suggest that caution should be taken when administering anti-inflammatory compounds to patients with bacterial infections. © 2013.
Montaño-Remacha, Carmen; Márquez-Cruz, María Dolores; Hidalgo-Guzmán, Pilar; Sánchez-Porto, Antonio; Téllez-Pérez, Francisco de Paula
In January 2014 a possible outbreak of Burkholderia cepacia bacteremia occurred in a hemodialysis center situated in La Linea de la Concepción (Cadiz). An investigation was begun to confirm the outbreak, identify the source, and implement control measures. A descriptive analysis was performed to describe the characteristics of the patients affected with Burkholderia cepacia bacteremia from November 2013 to February 2014. Environmental samples were taken. A molecular typing study was performed using pulsed field gel electrophoresis (SpeI PFGE) and MLST analysis in order to determine the genetic similarity between the isolates. The bacterium was isolated from blood cultures of 7 patients during the study period. Three of the samples (2 of which were also cases) were endoluminal fluid from catheter locks, and 4 chlorhexidine bottle samples. The patients were coincident in 2 of the 6 work shifts. The mean age of the cases was 67 years of whom 57% were women. Human samples and an environmental sample was analyzed and found to be genetically identical (ST653 clone). The analysis confirmed the outbreak of Burkholderia cepacia, with 7 cases among the patients of the hemodialysis center. The outbreak was due to the same strain, probably a common source and secondary transmission from person to person. Copyright © 2015 Elsevier España, S.L.U. y Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica. All rights reserved.
Bruhn, Kevin W.; Pantapalangkoor, Paul; Nielsen, Travis; Tan, Brandon; Junus, Justin; Hujer, Kristine M.; Wright, Meredith S.; Bonomo, Robert A.; Adams, Mark D.; Chen, Wangxue; Spellberg, Brad
Background. Acinetobacter baumannii is one of the most antibiotic-resistant pathogens. Defining mechanisms driving pathogenesis is critical to enable new therapeutic approaches. Methods. We studied virulence differences across a diverse panel of A. baumannii clinical isolates during murine bacteremia to elucidate host-microbe interactions that drive outcome. Results. We identified hypervirulent strains that were lethal at low intravenous inocula and achieved very high early, and persistent, blood bacterial densities. Virulent strains were nonlethal at low inocula but lethal at 2.5-fold higher inocula. Finally, relatively avirulent (hypovirulent) strains were nonlethal at 20-fold higher inocula and were efficiently cleared by early time points. In vivo virulence correlated with in vitro resistance to complement and macrophage uptake. Depletion of complement, macrophages, and neutrophils each independently increased bacterial density of the hypovirulent strain but insufficiently to change lethality. However, disruption of all 3 effector mechanisms enabled early bacterial densities similar to hypervirulent strains, rendering infection 100% fatal. Conclusions. The lethality of A. baumannii strains depends on distinct stages. Strains resistant to early innate effectors are able to establish very high early bacterial blood density, and subsequent sustained bacteremia leads to Toll-like receptor 4–mediated hyperinflammation and lethality. These results have important implications for translational efforts to develop therapies that modulate host-microbe interactions. PMID:25378635
Alvarez-Lerma, Francisco; Oliva, Glòria; Ferrer, Joan M; Riera, Alba; Palomar, Mercedes
The nationwide Bacteremia Zero (BZ) Project consists in the simultaneous implementation of measures to prevent central venous catheter-related bacteremia (CVC-B) in critically ill patients and in the development of an integral safety plan. The objective is to present the results obtained after the implementation of the BZ project in the ICUs of the Autonomous Community of Catalonia, Spain. All patients admitted to ICUs in Catalonia participating in the ENVIN-HELICS registry between January 2009 and June 2010 were included. Information was provided by 36 (92.3%) of the total possible 39 ICUs. A total of 281 episodes of CVC-B were diagnosed (overall rate of 2.53 episodes per 1000 days of CVC). The rates have varied significantly between ICUs that participated in the project for more or less than 12 months (2.17 vs. 4.27 episodes per 1000 days of CVC, respectively; p<.0001). The implementation of the BZ Project in Catalonia has been associated with a decrease greater than 40% in the CVC-B rates in the ICUs of this community, which is much higher than the initial objective of 4 episodes per 1000 days of CVC). Copyright © 2014. Published by Elsevier Espana.
Cheguirián, M L; Carvajal, L R; Ledesma, E M; Enrico, M C; Reale, A L; Culasso, C; Bertoni, L
The purpose of our research was to know the frequency of microorganisms causing bacteremia and/or fungemia in oncology patients from Hospital de Niños de Córdoba, as well as to describe the antimicrobial susceptibility patterns of bacteria isolated from January 2006 to April 2007. A total of 59 bacteremia and fungemia cases in 44 patients were studied. From the total number of isolations, 45.8% were gram-negative bacilli, 35.6% were gram-positive cocci, and 18.6% were yeasts. The global distribution of the most prevalent microorganisms was the following: Klebsiella spp. 15.3%; Staphylococcus aureus and Candida parapsilosis 11.9%; coagulase-negative staphylococci 10.2%; Escherichia coli 8.5%, and Pseudomonas aeruginosa 6.8%. More than 40% (41.2%) of enterobacteria showed an extended-spectrum beta-lactamase phenotype, and 20.0% of non-fermenting gram-negative bacilli were multi-resistant to tested antibiotics, while 38.5% of Staphylococcus spp. were methicillin-resistant. In conclusion, the most prevalent microorganisms were gram-negative bacilli, and within this group, enterobacteria evidenced a higher percentage of resistance to tested antibiotics.
Turnidge, John D.; Munckhof, Wendy J.; Robinson, J. Owen; Korman, Tony M.; O'Sullivan, Matthew V. N.; Anderson, Tara L.; Roberts, Sally A.; Warren, Sanchia J. C.; Coombs, Geoffrey W.; Tan, Hui-Leen; Gao, Wei; Johnson, Paul D. R.; Howden, Benjamin P.
An elevated vancomycin MIC is associated with poor outcomes in Staphylococcus aureus bacteremia (SAB) and is reported in patients with methicillin-susceptible S. aureus (MSSA) bacteremia in the absence of vancomycin treatment. Here, using DNA microarray and phenotype analysis, we investigated the genetic predictors and accessory gene regulator (agr) function and their relationship with elevated vancomycin MIC using blood culture isolates from a multicenter binational cohort of patients with SAB. Specific clonal complexes were associated with elevated (clonal complex 8 [CC8] [P < 0.001]) or low (CC22 [P < 0.001], CC88 [P < 0.001], and CC188 [P = 0.002]) vancomycin MIC. agr dysfunction (P = 0.014) or agr genotype II (P = 0.043) were also associated with an elevated vancomycin MIC. Specific resistance and virulence genes were also linked to an elevated vancomycin MIC, including blaZ (P = 0.002), sea (P < 0.001), clfA (P < 0.001), splA (P = 0.001), and the arginine catabolic mobile element (ACME) locus (P = 0.02). These data suggest that inherent organism characteristics may explain the link between elevated vancomycin MICs and poor outcomes in patients with SAB, regardless of the antibiotic treatment received. A consideration of clonal specificity should be included in future research when attempting to ascertain treatment effects or clinical outcomes. PMID:25031442
Kim, Youie; Shin, Ju Ae; Han, Seung Beom; Cho, Bin; Jeong, Dae Chul; Kang, Jin Han
Although some cases of recurrent bacteremia due to Campylobacter jejuni have been reported in immunocompromised patients, antibiotic treatment strategies to eradicate C. jejuni and prevent recurrent infections in immunocompromised patients have not been established. Authors' experience of such rare cases should be shared for improving patients' outcomes. An 18-year-old boy with hypogammaglobulinemia, who received intravenous immunoglobulin replacement therapy every 3 weeks, was admitted to hospital repeatedly due to recurrent diarrhea and cellulitis of the leg. The patient was admitted 6 times, and among them, C. jejuni was isolated from blood cultures 4 times and stool cultures 2 times. The patient experienced recurrent C. jejuni enteritis and bacteremia 5 times despite macrolide therapy. Doxycycline was administered for 3 months after the fifth admission. Ten months after the completion of doxycycline therapy for 3 months, C. jejuni enteritis relapsed; however, since then, recurrent infection has not occurred for 10 months. Immunocompromised patients can experience recurrent C. jejuni infection despite prolonged antibiotic therapy. Further studies to establish appropriate antibiotic therapy for eradicating colonized C. jejuni and preventing recurrent infection are needed.
Taniyama, Daisuke; Abe, Yoshihiko; Sakai, Tetsuya; Kikuchi, Takahide; Takahashi, Takashi
Streptococcus canis (Sc) is a zoonotic pathogen that is transferred mainly from companion animals to humans. One of the major virulence factors in Sc is the M-like protein encoded by the scm gene, which is involved in anti-phagocytic activities, as well as the recruitment of plasminogen to the bacterial surface in cooperation with enolase, and the consequent enhancement of bacterial transmigration and survival. This is the first reported human case of uncomplicated bacteremia following a dog bite, caused by Streptococcus canis harboring the scm gene. The similarity of the 16S rRNA from the infecting species to that of the Sc type strain, as well as the amplification of the species-specific cfg gene, encoding a co-hemolysin, was used to confirm the species identity. Furthermore, the isolate was confirmed as sequence type 9. The partial scm gene sequence harbored by the isolate was closely related to those of other two Sc strains. While this isolate did not possess the erm(A), erm(B), or mef(A), macrolide/lincosamide resistance genes, it was not susceptible to azithromycin: its susceptibility was intermediate. Even though human Sc bacteremia is rare, clinicians should be aware of this microorganism, as well as Pasteurella sp., Prevotella sp., and Capnocytophaga sp., when examining and treating patients with fever who maintain close contact with companion animals.
Maguire, Patrick J; Power, Karen A; Downey, Andrew F; O'Higgins, Amy C; Sheehan, Sharon R; Turner, Michael J
To examine, in the setting of maternal bacteremia, the implications for the diagnosis of maternal sepsis of customizing the systemic inflammatory response syndrome (SIRS) criteria for physiologic changes of pregnancy. Women with maternal bacteremia in a tertiary maternity hospital during 2009-2014 were identified. Records were retrospectively reviewed to determine whether they fulfilled the criteria for diagnosis of sepsis based on either the standard SIRS parameters derived from the Surviving Sepsis Campaign or SIRS parameters customized for pregnancy. Diagnosis of sepsis was based on the presence of two or more SIRS criteria, in conjunction with infection, during the hour before and the 6 hours after phlebotomy for blood culture. Of 93 women with bacteremia, 61 (66%) would have been diagnosed with sepsis based on standard criteria compared with 52 (56%) based on customized criteria (P=0.18). Seventeen women had a diagnosis of sepsis based on the standard but not the customized criteria, while eight women had sepsis based on the customized but not the standard criteria. In maternal bacteremia, customized SIRS criteria do not increase the rate of diagnosis of sepsis. Prospective studies should investigate whether the introduction of customized SIRS criteria can improve clinical outcomes. Copyright © 2016 International Federation of Gynecology and Obstetrics. Published by Elsevier Ireland Ltd. All rights reserved.
Li, Julius; Echevarria, Kelly L; Traugott, Kristi A
Methicillin-susceptible Staphylococcus aureus (MSSA) bacteremia is associated with high morbidity and mortality. Traditionally, antistaphylococcal penicillins (ASPs) have been considered the agents of choice for the treatment of MSSA bacteremia. Vancomycin has been demonstrated to have poorer outcomes in several studies and is only recommended for patients with severe penicillin allergies. Although cefazolin is considered as an alternative to the ASPs for patients with nonsevere penicillin allergies, cefazolin offers several pharmacologic advantages over ASPs, such as more convenient dosing regimens, and antimicrobial stewardship programs are increasingly using cefazolin as the preferential agent for MSSA infections as part of cost-saving initiatives. Concerns about susceptibility to hydrolysis by type A β-lactamases, particularly at high inocula seen in deep-seated infections such as endocarditis; selective pressures from unnecessary gram-negative coverage; and lack of comparative clinical data have precluded recommending cefazolin as a first-line therapy for MSSA bacteremia. Recent clinical studies, however, have suggested similar clinical efficacy but better tolerability, with lower rates of discontinuation due to adverse drug reactions, of cefazolin compared with ASPs. Other variables, such as adequate source control (e.g., intravascular catheter removal, debridement, or drainage) and enhanced pharmacodynamics through aggressive cefazolin dosing, may mitigate the role of cefazolin inoculum effect and factor into determining improved clinical outcomes. In this review, we highlight the utility of cefazolin versus ASPs in the treatment of MSSA bacteremia with a focus on clinical efficacy and safety. © 2017 Pharmacotherapy Publications, Inc.
Young, Heather; Knepper, Bryan C.; Price, Connie S.; Heard, Susan
In this prospective cohort with Staphylococcus aureus bacteremia, transesophageal echocardiography (TEE) was performed in 24% of cases. Consulting Infectious Diseases physicians most frequently cited low suspicion for endocarditis due to rapid clearance of blood cultures and the presence of a secondary focus requiring an extended treatment duration as reasons for foregoing TEE. PMID:27833929
Foucault, C.; Raoult, D.; Brouqui, P.
Chronic Bartonella quintana bacteremia is known to occur in homeless people exposed to lice. We present here the results of an open randomized trial performed to evaluate the efficacy of doxycycline in combination with gentamicin in the eradication of B. quintana bacteremia. From 1 January 2001 to 1 April 2002, homeless people with blood cultures positive for B. quintana were randomized to receive either no treatment (untreated controls) or a combination of gentamicin (3 mg/kg of body weight/day intravenously for 14 days) and doxycycline (200 mg/day orally for 28 days). Patients were evaluated from the results of blood cultures performed between day 28 (the end of treatment) and day 90 postinclusion. Intention-to-treat analysis of 20 included patients showed eradication of bacteremia in 7 out of 9 treated patients versus 2 out of 11 untreated controls (P = 0.01). In the per-protocol analysis, eradication was obtained for 7 out of 7 treated patients versus 2 out of 9 untreated controls (P = 0.003). This study demonstrates the efficiency of the combination of doxycycline and gentamicin in eradicating B. quintana bacteremia. PMID:12821469
Avery, R; Kalaycio, M; Pohlman, B; Sobecks, R; Kuczkowski, E; Andresen, S; Mossad, S; Shamp, J; Curtis, J; Kosar, J; Sands, K; Serafin, M; Bolwell, B
Vancomycin-resistant enterococcal (VRE) infection is a growing threat. We studied the incidence, risk factors, and clinical course of early-onset VRE bacteremia in allogeneic hematopoietic stem cell transplant recipients. We carried out a chart review of 281 allogeneic hematopoietic stem cell transplant recipients from 1997-2003, including preparative regimen, diagnosis, status of disease, graft-versus-host disease prophylaxis, antimicrobial therapy, and survival. VRE bacteremia developed in 12/281 (4.3%) recipients; 10 (3.6%) were within 21 days of transplant. Diagnoses were acute leukemia (7), NHL (2), and MDS (1). In all, 70% had refractory/relapsed disease; 30% were in remission. In total, 50% had circulating blasts. Nine of 10 had matched unrelated donors (7/9 with CD8+ T-cell depletion). The average time to positive VRE cultures was 15 days; average WBC was 0.05, and 80% had concomitant infections. Despite treatment, all patients died within 73 days of VRE bacteremia. Intra-abdominal complications were common. Causes of death included bacterial or fungal infection, multiorgan failure, VOD, ARDS, and relapse. A total of 60% of patients engrafted neutrophils, but none engrafted platelets. Early VRE bacteremia after allogeneic bone marrow transplant is associated with a rapidly deteriorating clinical course, although not always directly due to VRE. Early VRE may be a marker for the critical condition of these high-risk patients at the time of transplant.
Satlin, Michael J.; Soave, Rosemary; Racanelli, Alexandra C.; Shore, Tsiporah B.; van Besien, Koen; Jenkins, Stephen G.; Walsh, Thomas J.
As antimicrobial resistance increases, understanding the current epidemiology of bloodstream infections (BSIs) in hematopoietic stem cell transplant (HSCT) recipients is essential to guide empirical antimicrobial therapy. We therefore reviewed microbial etiologies, timing and outcomes of BSIs in patients who were transplanted from September 2007–December 2011. Vancomycin-resistant enterococci (VRE) were the most common pathogens in allogeneic HSCT recipients and 4th most common after autologous transplantation. VRE did not cause any of 101 BSIs in neutropenic patients who were not receiving antibacterials, but caused 32 (55%) of 58 BSIs in neutropenic patients receiving a broad-spectrum β-lactam agent (P<0.001). Rates of septic shock and seven-day mortality were 5% and 0% for streptococcal bacteremia, 12% and 18% for VRE bacteremia, and 20% and 14% for Gram-negative bacteremia. In conclusion, VRE bacteremia was the most common BSI in allogeneic HSCT recipients, occurred primarily in neutropenic patients receiving broad-spectrum β-lactams, and was associated with poor outcomes. PMID:24559288
Kocuria species are unusual human pathogens isolated most commonly from immunocompromised hosts, such as transplant recipients and cancer patients undergoing chemotherapy, or from patients with chronic medical conditions. A case of catheter-related bacteremia with pulmonary septic emboli in a pregnant adult female without chronic medical conditions is described. A review of other reported Kocuria infections is provided. PMID:21864336
Humphries, Romney M.; Mattison, H. Reid; Miles, Jessica E.; Simpson, Edward R.; Corbett, Ian J.; Schmitt, Bryan H.; May, M.
Francisella philomiragia is a very uncommon pathogen of humans. Diseases caused by it are protean and have been reported largely in near-drowning victims and those with chronic granulomatous disease. We present a case of F. philomiragia pneumonia with peripheral edema and bacteremia in a renal transplant patient and review the diverse reports of F. philomiragia infections. PMID:26400786
Lee, Nan-Yao; Lee, Ching-Chi; Li, Chia-Wen; Li, Ming-Chi; Chen, Po-Lin; Chang, Chia-Ming; Ko, Wen-Chien
A new category of cefepime susceptibility, susceptible dose dependent (SDD), for Enterobacteriaceae, has been suggested to maximize its clinical use. However, clinical evidence supporting such a therapeutic strategy is limited. A retrospective study of 305 adults with monomicrobial Enterobacter cloacae bacteremia at a medical center from 2008 to 2012 was conducted. The patients definitively treated with in vitro active cefepime (cases) were compared with those treated with a carbapenem (controls) to assess therapeutic effectiveness. The 30-day crude mortality rate is the primary endpoint, and clinical prognostic factors are assessed. Of 144 patients receiving definitive cefepime or carbapenem therapy, there were no significant differences in terms of age, sex, comorbidity, source of bacteremia, disease severity, or 30-day mortality (26.4% versus 22.2%; P = 0.7) among those treated with cefepime (n = 72) or a carbapenem (n = 72). In the multivariate analysis, the presence of critical illness, rapidly fatal underlying disease, extended-spectrum beta-lactamase (ESBL) producers, and cefepime-SDD (cefepime MIC, 4 to 8 μg/ml) isolates was independently associated with 30-day mortality. Moreover, those infected by cefepime-SDD isolates with definitive cefepime therapy had a higher mortality rate than those treated with a carbapenem (5/7 [71.4%], versus 2/11 [18.2%]; P = 0.045). Cefepime is one of the therapeutic alternatives for cefepime-susceptible E. cloacae bacteremia but is inefficient for cases of cefepime-SDD E. cloacae bacteremia compared with carbapenem therapy.
Lee, Nan-Yao; Lee, Ching-Chi; Li, Chia-Wen; Li, Ming-Chi; Chen, Po-Lin; Chang, Chia-Ming
A new category of cefepime susceptibility, susceptible dose dependent (SDD), for Enterobacteriaceae, has been suggested to maximize its clinical use. However, clinical evidence supporting such a therapeutic strategy is limited. A retrospective study of 305 adults with monomicrobial Enterobacter cloacae bacteremia at a medical center from 2008 to 2012 was conducted. The patients definitively treated with in vitro active cefepime (cases) were compared with those treated with a carbapenem (controls) to assess therapeutic effectiveness. The 30-day crude mortality rate is the primary endpoint, and clinical prognostic factors are assessed. Of 144 patients receiving definitive cefepime or carbapenem therapy, there were no significant differences in terms of age, sex, comorbidity, source of bacteremia, disease severity, or 30-day mortality (26.4% versus 22.2%; P = 0.7) among those treated with cefepime (n = 72) or a carbapenem (n = 72). In the multivariate analysis, the presence of critical illness, rapidly fatal underlying disease, extended-spectrum beta-lactamase (ESBL) producers, and cefepime-SDD (cefepime MIC, 4 to 8 μg/ml) isolates was independently associated with 30-day mortality. Moreover, those infected by cefepime-SDD isolates with definitive cefepime therapy had a higher mortality rate than those treated with a carbapenem (5/7 [71.4%], versus 2/11 [18.2%]; P = 0.045). Cefepime is one of the therapeutic alternatives for cefepime-susceptible E. cloacae bacteremia but is inefficient for cases of cefepime-SDD E. cloacae bacteremia compared with carbapenem therapy. PMID:26416853
Kimball, Joanna; Smith, L. Patrick; Salzer, William
Herbaspirillum spp. are Gram-negative bacteria that inhabit soil and water. Infections caused by these organisms have been reported in immunocompromised hosts. We describe severe community-acquired pneumonia and bacteremia caused by Herbaspirillum aquaticum or H. huttiense in an immunocompetent adult male. PMID:26179298
Muder, R R; Brennen, C; Wagener, M M; Goetz, A M
The clinical features, microbiological characteristics, and outcomes of 163 episodes of bacteremia occurring at a long-term-care facility were evaluated. The rate of nosocomial bacteremia increased from 0.20 to 0.36 cases/1,000 patient-days from 1985 to 1989; there was a parallel increase in the rate of all nosocomial infections combined. Bacteremia was documented in 6.5% of all hospital-acquired infections. The majority of isolates were gram-negative, and Providencia stuartii was the most common gram-negative species. Staphylococcus aureus was the most frequent isolate; one-third of S. aureus strains were resistant to methicillin. Bacteremia was polymicrobial in 36 episodes (22%), 14 of which involved an enterococcal species. Portals of entry included the urinary tract (55%), the respiratory tract (11%), and soft tissue (9%). Overall mortality was 21.5%. Death was significantly associated with residence on the intermediate-care unit, the presence of a respiratory infection, a change in mental status, and relatively recent admission. Optimal management of bacterial infection in a long-term-care setting requires the availability of blood culture results. Initial decisions about antibiotic therapy should be made in light of the likelihood of infection with multiresistant organisms and of polymicrobial infection.
During six months, we obtained Enterobacteriaceae isolates from patients with Gram-negative bacteremia at a 1250-bed teaching hospital in St. Louis, Missouri, and compared carbapenem susceptibility with the presence of blaKPC, a transferable carbapenemase gene. Three (1.2%) out of 243 isolates were ...
Kessler, Robert; Nisa, Shahista; Hazen, Tracy H; Horneman, Amy; Amoroso, Anthony; Rasko, David A; Donnenberg, Michael S
A 55-year-old man with well-controlled HIV had severe diarrhea for 3 weeks and developed multiorgan dysfunction and bacteremia due to Escherichia coli. The genome of the patient's isolate had features characteristic of extraintestinal pathogenic E. coli and genes distantly related to those defining enteropathogenic E. coli.
Bassiouny, Dina M.; Matar, Yomna
Kocuria kristinae is opportunistic Gram-positive cocci from the family Micrococcaceae. It is usually considered part of the normal flora that rarely is isolated from clinical specimens. Here, we report a case of Kocuria kristinae bacteremia; to the best of our knowledge, this is the first report from Egypt. PMID:27872773
Stewart, Lygia; Griffiss, J McLeod; Jarvis, Gary A; Way, Lawrence W
Gallstone bacteria provide a reservoir for biliary infections. Slime production facilitates adherence, whereas beta-glucuronidase and phospholipase generate colonization surface. These factors facilitate gallstone formation, but their influence on infection severity is unknown. Two hundred ninety-two patients were studied. Gallstones, bile, and blood (as applicable) were cultured. Bacteria were tested for beta-glucuronidase/phospholipase production and quantitative slime production. Infection severity was correlated with bacterial factors. Bacteria were present in 43% of cases, 13% with bacteremia. Severe infections correlated directly with beta-glucuronidase/phospholipase (55% with vs 13% without, P < 0.0001), but inversely with slime production (55 vs 8%, slime <75 or >75, P = 0.008). Low slime production and beta-glucuronidase/phospholipase production were additive: Severe infections were present in 76% with both, but 10% with either or none (P < 0.0001). beta-Glucuronidase/phospholipase production facilitated bactibilia (86% with vs 62% without, P = 0.03). Slime production was 19 (+/-8) vs 50 (+/-10) for bacteria that did or did not cause bacteremia (P = 0.004). No bacteria with slime >75 demonstrated bacteremia. Bacteria-laden gallstones are biofilms whose characteristics influence illness severity. Factors creating colonization surface (beta-glucuronidase/phospholipase) facilitated bacteremia and severe infections; but abundant slime production, while facilitating colonization, inhibited detachment and cholangiovenous reflux. This shows how properties of the gallstone biofilm determine the severity of the associated illness.
Teng, Jade L. L.; Huang, Yi; Curreem, Shirly O. T.; Tsui, Stephen K. W.
We report the draft genome sequence of Catabacter hongkongensis, a catalase-positive bacterium which causes bacteremia with high mortality. The 3.2-Mb genome contains 3,161 protein coding sequences, including putative catalase and motility-related proteins, and antibiotic resistance genes, which could be important for its virulence and adaptation to diverse environments. PMID:25999561
VanWagoner, Timothy M.; Seale, Thomas W.; Mussa, Huda J.; Cole, Brett K.; Whitby, Paul W.; Stull, Terrence L.
Haemophilus influenzae is an important cause of invasive disease. The infant rat is the accepted model of invasive H. influenzae disease. Here, we report the genome sequences of six nontypeable H. influenzae strains that establish bacteremia in the infant rat. PMID:26404588
Lee, Sai-Cheong; Huang, Shie-Shian; Lee, Chao-Wei; Fung, Chang-Phone; Lee, Ning; Shieh, Wen-Bin; Siu, LK
Background Ertapenem is a once-a-day carbapenem and has excellent activity against many gram-positive and gram-negative aerobic, facultative, and anaerobic bacteria. The susceptibility of isolates of community-acquired bacteremia to ertapenem has not been reported yet. The present study assesses the in vitro activity of ertapenem against aerobic and facultative bacterial pathogens isolated from patients with community-acquired bacteremia by determining and comparing the MICs of cefepime, cefoxitin, ceftazidime, ceftriaxone, ertapenem, piperacillin, piperacillin-tazobactam, ciprofloxacin, amikacin and gentamicin. The prevalence of extended broad spectrum β-lactamases (ESBL) producing strains of community-acquired bacteremia and their susceptibility to these antibiotics are investigated. Methods Aerobic and facultative bacteria isolated from blood obtained from hospitalized patients with community-acquired bacteremia within 48 hours of admission between August 1, 2004 and September 30, 2004 in Chang Gung Memorial Hospital at Keelung, Taiwan, were identified using standard procedures. Antimicrobial susceptibility was evaluated by Etest according to the standard guidelines provided by the manufacturer and document M100-S16 Performance Standards of the Clinical Laboratory of Standard Institute. Antimicrobial agents including cefepime, cefoxitin, ceftazidime, ceftriaxone, ertapenem, piperacillin, piperacillin-tazobactam, ciprofloxacin, amikacin and gentamicin were used against the bacterial isolates to test their MICs as determined by Etest. For Staphylococcus aureus isolates, MICs of oxacillin were also tested by Etest to differentiate oxacillin-sensitive and oxacillin-resistant S. aureus. Results Ertapenem was highly active in vitro against many aerobic and facultative bacterial pathogens commonly recovered from patients with community-acquired bacteremia (128/159, 80.5 %). Ertapenem had more potent activity than ceftriaxone, piperacillin-tazobactam, or ciprofloxacin
Camargo, L F; Strabelli, T M; Ribeiro, F G; Mendes, C M; Uip, D E; Bellotti, G M; Pileggi, F J
We conducted a retrospective study to establish mortality rates and prevalence of nosocomial bacteremias at our institute. We found 1.21 nosocomial bacteremias per 100 hospital discharges with an overall Mortality rate of 29.5%. Primary bacteremias increased during the four-year-study-period from 31 to 41%. Staphylococcus, both coagulase-positive and coagulase-negative, was the bacteria most frequently isolated. An abrupt increase in the isolation of P.aeruginosa occurred in 1992. We concluded that a blood-culture surveillance program is required for determining an endemic rate.
Chen, Po-Lin; Tsai, Liang-Miin; Kan, Chung-Dann; Ko, Wen-Chien
Nontyphoid Salmonella (NTS) can cause invasive diseases in the elderly. Notably, the most feared complication of NTS bacteremia is endovascular infection. The risk factors for infected aortic aneurysm include old age and atherosclerosis. Extended use of antimicrobial therapy (> 2 weeks) for NTS bacteremia should be considered for those who demonstrate the risk factors for endovascular infection, even when a metastatic focus is clinically elusive. Herein, we report the case of a 75-year-old patient with diabetes mellitus, hypertension, chronic kidney disease, and myocardial infarction who died of an infected aortic aneurysm despite 3 weeks of antibiotic therapy that was administered to treat the initial NTS bacteremia.
Lee, Shinwon; Kwon, Ki Tae; Kim, Hye-In; Chang, Hyun Ha; Lee, Jong-Myung; Choe, Pyoeng Gyun; Park, Wan Beom; Kim, Nam Joong; Oh, Myoung-Don; Song, Do Young; Kim, Shin-Woo
Cefazolin is a common antibiotic for methicillin-susceptible Staphylococcus aureus (MSSA) bacteremia. Type A or C β-lactamase-producing MSSA frequently shows the cefazolin inoculum effect (CIE). However, the clinical implication of the CIE for MSSA bacteremia is obscure. MSSA bacteremic patients treated with cefazolin were included in a retrospective cohort study. The blaZ gene of the isolates was sequenced to identify the type of β-lactamase. The patients whose isolates showed a ≥4-fold increase in cefazolin, the minimal inhibitory concentration (MIC) at the high inoculum (∼5×10(7) CFU/ml), were assigned to the CIE-positive group and the remainder to the CIE-negative group. Treatment failure was assessed at 12 weeks after cefazolin was initiated. A total of 113 MSSA bacteremic patients were included. Among the 113 isolates, 57.5% showed the CIE and 77.9% carried the blaZ gene; type A β-lactamase was 15.0% and type C was 40.7%. Persistent bacteremia was more common in the CIE-positive group (9% vs. 0%, p=0.04). Treatment failure rates were higher in the CIE-positive group with high bacterial burden infection, but the difference was not significant (48% vs. 25%, p=0.13). There was no significant difference of failure between groups with high-inoculum MIC ≥16 and ≤1 μg/ml (13% vs. 5%, p=0.31). In the multivariable analysis, underlying cardiovascular diseases, pneumonia, osteoarticular infections, and endocarditis were significant risk factors for treatment failure and the CIE was not significantly associated with treatment failure. The CIE might be associated with persistent bacteremia if cefazolin is used for MSSA bacteremia with a high burden of infections. However, the sites of infections are more important factors for the clinical outcome than the CIE.
Di Gregorio, Sabrina; Perazzi, Beatriz; Ordoñez, Andrea Martinez; De Gregorio, Stella; Foccoli, Monica; Lasala, María Beatriz; García, Susana; Vay, Carlos; Famiglietti, Angela
The emergence of vancomycin intermediate Staphylococcus aureus (VISA) and heterogeneous VISA (hVISA) is of major concern worldwide. Our objective was to investigate the prevalence, phenotypic and molecular features of hVISA strains isolated from bacteremic patients and to determine the clinical significance of the hVISA phenotype in patients with bacteremia. A total of 104 S. aureus blood isolates were collected from a teaching hospital of Argentina between August 2009 and November 2010. No VISA isolate was recovered, and 3 out of 92 patients (3.3%) were infected with hVISA, 2 of them methicillin-resistant S. aureus (MRSA) (4.5% of MRSA). Macro Etest and prediffusion method detected 3/3 and 2/3 hVISA respectively. Considering the type of bacteremia, the three cases were distributed as follows: two patients had suffered multiple episodes of bacteremia (both hVISA strains recovered in the second episode), while only one patient had suffered a single episode of bacteremia with hVISA infection. MRSA bloodstream isolates exhibiting the hVISA phenotype were related to HA-MRSA Cordobes clone (ST5-SCCmec I-spa t149) and MRSA Argentinean pediatric clone (ST100-SCCmec IVNV-spa t002), but not to CA-MRSA-ST30-SCCmec IV-spa t019 clone that was one of the most frequent in our country. Although still relatively infrequent in our hospital, hVISA strains were significantly associated with multiple episodes of bacteremia (p=0.037) and genetically unrelated. PMID:25535825
Liew, Yun Khoon; Awang Hamat, Rukman; van Belkum, Alex; Chong, Pei Pei; Neela, Vasanthakumari
The exoproteome of Staphylococcus aureus contains enzymes and virulence factors that are important for host adaptation. We investigated the exoprotein profiles and cytokine/chemokine responses obtained in three different S. aureus-host interaction scenarios by using two-dimensional gel electrophoresis (2-DGE) and two-dimensional immunoblotting (2D-IB) combined with tandem mass spectrometry (MS/MS) and cytometric bead array techniques. The scenarios included S. aureus bacteremia, skin and soft tissue infections (SSTIs), and healthy carriage. By the 2-DGE approach, 12 exoproteins (the chaperone protein DnaK, a phosphoglycerate kinase [Pgk], the chaperone GroEL, a multisensor hybrid histidine kinase, a 3-methyl-2-oxobutanoate hydroxymethyltransferase [PanB], cysteine synthase A, an N-acetyltransferase, four isoforms of elongation factor Tu [EF-Tu], and one signature protein spot that could not be reliably identified by MS/MS) were found to be consistently present in more than 50% of the bacteremia isolates, while none of the SSTI or healthy-carrier isolates showed any of these proteins. By the 2D-IB approach, we also identified five antigens (methionine aminopeptidase [MetAPs], exotoxin 15 [Set15], a peptidoglycan hydrolase [LytM], an alkyl hydroperoxide reductase [AhpC], and a haptoglobin-binding heme uptake protein [HarA]) specific for SSTI cases. Cytokine and chemokine production varied during the course of different infection types and carriage. Monokine induced by gamma interferon (MIG) was more highly stimulated in bacteremia patients than in SSTI patients and healthy carriers, especially during the acute phase of infection. MIG could therefore be further explored as a potential biomarker of bacteremia. In conclusion, 12 exoproteins from bacteremia isolates, MIG production, and five antigenic proteins identified during SSTIs should be further investigated for potential use as diagnostic markers.
Richards, R. L.; Haigh, R. D.; Pascoe, B.; Sheppard, S. K.; Price, F.; Jenkins, D.; Rajakumar, K.
Staphylococcus aureus bacteremia cases are complicated by bacterial persistence and treatment failure despite the confirmed in vitro susceptibility of the infecting strain to administered antibiotics. A high incidence of methicillin-resistant S. aureus (MRSA) bacteremia cases are classified as persistent and are associated with poorer patient outcomes. It is still unclear how S. aureus evades the host immune system and resists antibiotic treatment for the prolonged duration of a persistent infection. In this study, the genetic changes and associated phenotypic traits specific to S. aureus persistent bacteremia were identified by comparing temporally dispersed isolates from persistent infections (persistent isolates) originating from two independent persistent S. aureus bacteremia cases with the initial infection isolates and with three resolved S. aureus bacteremia isolates from the same genetic background. Several novel traits were associated specifically with both independent sets of persistent S. aureus isolates compared to both the initial isolates and the isolates from resolved infections (resolved isolates). These traits included (i) increased growth under nutrient-poor conditions; (ii) increased tolerance of iron toxicity; (iii) higher expression of cell surface proteins involved in immune evasion and stress responses; and (iv) attenuated virulence in a Galleria mellonella larva infection model that was not associated with small-colony variation or metabolic dormancy such as had been seen previously. Whole-genome sequence analysis identified different single nucleotide mutations within the mprF genes of all the isolates with the adaptive persistence traits from both independent cases. Overall, our data indicate a novel role for MprF function during development of S. aureus persistence by increasing bacterial fitness and immune evasion. PMID:26056388
It is important to use vancomycin in a proper manner to ensure optimal drug exposure. Despite extensive use of vancomycin in children, studies on its optimal trough concentration (Ctrough) in the pediatric population remained rare. This retrospective study included children < 18 years old with culture-confirmed methicillin-resistant Staphylococcus aureus (MRSA) bacteremia who were hospitalized in our institute from January 2010 to April 2014. Clinical characteristics, initial vancomycin dose, Ctrough and clinical/microbiological outcomes were retrospectively collected from medical records. Forty-six MRSA bacteremia cases occurring to the patients with a mean age of 22.0 ± 46.9 months were included and all of them were healthcare-associated. Severe diseases requiring intensive care unit (ICU) stay, mechanical ventilation and/or resulting in death were observed in 57.8% (26/45); all-cause 30-day fatality was 11.1% (5/45). An initial Ctrough ≥ 15 μg/mL was achieved in only 4 (8.7%) cases with an average vancomycin dosage of 40.6 ± 7.9 mg/kg/day. Persistent bacteremia at 48 hours after initiation of vancomycin was observed more frequently in children with initial Ctrough < 10 μg/mL than in those with Ctrough ≥ 10 μg/mL (P = 0.032). However, there was no statistically significant difference between the two groups in terms of 30-day mortality and recurrent bacteremia (P = 0.899, and P = 0.754, respectively). Although initial Ctrough may be a useful parameter for minimizing early microbiological failure, it does not predict 30-day fatality or recurrence in pediatric MRSA bacteremia. Further prospective data on vancomycin dosing are needed to find the optimal drug exposure and clarify its impact on clinical outcomes in pediatric populations. PMID:27914127
Richards, R L; Haigh, R D; Pascoe, B; Sheppard, S K; Price, F; Jenkins, D; Rajakumar, K; Morrissey, J A
Staphylococcus aureus bacteremia cases are complicated by bacterial persistence and treatment failure despite the confirmed in vitro susceptibility of the infecting strain to administered antibiotics. A high incidence of methicillin-resistant S. aureus (MRSA) bacteremia cases are classified as persistent and are associated with poorer patient outcomes. It is still unclear how S. aureus evades the host immune system and resists antibiotic treatment for the prolonged duration of a persistent infection. In this study, the genetic changes and associated phenotypic traits specific to S. aureus persistent bacteremia were identified by comparing temporally dispersed isolates from persistent infections (persistent isolates) originating from two independent persistent S. aureus bacteremia cases with the initial infection isolates and with three resolved S. aureus bacteremia isolates from the same genetic background. Several novel traits were associated specifically with both independent sets of persistent S. aureus isolates compared to both the initial isolates and the isolates from resolved infections (resolved isolates). These traits included (i) increased growth under nutrient-poor conditions; (ii) increased tolerance of iron toxicity; (iii) higher expression of cell surface proteins involved in immune evasion and stress responses; and (iv) attenuated virulence in a Galleria mellonella larva infection model that was not associated with small-colony variation or metabolic dormancy such as had been seen previously. Whole-genome sequence analysis identified different single nucleotide mutations within the mprF genes of all the isolates with the adaptive persistence traits from both independent cases. Overall, our data indicate a novel role for MprF function during development of S. aureus persistence by increasing bacterial fitness and immune evasion.
Background The high prevalence of methicillin-resistant S. aureus (MRSA) has led clinicians to select antibiotics that have coverage against MRSA, usually vancomycin, for empiric therapy for suspected staphylococcal infections. Clinicians often continue vancomycin started empirically even when methicillin-susceptible S. aureus (MSSA) strains are identified by culture. However, vancomycin has been associated with poor outcomes such as nephrotoxicity, persistent bacteremia and treatment failure. The objective of this study was to compare the effectiveness of vancomycin versus the beta-lactam antibiotics nafcillin and cefazolin among patients with MSSA bacteremia. The outcome of interest for this study was 30-day in-hospital mortality. Methods This retrospective cohort study included all adult in-patients admitted to a tertiary-care facility between January 1, 2003 and June 30, 2007 who had a positive blood culture for MSSA and received nafcillin, cefazolin or vancomycin. Cox proportional hazard models were used to assess independent mortality hazards comparing nafcillin or cefazolin versus vancomycin. Similar methods were used to estimate the survival benefits of switching from vancomycin to nafcillin or cefazolin versus leaving patients on vancomycin. Each model included statistical adjustment using propensity scores which contained variables associated with an increased propensity to receive vancomycin. Results 267 patients were included; 14% (38/267) received nafcillin or cefazolin, 51% (135/267) received both vancomycin and either nafcillin or cefazolin, and 35% (94/267) received vancomycin. Thirty (11%) died within 30 days. Those receiving nafcillin or cefazolin had 79% lower mortality hazards compared with those who received vancomycin alone (adjusted hazard ratio (HR): 0.21; 95% confidence interval (CI): 0.09, 0.47). Among the 122 patients who initially received vancomycin empirically, those who were switched to nafcillin or cefazolin (66/122) had 69% lower
Yakut, Nurhayat; Kepenekli, Eda Kadayifci; Karaaslan, Ayse; Atici, Serkan; Akkoc, Gulsen; Demir, Sevliya Ocal; Soysal, Ahmet; Bakir, Mustafa
Acinetobacter ursingii is an aerobic, gram-negative, opportunistic microorganism which is rarely isolated among Acinetobacter species. We present two immunocompetent infants who developed bacteremia due to A. ursingii. The first patient is a two -month- old boy who had been hospitalized in pediatric surgery unit for suspected tracheo-esophageal fistula because of recurrent aspiration pneumonia unresponsive to antibiotic therapy. The second patient is a fourteen -month- old boy with prolonged vomiting and diarrhea. A. ursingii was isolated from their blood cultures. They were successfully treated with ampicillin-sulbactam. Although A. ursingii has recently been isolated from a clinical specimen; reports of infection with A. ursingii in children are rare. A. ursingii should be kept in mind as an opportunistic microorganism in children.
Kishii, Kozue; Kikuchi, Ken; Tomida, Junko; Kawamura, Yoshiaki; Yoshida, Atsushi; Okuzumi, Katsuko; Moriya, Kyoji
Acinetobacter seifertii, a novel species of Acinetobacter, was first reported in 2015. A. seifertii strains were isolated from human clinical specimens (blood, respiratory tract, and ulcer) and hospital environments. Here, we report the first cases of bacteremia caused by A. seifertii in patients with catheter-related bloodstream infection in Japan. The patients favorably recovered, without any complications, after removal of the peripheral intravenous catheters and administration of antibiotics. The pathogens were initially identified as Acinetobacter baumannii, using phenotypic methods and the MicroScan Walkaway System; however, rpoB gene sequence analysis indicated 99.54% similarity to A. seifertii. Moreover, antimicrobial susceptibility testing revealed that one of the strains was not susceptible to gentamicin and ceftazidime. Our report shows that Acinetobacter species other than A. baumannii can also cause nosocomial infections and that accurate methods for the identification of causative agents should be developed.
Parajuli, Narayan Prasad; Bhetwal, Anjeela; Ghimire, Sumitra; Maharjan, Anjila; Shakya, Shreena; Satyal, Deepa; Pandit, Roshan; Khanal, Puspa Raj
Chromobacterium violaceum is a gram negative saprophytic bacterium, prevalent in tropical and subtropical climates. Infections caused by C. violaceum are very uncommon, yet it can cause severe systemic infections with higher mortality when entered into the bloodstream through open wound. A case of symptomatic bacteremia in a woman caused by C. violaceum was identified recently at a tertiary care teaching hospital in Nepal. Timely diagnosis by microbiological methods and rapid administration of antimicrobials led to a successful treatment of this life-threatening infection in this case. From this experience, we suggest to include this bacterium in the differential diagnosis of sepsis, especially when abraded skin is exposed to soil or stagnant water in tropical areas. The precise antimicrobial selection and timely administration should be considered when this infection is suspected. PMID:27980433
Carretto, E; Barbarini, D; Poletti, F; Marzani, F C; Emmi, V; Marone, P
Bacillus cereus has sometimes been implicated in food poisoning and in opportunistic infections of seriously ill patients. This report describes an unusual case of persistent bacteremia and multiple organ failure associated with B. cereus in a patient admitted to our institution for lung cancer. The patient was undergoing treatment with an antimicrobial agent (imipenem) that was shown to be effective against the micro-organism in vitro. No portal of entry for the strain was detected. After treatment with vancomycin, also shown to be effective in vitro, no clinical improvement was noted and the patient died. Molecular studies showed that the same strain caused an episode of pseudobacteremia in another patient admitted to the same ICU room.
Siegman-Igra, Y; Lavochkin, J; Schwartz, D; Konforti, N
A patient with meningitis and bacteremia due to Bacillus cereus is described. The patient had transsphenoidal hypophysectomy for chromophobe adenoma, complicated by rhinorrhea, which was corrected by subarachnoid drainage. Three weeks after removal of the drain, the patient presented with meningitis and died the following day. The causative organism was identified as B. cereus. The literature on Bacillus infections is reviewed with special attention to severe infections. A modified classification is proposed, dividing infections into superficial, closed-space and systemic ones. Sixty-one previously reported cases of systemic Bacillus infections are reviewed according to type of infection (endocarditis, meningitis or pulmonary infection), and the underlying conditions, ways of acquiring the infection, clinical picture and mortality are discussed.
Lundgren, Ingrid S; Heltshe, Sonya L; Smith, Arnold L; Chibwana, Jerome; Fried, Michal W; Duffy, Patrick E
We recorded the reason for presentation to a rural hospital in an area endemic for malaria in 909 children between January 2006 and March 2009. Blood smears were examined for Plasmodium falciparum parasites, and blood spots dried on filter paper were prepared for 464 children. A PCR assay utilizing the stored blood spots was developed for Streptococcus pneumoniae (lytA) and Haemophilus influenzae (pal). Malaria was present in 299 children whose blood was tested by polymerase chain reaction (PCR); 19 had lytA and 15 had pal. The overall prevalence of lytA was 25 of the 464 children, while that of pal was 18 children. Fever was present in 369 children of whom 19 had lytA DNA while 11 had pal DNA detected. Of the 95 afebrile children, six had lytA and seven pal. We conclude that there are no clinical features that distinguish malaria alone from bacteremia alone or the presence of both infections.
Nannini, Esteban C; Ponessa, Adriana; Muratori, Rosa; Marchiaro, Patricia; Ballerini, Viviana; Flynn, Luis; Limansky, Adriana S
A nosocomial polyclonal outbreak associated to bacteremia caused by different Burkholderia cepacia complex (BCC) species and clones is reported. Molecular characterization identified Burkholderia stabilis, Burkholderia contaminans, and Burkholderia ambifaria among BCC isolates obtained from patients in neonatal and adult intensive care units. BCC was also isolated from an intrinsically contaminated ultrasound gel, which constituted the presumptive BCC source. Prior BCC outbreak related to contaminated ultrasound gels have been described in the setting of transrectal prostate biopsy. Outbreak caused strains and/or clones of BCC have been reported, probably because BCC are commonly found in the natural environment; most BCC species are biofilm producers, and different species may contaminate an environmental source. The finding of multiple species or clones during the analysis of nosocomial BCC cases might not be enough to reject an outbreak from a common source.
Kaitwatcharachai, C; Silpapojakul, K; Jitsurong, S; Kalnauwakul, S
The risk of blood stream infections increases in patients undergoing chronic hemodialysis. Outbreaks of infection are usually caused by contamination of the water supply, water treatment, distribution system, or dialyzer reprocessing. We report an outbreak of subclavian catheter-related Burkholderia cepacia bacteremia in nine patients undergoing hemodialysis. Using randomly amplified polymorphic DNA (RAPD) analysis, the bacterial isolates were clonally identical to Burkholderia cepacia isolated from residue of the diluted chlorhexidine-cetrimide solution used to disinfect the transfer forceps. These forceps were used to pick up cotton balls and gauze for dressing the subclavian catheter. Antibiotic therapy failed to cure the infections, and all patients required catheter removal. Pathology showed numerous bacilli embedded in the biofilm on the inner surface of the removed catheters. In conclusion, our study showed that contaminated chlorhexidine-cetrimide solution was the source of a bacteremic outbreak in nine patients who developed catheter-related Burkholderia cepacia infection.
Hardjo Lugito, Nata Pratama; Cucunawangsih; Kurniawan, Andree
Sphingomonas paucimobilis is a yellow-pigmented, glucose nonfermenting, aerobic, Gram negative bacillus of low pathogenicity. This organism was found in the implantation of indwelling catheters, sterile intravenous fluid, or contaminated hospital environment such as tap and distilled water, nebulizer, ventilator, and hemodialysis device. A 55-year-old female was hospitalized for diabetic foot ulcer in the presence of multiple comorbidities: diabetes mellitus, colonic tuberculosis, end-stage renal disease, and indwelling catheters for central venous catheter and hemodialysis. The patient passed away on the 44th day of admission due to septic shock. The organism found on blood culture on the 29th day of admission was multidrug resistant S. paucimobilis. Severe infection and septic shock due to S. paucimobilis have been reported particularly in immunocompromised patients, but there has been only one reported case of death in a premature neonate with septic shock. This is the first reported lethal case of S. paucimobilis bacteremia in an adult patient. PMID:27088020
Wicher, K.; Koscinski, D.
In two long-term studies, the BACTEC radiometric system for detection of bacteremia was evaluated with three culture media each: (i) BACTEC media 6A (for aerobes) and 7B (for anaerobes) plus a thioglycolate medium and (ii) BACTEC media 6A, 7B, and 8A (hypertonic). In study 1, clinically significant isolates were identified in 1,873 (13.9%) of 13,432 blood cultures with all three media. The thioglycolate medium revealed 143 (1.1%) organisms not recovered from the 6A and 7B media. In study 2, isolates were identified in 1,135 (12.9%) of 8,759 cultures with all three media; 104 (1.2%) organisms were isolated only from the hypertonic medium. The increased yield of positive cultures in the three-medium system is likely due to the larger volume of blood cultured.
Kodama, Yuichi; Nishimura, Miho; Nakashima, Kentaro; Ito, Nobuhiro; Fukano, Reiji; Okamura, Jun; Inagaki, Jiro
A 3-year-old girl with acute myeloid leukemia underwent unrelated cord blood stem cell transplantation (UCBT) due to primary induction failure. Fourteen days after UCBT, she developed central venous catheter (CVC)-related bloodstream infection due to Chryseobacterium indologenes. Despite ciprofloxacin and minocycline being administered according to the results of susceptibility, a high grade fever recurred. Therefore, the CVC was removed 21 days after UCBT and symptoms related to CVC infection improved. Although C. indologenes is widely distributed in nature, it is a rare pathogen in humans. Most cases of C. indologenes bacteremia have been found in immunocompromised patients with malignancies and diabetes mellitus. C. indologenes exhibits specific characteristics, including the progression of resistance to antibiotics and the formation of a biofilm. Therefore, removal of the CVC appears to be the most reasonable treatment for CVC infection due to C. indologenes in patients undergoing hematopoietic stem cell transplantation if clinical symptoms do not improve after appropriate antibiotic therapy.
Lorente, L; Jiménez, A; Martín, M M; Castedo, J; Galván, R; García, C; Brouard, M T; Mora, M L
Although there are many studies on catheter-related infection, there are scarce data about the influence of tracheostomy in the incidence of central venous catheter-related bacteremia (CRB). In this cohort study, we found a higher incidence of CRB in patients with tracheostomy than without (11.25 vs. 1.43 per 1,000 catheter-days; odds ratio [OR] = 7.99; 95% confidence interval [CI] = 4.38-infinite; P < 0.001). Besides, we found a higher incidence of CRB in patients with tracheostomy using the jugular access compared to subclavian access (21.64 vs. 5.11 per 1,000 catheter-days; OR = 4.23; 95% CI = 1.44-infinite; P = 0.0097).
Parajuli, Narayan Prasad; Bhetwal, Anjeela; Ghimire, Sumitra; Maharjan, Anjila; Shakya, Shreena; Satyal, Deepa; Pandit, Roshan; Khanal, Puspa Raj
Chromobacterium violaceum is a gram negative saprophytic bacterium, prevalent in tropical and subtropical climates. Infections caused by C. violaceum are very uncommon, yet it can cause severe systemic infections with higher mortality when entered into the bloodstream through open wound. A case of symptomatic bacteremia in a woman caused by C. violaceum was identified recently at a tertiary care teaching hospital in Nepal. Timely diagnosis by microbiological methods and rapid administration of antimicrobials led to a successful treatment of this life-threatening infection in this case. From this experience, we suggest to include this bacterium in the differential diagnosis of sepsis, especially when abraded skin is exposed to soil or stagnant water in tropical areas. The precise antimicrobial selection and timely administration should be considered when this infection is suspected.
Leibson, Tom; Ben-Shimol, Shalom; Hazan, Guy; Fruchtman, Yariv; Kapelushnik, Joseph; Greenberg, David
Bacterial infections are a major threat to pediatric oncology patients with fever and neutropenia. Current management consists of empiric broad-spectrum antibiotics and prompt medical evaluation. Local bacterial susceptibility rates were published in 2005, and the local protocol (piperacillin and amikacin) was established as an adequate empiric treatment with -100% efficiency against the common pathogens in our pediatric hemato-oncology ward. To characterize the spectrum of bacteria isolated from blood cultures at the pediatric hemato-oncology ward between 2008- 2010, and to evaluate the current protocol. A prospective study, conducted in the pediatric hemato-oncologic ward among hospitalized children (2 months - 18 years) with fever and neutropenia. Blood cultures from peripheral blood and central lines were obtained from all patients at admission. Bacterial resistance to various antimicrobial agents was determined. During 2008-2010, 195 admissions (105 children) due to fever and neutropenia were recorded. Approximately 30% of all blood cultures were positive for a pathogen with -50% Gram positive bacteria mostly CONS. The most prevalent Gram negative bacteria were acinetobacter and klebsiella spp. Candida species were isolated from 7% of positive cultures. Susceptibility rates for the current empiric antimicrobial regimen were about 90%. CONS bacteremia rate increased from 4% in 2000-2002 to 29% in 2008-2010 (p < 0.01). The currently applied empiric antimicrobial protocol is an optimal first line regimen, considering the susceptibility of the most common pathogens. Judicious use of carbapenems for gram negative bacteria and glycopeptides or other novel antimicrobial agents in cases of CONS bacteremia is required.
Ruiz-Castillo, Ana; Lepe-Jiménez, José Antonio; Torres-Sánchez, María José; Artacho-Reinoso, María José; Aznar-Martín, Javier
To assess the relevance of correct identification and interpretation of susceptibility testing of Aeromonas spp. bacteremia isolates using newly developed molecular methods in comparison to previous conventional methods. The study included 22 patients with bacteremia due to Aeromonas hydrophila group, microbiologically characterized using the MicroScan system. Further identification to species level was performed by mass spectrometry, and confirmed by sequencing the rpoB gene. The MIC of imipenem, cefotaxime, piperacillin-tazobactam, ciprofloxacin and cotrimoxazole was studied using a commercial broth microdilution and antibiotic gradient strips with low and high inocula. Detection of carbapenemase production was performed using the modified Hodge test, and was confirmed by amplifying the cphA gene by PCR. A total of 9 (40.9%) isolates were identified as Aeromonas hydrophila, 8 (36.4%) as Aeromonas veronii, and the remaining 5 (22.7%) isolates as Aeromonas caviae. Resistance to beta-lactams according to both the commercial microdilution and MIC gradient strips methods was: 36%-50% to imipenem; 4%-56% to cefotaxime, and 27%-56% to piperacillin/tazobactam. The agreement between results generated by the automated system and the diffusion antibiotic gradient strip was, for all 3 species, 68% for imipenem, 50% to cefotaxime, and 46% to piperacillin/tazobactam. No resistance to cotrimoxazole and ciprofloxacin was found by either of the two methods, although 22.7% of the strains were resistant to nalidixic acid. It is essential to identify the isolates of Aeromonas spp. at the species level, due to the fact that beta-lactam resistance is species- and method-dependent. The high rate of resistance to beta-lactam and quinolones reduce their application as empiric treatments for invasive infection by Aeromonas ssp. Copyright © 2015 Elsevier España, S.L.U. y Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica. All rights reserved.
Yahav, Dafna; Schlesinger, Agata; Shaked, Hila; Goldberg, Elad; Paul, Mical; Bishara, Jihad; Leibovici, Leonard
The incidence of Staphylococcus aureus bacteremia (SAB) increases with advancing age with higher mortality reported in older adults. We aimed to describe the clinical presentation, management and outcomes of older patients with SAB. We analyzed data from a retrospectively collected database including 1692 patients with SAB, and compared 1158 older patients (≥65 years) with 534 younger patients (<65 years) in terms of clinical features, management of infection, and outcomes. Older patients were significantly less likely to be febrile on presentation, with 37.5 % (415/1106) of older patients presenting with normal body temperature [versus 29.2 % (152/520) of younger patients]. Older patients were however, more likely to have leukocytosis, septic shock, lower heart rate and lower diastolic blood pressure compared with younger patients. Management of older patients included significantly less imaging studies, performance of transesophageal echocardiogram (TEE) and infectious diseases consultation. TEE was performed less in older patients [124/726 (17.1 %) versus 72/285 (25.3 %)]. Mortality was significantly higher in older patients [550/1158 (47.5 %) versus 124/534 (23.2 %)], with predictors for mortality for the entire cohort in multivariate analysis including older age, higher Charlson comorbidity index, female sex, impaired functional capacity, pneumonia or primary bacteremia, and non-performance of TEE. Mortality rates in older patients with SAB are higher compared with younger patients. Several diagnostic and therapeutic procedures in the management of SAB were less likely to be performed in older patients in our cohort. These may have implications on outcome and should not be dismissed on the basis of age alone.
Tagarro, Alfredo; Bote, Patricia; Sánchez, Aida; Otheo, Enrique; Sanz, Juan-Carlos; Sanz-Rosa, David
In the Region of Madrid, universal immunization with the 13-serotypes pneumococcal conjugate vaccine (PCV13) started in May 2010. In July 2012, public funding ceased. Vaccination coverage decreased from >95% to 82% in 2013 and to 67% in 2014. Our aim was to investigate the impact of PCV13 withdrawal from Madrid Region universal immunization program on the incidence of complicated pneumococcal bacteremia. We performed a multicenter retrospective cohort study, from 2009 to 2014. Participants were children aged <14 years with Streptococcus pneumoniae bacteremia. Complications were defined as any condition requiring intensive care or surgery. Sequelae were conditions lasting ≥90 days. A total of 168 patients were recruited. One-fourth of both immunized and nonimmunized patients had complications. Global complications increased after PCV13 withdrawal. About 28% of PCV13 serotypes presented complications. Complications caused by PCV13 serotypes did not increase after July 2012. Non-PCV13 serotypes increased progressively from 2009 on, and 23% presented complications. A significant risk of complications was found for patients with meningitis, empyema, C-reactive protein >100 mg/L and serotype 1. A multivariate analysis indicated that complications were associated with meningitis and hospital admission after July 2012. Sequelae were significantly associated with children <2 years of age, meningitis and non-PCV13 serotypes. The incidence of complications caused by PCV13 serotypes did not increase 2 years after PCV13 withdrawal. Nevertheless, all-serotypes complications increased. The likely cause was that non-PCV13 serotypes (associated with meningitis) are on the rise.
Santolaya, María E; Farfán, Mauricio J; De La Maza, Verónica; Cociña, Manuela; Santelices, Felipe; Alvarez, Ana M; Avilés, Carmen L; Becker, Ana; O'Ryan, Miguel; Román, Paulina; Salgado, Carmen; Silva, Pamela; Topelberg, Santiago; Tordecilla, Juan; Varas, Mónica; Villarroel, Milena; Viviani, Tamara; Zubieta, Marcela; Torres, Juan P
Bacterial isolation using conventional microbiologic techniques rarely surpasses 25% in children with clinical and laboratory findings indicative of an invasive bacterial infection. The aim of this study was to determine the role of real-time polymerase chain reaction (RT-PCR) from whole blood samples compared with automated blood cultures (BC) in detection of relevant microorganisms causing bacteremia in episodes of high-risk febrile neutropenia (HRFN) in children with cancer. Children presenting with HRFN at 6 hospitals in Santiago, Chile, were invited to participate. Blood samples were obtained at admission for BC, and at admission and 24 hours for RT-PCR targeting DNA of Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa causing bacteremia in children with HRFN. A total of 177 HRFN episodes were evaluated from May 2009 to August 2010, of which 29 (16.3%) had positive BC, 9 (5%) positive for 1 of the 3 selected bacterial species: 5 for E. coli, 3 for S. aureus, and 1 for P. aeruginosa. RT-PCR detected 39 bacteria in 36 episodes (20%): 14 E. coli, 20 S. aureus, and 5 P. aeruginosa. The sensitivity, specificity, and positive and negative predictive values of RT-PCR compared with BC were 56%, 80%, 13%, and 97%. The final clinical diagnosis was compatible with an invasive bacterial infection in 30/36 (83%) RT-PCR-positive episodes. In our series, RT-PCR significantly improved detection of the most relevant bacteria associated with HRFN episodes. Large number of patients and close clinical monitoring, in addition to improved RT-PCR techniques will be required to fully recommend RT-PCR-based diagnosis for the routine workup of children with cancer, fever, and neutropenia.
Mora-Rillo, Marta; Fernández-Romero, Natalia; Francisco, Carolina Navarro-San; Díez-Sebastián, Jesús; Romero-Gómez, Maria Pilar; Fernández, Francisco Arnalich; López, Jose Ramon Arribas; Mingorance, Jesús
Extraintestinal pathogenic Escherichia coli (ExPEC) are a frequent cause of bacteremia and sepsis, but the role of ExPEC genetic virulence factors (VFs) in sepsis development and outcome is ill-defined. Prospective study including 120 adult patients with E. coli bacteremia to investigate the impact of bacterial and host factors on sepsis severity and mortality. Patients' clinical and demographic data were registered. Phylogenetic background of E. coli isolates was analyzed by SNP pyrosequencing and VFs by PCR. The E. coli isolates presented an epidemic population structure with 6 dominant clones making up to half of the isolates. VF gene profiles were highly diverse. Multivariate analysis for sepsis severity showed that the presence of cnf and blaTEM genes increased the risk of severe illness by 6.75 (95% confidence interval [CI] 1.79–24.71) and 2.59 (95% CI 1.04–6.43) times respectively, while each point in the Pitt score increased the risk by 1.34 (95% CI 1.02–1.76) times. Multivariate analysis for mortality showed that active chemotherapy (OR 17.87, 95% CI 3.35–95.45), McCabe-Jackson Index (OR for rapidly fatal category 120.15, 95% CI 4.19–3446.23), Pitt index (OR 1.78, 95% CI 1.25–2.56) and presence of fyuA gene (OR 8.05, 95% CI 1.37–47.12) were associated to increased mortality while the presence of P fimbriae genes had a protective role (OR 0.094, 95%IC 0.018–0.494). Bacteremic E. coli had a high diversity of genetic backgrounds and VF gene profiles. Bacterial VFs and host determinants had an impact on disease evolution and mortality. PMID:25654604
Jeon, Yongbum; Kim, Taek Soo; Kim, Hong Bin; Song, Junghan; Kim, Eui Chong
Robinsoniella peoriensis has recently been identified as a Gram-positive, spore-forming, anaerobic rod originally recovered from swine manure storage pits. To date, 6 cases of R. peoriensis infection have been reported, including 2 cases of bacteremia, 1 of abdominal fluid collection, and 3 of wound infection. In the present study, we report a 76-yr-old man with R. peoriensis bacteremia who developed aspiration pneumonia. Gram staining of a purified colony revealed Gram-positive, rod-shaped bacteria. Biochemical identification using API 20 A (bioMérieux, France) indicated presence of Clostridium spp. We performed both 500-bp and full-gene sequencing of 16S rRNA of the isolate. The sequence was analyzed with MicroSeq ID 16S rRNA Library v2.0 (Applied Biosystems, USA), GenBank Basic Local Alignment Search Tool (BLAST) (http://www.ncbi.nlm.nih.gov/genbank), and EzTaxon database v2.1 (http://www.eztaxon.org). The 500-bp 16S rRNA sequence of the blood culture isolate showed 99.16-99.79% similarity with R. peoriensis and the full-gene 16S rRNA sequence showed 98.87-99.50% similarity with R. peoriensis. The organism was confirmed as R. peoriensis by using all of the mentioned databases except for MicroSeq, which did not include the RNA sequence of this bacterium. This case suggests that identification of R. peoriensis might be challenging in clinical laboratories with no access to molecular methods, as certain commercial identification systems may not identify, or may misidentify, this organism. To the best of our knowledge, this is the first report of the isolation of R. peoriensis in Korea. PMID:22950075
Yang, Wei-Chiun; Chan, Oi-Wa; Wu, Tsu-Lan; Chen, Chyi-Liang; Su, Lin-Hui; Chiu, Cheng-Hsun
The majority of nontyphoid Salmonella infection is identified in children. When an invasive or severe Salmonella infection is encountered, ceftriaxone is recommended for such patients. A 2-year-old girl was hospitalized for the treatment of Salmonella bacteremia and discharged with standard ceftriaxone treatment. She was readmitted to the hospital after 2 days due to the recurrence of the Salmonella bacteremia. The study aimed to unveil the mechanism for the relapse. Six isolates (4 blood and 2 stool) were recovered from the patient, with the last two blood isolates being ceftriaxone-resistant. Pulsed-field gel electrophoresis was used for genotyping. Ceftriaxone resistance genes and transferability of the resistance plasmid were examined by molecular methods. All isolates were identified as Salmonella enterica serotype Oranienburg. Five isolates demonstrated almost identical electrophoresis patterns, except that in the two ceftriaxone-resistant isolates an extra band (>100 kb) was noted. A blaCMY-2 gene, carried by a 120-kb conjugative IncI1 plasmid of the sequence type 53, was identified in the two ceftriaxone-resistant isolates. Transfer of the resistance plasmid from one blood isolate to Escherichia coli J53 resulted in the increase of ceftriaxone minimum inhibitory concentration from 0.125 μg/mL to 32 μg/mL in the recipient. Ceftriaxone is the standard therapeutic choice for invasive or serious Salmonella infections in children. Pediatricians should be aware of the possibility of resistance development during therapy, especially in areas with a widespread of ceftriaxone resistance genes that are carried by a self-transferrable plasmid, such as the blaCMY-2-carrying IncI1 plasmid identified herein. Copyright © 2014. Published by Elsevier B.V.
Kim, Nak-Hyun; Kang, Yu Min; Han, Woong Dae; Park, Kyoung Un; Park, Kay-Hyun; Yoo, Jae Il; Lee, Dong-Gun; Park, Chulmin; Song, Kyoung-Ho; Kim, Eu Suk; Park, Sang Won; Kim, Nam Joong; Oh, Myoung-Don; Kim, Hong Bin
The small-colony variant (SCV) phenotype of Staphylococcus aureus is associated with intracellular persistence and reduced antimicrobial susceptibility, which can lead to therapeutic failure. Since SCVs grow slowly and have a confusing morphology, the identification of infections due to SCV is difficult. We have identified SCVs in two patients who presented with persistent methicillin-resistant Staphylococcus aureus (MRSA) bacteremia complicated by surgical site infections after cardiothoracic surgery. Nine blood isolates were collected from the two patients for species identification, antimicrobial susceptibility testing, and phenotypic and genotypic characterization. Colonies on Columbia blood agar were pinpoint, nonpigmented, nonhemolytic, and reverted to normal colonies after 48 hr of incubation on Schaedler agar. Auxotrophy assays revealed hemin dependence. Susceptibility to vancomycin (minimal inhibitory concentrations 1.0 μg/mL) was confirmed by E-test and broth microdilution test. All the isolates were identified as MRSA by multiplex polymerase chain reaction specific for the mecA, femA, and 16S rRNA genes, and all had the same genotype: Multilocus sequence typing ST5, SCCmec type II, agr type II, and spa type t2460. Moreover pulsed-field gel electrophoresis typing revealed that all nine isolates belonged to the same clone. Mutations in the relA gene were not found, and none of the isolates was identified as hVISA by population analysis profiling-AUC ratio. A high level of suspicion is required to detect SCVs, and although it is not common, the possibility of the SCV phenotype has to be considered in persistent S. aureus bacteremia.
Uslan, Daniel Z; Dowsley, Taylor F; Sohail, Muhammad R; Hayes, David L; Friedman, Paul A; Wilson, Walter R; Steckelberg, James M; Baddour, Larry M
Staphylococcus aureus bacteremia (SAB) in patients with cardiovascular implantable electronic devices (CIED), including permanent pacemakers (PPMs) and implantable cardioverter-defibrillators (ICD), can be the sole manifestation of device infection. To assess clinical factors associated with CIED infection, we retrospectively reviewed all patients with both CIED and SAB seen at Mayo Clinic Rochester between 2001 through 2006. CIED infection was defined using microbiological and clinical criteria. Of the 62 patients with SAB and a CIED, 22 patients (35.5%) had CIED infection. The generator pocket was identified as the source of bacteremia in seven (11%) patients. The majority of CIED infections were device-related infective endocarditis (12 of 22, 55%). Thirty percent of patients presenting with SAB greater than 1 year after device implantation had CIED infection; all but one had CIED-related infective endocarditis. Sixty percent of ICD patients (12 of 20) with SAB had CIED infection, compared with 24% of PPM patients (10 of 42, P = 0.01). On univariate analysis factors associated with CIED-related infective endocarditis included device type [odds ratio (OR) for ICD 13.3, 95% confidence interval [CI] 2.1, 84.9) and presence of a prosthetic heart valve (OR 6.8 95% CI 1.1, 43.4). CIED infection is common in patients with SAB. The presence of an ICD and prosthetic heart valve were associated with CIED-related infective endocarditis. Subsequent work should focus on prospectively characterizing the subset of patients with CIED infection who present with SAB as the sole manifestation of their device infection. (PACE 2010; 407-413).
Chahin, Abdullah; Zorzopulos, Jorge; Jobes, David V.; Migdady, Yazan; Yamamoto, Michelle; Parejo, Nicholas; Palardy, John E.; Horn, David L.
IMT504 is a novel immunomodulatory oligonucleotide that has shown immunotherapeutic properties in early preclinical and clinical studies. IMT504 was tested in a neutropenic rat model of Pseudomonas aeruginosa bacteremia and sepsis. This animal system recapitulates many of the pathological processes found in neutropenic patients with Gram-negative, bacterial infections. The research was conducted in the setting of an academic research laboratory. The test subjects were Sprague-Dawley rats. Animals were rendered neutropenic by administration of cyclophosphamide, colonized with P. aeruginosa by oral feeding, and then randomized to receive IMT504 over a range of doses and treatment regimens representing early and late therapeutic interventions. IMT504 immunotherapy conferred a significant survival advantage over the 12-day study period compared with the results seen with placebo-treated animals when the therapy was administered at the onset of neutropenia and even in the absence of antibiotics and after the onset of fever and systemic infection. Notably, even late salvage IMT504 monotherapy was highly effective (13/14 surviving rats with IMT504 therapy versus 2/14 controls, P = <0.001). Moreover, late salvage IMT504 monotherapy was as effective as antibiotic therapy (13/14 surviving rats versus 21/21 rats, P = 0.88). In addition, no antagonism or loss of therapeutic efficacy was noted with combination therapy of IMT504 plus antibiotics. IMT504 immunotherapy provides a remarkable survival advantage in bacteremia and sepsis in neutropenic animals and deserves further study as a new treatment option in patients with, or at risk for, severe Gram-negative bacterial infections and sepsis. PMID:25512413
Micozzi, Alessandra; Gentile, Giuseppe; Minotti, Clara; Cartoni, Claudio; Capria, Saveria; Ballarò, Daniele; Santilli, Stefania; Pacetti, Emanuele; Grammatico, Sara; Bucaneve, Giampaolo; Foà, Robin
Carbapenem-resistant Klebsiella pneumoniae (CRKP) spread and infections in patients with haematological malignancies are a serious concern especially in endemic areas. Treatment failures and delay in appropriate therapy for CRKP infections are frequent and the mortality rate associated with CRKP bacteremia in neutropenic haematological patients is reported about 60%. Haematological patients harboring CRKP hospitalized between February 2012 and May 2013 in an Italian Teaching hospital were examined. Conditions favouring CRKP spread in a haematological unit, risk factors for bacteremia in CRKP-carriers and for CRKP bacteremia-related death were evaluated in this observational retrospective study. CRKP was isolated in 22 patients, 14 (64%) had bacteremia. Control measures implementation, particularly the weekly rectal screening for CRKP performed in all hospitalized patients and contact precautions for CRKP-carriers and newly admitted patients until proved CRKP-negative, reduced significantly the CRKP spread (14 new carriers identified of 131 screened patients vs 5 of 242 after the intervention, p = 0.001). Fifty-eight percent of carriers developed CRKP bacteremia, and acute myeloid leukemia (AML) resulted independently associated with the bacteremia occurrence (p = 0.02). CRKP bacteremias developed mainly during neutropenia (86%) and in CRKP-carriers (79%). CRKP bacteremias were breakthrough in 10 cases (71%). Ten of 14 patient with CRKP bacteremias died (71%) and all had AML. The 70% of fatal bacteremias occurred in patients not yet recognized as CRKP-carriers and 80% were breakthrough. Initial adequate antibiotic therapy resulted the only independent factor able to protect against death (p = 0.02). The identification of CRKP-carriers is confirmed critical to prevent CRKP spread. AML patients colonized by CRKP resulted at high risk of CRKP-bacteremia and poor outcome and the adequacy of the initial antibiotic therapy may be effective to improve survival
Lee, Ching-Chi; Chu, Feng-Yuan; Ko, Wen-Chien; Chi, Chih-Hsien
The objective of this study is to analyze the differences in clinical presentation and outcome of community-onset bacteremia between human immunodeficiency virus (HIV)-infected adults and HIV-uninfected adults visiting the emergency department (ED). A multicenter, case-control study with a ratio of 1:4 was conducted retrospectively over an 8-year period. Demographic characteristics, severity of illness, and clinical outcomes determined from chart records were analyzed. In total, 74 HIV-infected adults (case patients) and 288 HIV-uninfected adults (control patients) were examined. Significant differences in clinical presentation, severity, and the source of bacteremia as well as bacteremia-causing microorganisms between the case patients and control patients were observed by univariate analyses. Using multivariate analyses, the following variables were positively associated with case patients: male sex (odds ratio [OR], 3.42; P = .01), bacteremia due to endocarditis (OR, 7.68; P = .007), bacteremia due to Salmonella enteritidis (OR, 4.29; P = .03), and comorbidity with chronic hepatitis (OR, 5.65; P < .001). Moreover, several independent risk factors of 28-day mortality were discovered, including inappropriate empirical antibiotic therapy after the ED visit (OR, 9.01; P < .001), an initial syndrome with septic shock (OR, 5.37; P < .001); a Pittsburgh bacteremia score greater than or equal to 4 points at the ED (OR, 4.28; P = .002), severe underlying disease based on McCabe classification (rapid and ultimately fatal; OR, 3.31; P = .002), and bacteremia due to pneumonia (OR, 2.66; P = .03). Of note, HIV infection was not a significant factor affecting 28-day mortality. This study demonstrated that the clinical characteristics, the severity, and the character of bacteremia in HIV-infected and uninfected patients varied among community-onset bacteremic patients visiting the ED, despite the limited impact of HIV infection on short-term outcomes. Copyright © 2014
Moon, Troy D.; Silva, Wilson P.; Buene, Manuel; Morais, Luís; Valverde, Emilio; Vermund, Sten H.; Brentlinger, Paula E.
Fever is typically treated empirically in rural Mozambique. We examined the distribution and antimicrobial susceptibility patterns of bacterial pathogens isolated from blood-culture specimens, and clinical characteristics of ambulatory HIV-infected febrile patients with and without bacteremia. This analysis was nested within a larger prospective observational study to evaluate the performance of new Mozambican guidelines for fever and anemia in HIV-infected adults (clinical trial registration NCT01681914, www.clinicaltrials.gov); the guidelines were designed to be used by non-physician clinicians who attended ambulatory HIV-infected patients in very resource-constrained peripheral health units. In 2012 (April-September), we recruited 258 HIV-infected adults with documented fever or history of recent fever in three sites within Zambézia Province, Mozambique. Although febrile patients were routinely tested for malaria, blood culture capacity was unavailable in Zambézia prior to study initiation. We confirmed bacteremia in 39 (15.1%) of 258 patients. The predominant organisms were non-typhoid Salmonella, nearly all resistant to multiple first-line antibiotics (ampicillin, chloramphenicol, and trimethoprim-sulfamethoxazole). Features most associated with bacteremia included higher temperature, lower CD4+ T-lymphocyte count, lower hemoglobin, and headache. Introduction of blood cultures allowed us to: 1) confirm bacteremia in a substantial proportion of patients; 2) tailor specific antimicrobial therapy for confirmed bacteremia based on known susceptibilities; 3) make informed choices of presumptive antibiotics for patients with suspected bacteremia; and 4) construct a preliminary clinical profile to help clinicians determine who would most likely benefit from presumptive bacteremia treatment. Our findings demonstrate that in resource-limited settings, there is urgent need to expand local microbiologic capacity to better identify and treat cases of bacteremia in HIV
To estimate the incremental cost of nosocomial bacteremia according to the causative focus and classified by the antibiotic sensitivity of the microorganism.Patients admitted to Hospital del Mar in Barcelona from 2005 to 2012 were included. We analyzed the total hospital costs of patients with nosocomial bacteremia caused by microorganisms with a high prevalence and, often, with multidrug-resistance. A control group was defined by selecting patients without bacteremia in the same diagnosis-related group.Our hospital has a cost accounting system (full-costing) that uses activity-based criteria to estimate per-patient costs. A logistic regression was fitted to estimate the probability of developing bacteremia (propensity score) and was used for propensity-score matching adjustment. This propensity score was included in an econometric model to adjust the incremental cost of patients with bacteremia with differentiation of the causative focus and antibiotic sensitivity.The mean incremental cost was estimated at &OV0556;15,526. The lowest incremental cost corresponded to bacteremia caused by multidrug-sensitive urinary infection (&OV0556;6786) and the highest to primary or unknown sources of bacteremia caused by multidrug-resistant microorganisms (&OV0556;29,186).This is one of the first analyses to include all episodes of bacteremia produced during hospital stays in a single study. The study included accurate information about the focus and antibiotic sensitivity of the causative organism and actual hospital costs. It provides information that could be useful to improve, establish, and prioritize prevention strategies for nosocomial infections.
Moon, Troy D; Silva, Wilson P; Buene, Manuel; Morais, Luís; Valverde, Emilio; Vermund, Sten H; Brentlinger, Paula E
Fever is typically treated empirically in rural Mozambique. We examined the distribution and antimicrobial susceptibility patterns of bacterial pathogens isolated from blood-culture specimens, and clinical characteristics of ambulatory HIV-infected febrile patients with and without bacteremia. This analysis was nested within a larger prospective observational study to evaluate the performance of new Mozambican guidelines for fever and anemia in HIV-infected adults (clinical trial registration NCT01681914, www.clinicaltrials.gov); the guidelines were designed to be used by non-physician clinicians who attended ambulatory HIV-infected patients in very resource-constrained peripheral health units. In 2012 (April-September), we recruited 258 HIV-infected adults with documented fever or history of recent fever in three sites within Zambézia Province, Mozambique. Although febrile patients were routinely tested for malaria, blood culture capacity was unavailable in Zambézia prior to study initiation. We confirmed bacteremia in 39 (15.1%) of 258 patients. The predominant organisms were non-typhoid Salmonella, nearly all resistant to multiple first-line antibiotics (ampicillin, chloramphenicol, and trimethoprim-sulfamethoxazole). Features most associated with bacteremia included higher temperature, lower CD4+ T-lymphocyte count, lower hemoglobin, and headache. Introduction of blood cultures allowed us to: 1) confirm bacteremia in a substantial proportion of patients; 2) tailor specific antimicrobial therapy for confirmed bacteremia based on known susceptibilities; 3) make informed choices of presumptive antibiotics for patients with suspected bacteremia; and 4) construct a preliminary clinical profile to help clinicians determine who would most likely benefit from presumptive bacteremia treatment. Our findings demonstrate that in resource-limited settings, there is urgent need to expand local microbiologic capacity to better identify and treat cases of bacteremia in HIV
Kullar, Ravina; Davis, Susan L; Kaye, Keith S; Levine, Donald P; Pogue, Jason M; Rybak, Michael J
To evaluate a clinical pathway using daptomycin in patients with bacteremia caused by methicillin-resistant Staphylococcus aureus (MRSA) isolates exhibiting vancomycin minimum inhibitory concentrations (MICs) greater than 1 mg/L. Two-phase quasi-experimental study. Level I trauma center in Detroit, Michigan. The study population consisted of a total of 170 patients with MRSA bacteremia susceptible to vancomycin: 70 patients who had initial blood MRSA isolates exhibiting a vancomycin MIC > 1 mg/L and were treated with vancomycin were included in phase I (retrospective baseline period [2005-2007]) and 100 patients who were switched to daptomycin after initial vancomycin therapy according to the institutional MRSA bacteremia treatment pathway were included in phase II (the period after implementation of the treatment pathway [2008-2010]). The MRSA bacteremia treatment pathway was as follows: vancomycin therapy was initiated, optimizing target trough concentrations to 15-20 mg/L; for isolates demonstrating vancomycin MICs greater than 1 mg/L, therapy was switched to daptomycin, initiated at dosages of 6 mg/kg/day or higher. Infection characteristics, patient outcomes, and costs were evaluated. Patient characteristics were similar between the phase I and phase II groups. Phase II patients were more likely to achieve clinical success than were phase I patients (75.0% vs 41.4%, p<0.001). Phase II patients demonstrated a shorter total hospital length of stay and shorter durations of inpatient therapy, fever, and bacteremia. Treatment during phase I was independently associated with failure. Nine patients during phase I experienced nephrotoxicity, and two patients during phase II experienced increases in creatine kinase level. Costs were similar between phases I and II ($18,385 vs $19,755, p>0.05), although the hospital readmission rate was higher in phase I (33% vs 21%, p=0.08). Among the patients with bacteremia who had MRSA isolates that exhibited elevated
Shenoy, Erica S.; Huang, Mingshu; Kuhlen, James L.; Ware, Winston A.; Parker, Robert A.; Walensky, Rochelle P.
Background Methicillin-sensitive Staphylococcus aureus (MSSA) bacteremia is a morbid infection with mortality benefit from receipt of parenteral β-lactam therapy. A substantial portion of MSSA bacteremia patients report penicillin allergy, but infrequently have true allergy. Objective To determine the frequency and predictors of optimal and adequate therapy in patients with MSSA bacteremia. Design Retrospective cohort. Participants Adult inpatients with MSSA bacteremia, January 2009 through October 2013. Main Measures The primary measure was a trial of optimal therapy (OT), defined as ≥3 inpatient days or discharge on any first-line agents (nafcillin, oxacillin, cefazolin, or penicillin G, if susceptible). The secondary measure was completion of adequate therapy (AT), defined as ≥10 inpatient days or discharge on an agent appropriate for MSSA bacteremia. Data were electronically gathered with key variables manually validated through chart review. Log-binomial regression models were used to determine the frequency and predictors of outcomes. Key Results Of 456 patients, 346 (76%) received a trial of OT. Patients reporting penicillin allergy (13%) were less likely to receive OT trial than those without penicillin allergy (47% vs. 80%, p <0.001). Adjusting for other factors, penicillin allergy was the largest negative predictor of OT trial (RR 0.64 [0.49, 0.83]). Infectious Disease (ID) consultation was the largest positive predictor of OT trial across all patients (RR 1.34 [1.14, 1.57]). Allergy/Immunology consultation was the single most important predictor of OT trial among patients reporting penicillin allergy (RR 2.33 [1.44, 3.77]). Of 440 patients, 391 (89%) completed AT, with ID consultation the largest positive predictor of the outcome (RR 1.28 [1.15, 1.43]). Conclusions Nearly 25% of patients with MSSA bacteremia did not receive OT trial and about 10% did not receive AT completion. Reported penicillin allergy reduced, and ID consult increased, the
Third generation cephalosporin resistant Enterobacteriaceae and multidrug resistant gram-negative bacteria causing bacteremia in febrile neutropenia adult cancer patients in Lebanon, broad spectrum antibiotics use as a major risk factor, and correlation with poor prognosis.
Moghnieh, Rima; Estaitieh, Nour; Mugharbil, Anas; Jisr, Tamima; Abdallah, Dania I; Ziade, Fouad; Sinno, Loubna; Ibrahim, Ahmad
Bacteremia remains a major cause of life-threatening complications in patients receiving anticancer chemotherapy. The spectrum and susceptibility profiles of causative microorganisms differ with time and place. Data from Lebanon are scarce. We aim at evaluating the epidemiology of bacteremia in cancer patients in a university hospital in Lebanon, emphasizing antibiotic resistance and risk factors of multi-drug resistant organism (MDRO)-associated bacteremia. This is a retrospective study of 75 episodes of bacteremia occurring in febrile neutropenic patients admitted to the hematology-oncology unit at Makassed General Hospital, Lebanon, from October 2009-January 2012. It corresponds to epidemiological data on bacteremia episodes in febrile neutropenic cancer patients including antimicrobial resistance and identification of risk factors associated with third generation cephalosporin resistance (3GCR) and MDRO-associated bacteremia. Out of 75 bacteremias, 42.7% were gram-positive (GP), and 57.3% were gram-negative (GN). GP bacteremias were mostly due to methicillin-resistant coagulase negative staphylococci (28% of total bacteremias and 66% of GP bacteremias). Among the GN bacteremias, Escherichia coli (22.7% of total, 39.5% of GN organisms) and Klebsiella pneumoniae(13.3% of total, 23.3% of GN organisms) were the most important causative agents. GN bacteremia due to 3GC sensitive (3GCS) bacteria represented 28% of total bacteremias, while 29% were due to 3GCR bacteria and 9% were due to carbapenem-resistant organisms. There was a significant correlation between bacteremia with MDRO and subsequent intubation, sepsis and mortality. Among potential risk factors, only broad spectrum antibiotic intake >4 days before bacteremia was found to be statistically significant for acquisition of 3GCR bacteria. Using carbapenems or piperacillin/tazobactam>4 days before bacteremia was significantly associated with the emergence of MDRO (p < 0.05). Our findings have major
Caballero-Granado, F J; Cisneros, J M; Luque, R; Torres-Tortosa, M; Gamboa, F; Díez, F; Villanueva, J L; Pérez-Cano, R; Pasquau, J; Merino, D; Menchero, A; Mora, D; López-Ruz, M A; Vergara, A
A prospective, multicenter study was carried out over a period of 10 months. All patients with clinically significant bacteremia caused by Enterococcus spp. were included. The epidemiological, microbiological, clinical, and prognostic features and the relationship of these features to the presence of high-level resistance to gentamicin (HLRG) were studied. Ninety-three patients with enterococcal bacteremia were included, and 31 of these cases were caused by HLRG (33%). The multivariate analysis selected chronic renal failure, intensive care unit stay, previous use of antimicrobial agents, and Enterococcus faecalis species as the independent risk factors that influenced the development of HLRG. The strains with HLRG showed lower levels of susceptibility to penicillin and ciprofloxacin. Clinical features (except for chronic renal failure) were similar in both groups of patients. HLRG did not influence the prognosis for patients with enterococcal bacteremia in terms of either the crude mortality rate (29% for patients with bacteremia caused by enterococci with HLRG and 28% for patients not infected with strains with HLRG) or the hospital stay after the acquisition of enterococcal bacteremia. Hemodynamic compromise, inappropriate antimicrobial therapy, and mechanical ventilation were revealed in the multivariate analysis to be the independent risk factors for mortality. Prolonged hospitalization was associated with the nosocomial acquisition of bacteremia and polymicrobial infections.
Discontinuation of Systematic Surveillance and Contact Precautions for Vancomycin-Resistant Enterococcus (VRE) and Its Impact on the Incidence of VRE faecium Bacteremia in Patients with Hematologic Malignancies.
Almyroudis, Nikolaos G; Osawa, Ryosuke; Samonis, George; Wetzler, M; Wang, Eunice S; McCarthy, Philip L; Segal, Brahm H
OBJECTIVE To study the effect of discontinuation of systematic surveillance for vancomycin-resistant Enterococcus (VRE) and contact isolation of colonized patients on the incidence of VRE bacteremia SETTING A hematology-oncology unit with high prevalence of VRE colonization characterized by predominantly sporadic molecular epidemiology PARTICIPANTS Inpatients with hematologic malignancies and recipients of hematopoietic stem cell transplantation METHODS The incidence of VRE bacteremia was measured prospectively during 2 different 3-year time periods; the first during active VRE surveillance and contact precautions and the second after discontinuation of these policies. We assessed the collateral impact of this policy change on the incidence of bacteremia due to methicillin-resistant Staphylococcus aureus (MRSA) and Clostridium difficile infection even though we maintained contact precautions for these organisms. Incidence of infectious events was measured as number of events per 1,000 patients days per month. Time series analysis was used to evaluate trends. RESULTS The incidence of VRE bacteremia remained stable after discontinuation of VRE surveillance and contact precautions. The incidence of MRSA bacteremia and Clostridium difficile infection for which we continued contact precautions also remained stable. Aggregated antibiotic utilization and nursing hours per patient days were similar between the 2 study periods. CONCLUSION Active surveillance and contact precautions for VRE colonization did not appear to prevent VRE bacteremia in patients with hematologic malignancies and recipients of hematopoietic stem cell transplantation with high prevalence of VRE characterized by predominantly sporadic molecular epidemiology.
Kreisel, Kristen M.; Stine, O. Colin; Johnson, J. Kristie; Perencevich, Eli N.; Shardell, Michelle D.; Lesse, Alan J.; Gordin, Fred M.; Climo, Michael W.; Roghmann, Mary-Claire
Objective USA300 methicillin-resistant Staphylococcus aureus (MRSA) is increasing as a cause of severe community-associated bacteremic infections. We assessed severe sepsis in response to infection in patients with USA300 MRSA compared to non-USA300 MRSA bacteremia. Methods A cohort study was conducted from 1997–2008 comparing sepsis in response to infection in 271 patients with MRSA bacteremia from four VA hospitals. Results Sixty-seven (25%) patients with MRSA bacteremia were USA300 MRSA; 204 (75%) were non-USA300 MRSA. The proportion of MRSA bacteremia caused by USA300 MRSA increased over time (χ2 p<0.0001). Adjusting for age and nosocomial infection, patients with USA300 MRSA bacteremia were more likely to have severe sepsis or septic shock in response to infection than patients with non-USA300 MRSA bacteremia (adjusted Relative Risk=1.82; 95% CI: 1.16–2.87; p=0.01). Conclusions This suggests that patients with USA300 MRSA are more likely to develop severe sepsis in response to their infection, which could be due to host or bacterial differences. PMID:21558047
du Moulin, G C; Lynch, S E; Hedley-Whyte, J; Broitman, S A
A spectrophotometric Limulus amebocyte lysate assay using lysis filtration and centrifugation has been developed for the detection of gram-negative bacteria in blood. The assay is directed at detection of endotoxin in viable and nonviable bacteria present in the blood-stream and not detection of free endotoxin in plasma. The assay was evaluated in a model of peritonitis in which rats were challenged with an inoculum consisting of sterilized human feces, barium sulfate, and one of eight species of bacteria. This assay was able to detect gram-negative bacteremia due to Escherichia coli, Pseudomonas aeruginosa, Serratia marcescens, Proteus mirabilis, and Klebsiella pneumoniae in the rat model when compared with sham-inoculated uninfected rats. The assay failed to detect bacteremia due to Bacteroides fragilis or Staphylococcus aureus, nor was there a significant rise in absorbance when a pellet containing sterilized feces was implanted in the rat.
Sherid, Muhammed; Samo, Salih; Sulaiman, Samian; Husein, Husein; Sifuentes, Humberto; Sridhar, Subbaramiah
Lactobacilli are non-spore forming, lactic acid producing, gram-positive rods. They are a part of the normal gastrointestinal and genitourinary microbiota and have rarely been reported to be the cause of infections. Lactobacilli species are considered non-pathogenic organisms and have been used as probiotics to prevent antibiotic associated diarrhea. There are sporadic reported cases of infections related to lactobacilli containing probiotics. In this paper we discuss a case of an 82 year old female with liver abscess and bacteremia from lactobacillus after using probiotics containing lactobacilli in the course of her treatment of Clostridium difficile colitis. The Lactobacillus strain identification was not performed and therefore, both commensal microbiota and the probiotic product should be considered as possible sources of the strain. Lactobacilli can lead to bacteremia and liver abscesses in some susceptible persons and greater awareness of this potential side effect is warranted with the increasing use of probiotics containing lactobacilli.
Altuntas, Fevzi; Yildiz, Orhan; Eser, Bülent; Gündogan, Kürsat; Sumerkan, Bulent; Çetin, Mustafa
Background Micrococcus species may cause intracranial abscesses, meningitis, pneumonia, and septic arthritis in immunosuppressed or immunocompetent hosts. In addition, strains identified as Micrococcus spp. have been reported recently in infections associated with indwelling intravenous lines, continuous ambulatory peritoneal dialysis fluids, ventricular shunts and prosthetic valves. Case presentation We report on the first case of a catheter-related bacteremia caused by Kocuria rosea, a gram-positive microorganism belonging to the family Micrococcaceae, in a 39-year-old man undergoing peripheral blood stem cell transplantation due to relapsed Hodgkin disease. This uncommon pathogen may cause opportunistic infections in immunocompromised patients. Conclusions This report presents a case of Kocuria rosea catheter related bacteremia after stem cell transplantation successfully treated with vancomycin and by catheter removal. PMID:15615593
Brady, Adam C; Lewis, James S; Pfeiffer, Christopher D
Rapid molecular techniques to identify resistant pathogens are revolutionizing antibiotic stewardship; however, it is important to recognize the limitations of these techniques. Herein we describe two cases of bacteremia that were both initially identified by genotypic testing as carbapenem-resistant Acinetobacter spp. and subsequently identified phenotypically as carbapenem-susceptible A. radioresistens. The genotypic results prompted unnecessary broad-spectrum antibiotic use and infection control concerns.
Li, Julius; Echevarria, Kelly L; Hughes, Darrel W; Cadena, Jose A; Bowling, Jason E; Lewis, James S
Contrary to prior case reports that described occasional clinical failures with cefazolin for methicillin-susceptible Staphylococcus aureus (MSSA) infections, recent studies have demonstrated no difference in outcomes between cefazolin and antistaphylococcal penicillins for the treatment of MSSA bacteremia. While promising, these studies described low frequencies of high-inoculum infections, such as endocarditis. This retrospective study compares clinical outcomes of cefazolin versus oxacillin for complicated MSSA bacteremia at two tertiary care hospitals between January 2008 and June 2012. Fifty-nine patients treated with cefazolin and 34 patients treated with oxacillin were included. Osteoarticular (41%) and endovascular (20%) sources were the predominant sites of infection. The rates of clinical cure at the end of therapy were similar between cefazolin and oxacillin (95% versus 88%; P=0.25), but overall failure at 90 days was higher in the oxacillin arm (47% versus 24%; P=0.04). Failures were more likely to have received surgical interventions (63% versus 40%; P=0.05) and to have an osteoarticular source (57% versus 33%; P=0.04). Failures also had a longer duration of bacteremia (7 versus 3 days; P=0.0002), which was the only predictor of failure. Antibiotic selection was not predictive of failure. Rates of adverse drug events were higher in the oxacillin arm (30% versus 3%; P=0.0006), and oxacillin was more frequently discontinued due to adverse drug events (21% versus 3%; P=0.01). Cefazolin appears similar to oxacillin for the treatment of complicated MSSA bacteremia but with significantly improved safety. The higher rates of failure with oxacillin may have been confounded by other patient factors and warrant further investigation. Copyright © 2014, American Society for Microbiology. All Rights Reserved.
Echevarria, Kelly L.; Hughes, Darrel W.; Cadena, Jose A.; Bowling, Jason E.; Lewis, James S.
Contrary to prior case reports that described occasional clinical failures with cefazolin for methicillin-susceptible Staphylococcus aureus (MSSA) infections, recent studies have demonstrated no difference in outcomes between cefazolin and antistaphylococcal penicillins for the treatment of MSSA bacteremia. While promising, these studies described low frequencies of high-inoculum infections, such as endocarditis. This retrospective study compares clinical outcomes of cefazolin versus oxacillin for complicated MSSA bacteremia at two tertiary care hospitals between January 2008 and June 2012. Fifty-nine patients treated with cefazolin and 34 patients treated with oxacillin were included. Osteoarticular (41%) and endovascular (20%) sources were the predominant sites of infection. The rates of clinical cure at the end of therapy were similar between cefazolin and oxacillin (95% versus 88%; P = 0.25), but overall failure at 90 days was higher in the oxacillin arm (47% versus 24%; P = 0.04). Failures were more likely to have received surgical interventions (63% versus 40%; P = 0.05) and to have an osteoarticular source (57% versus 33%; P = 0.04). Failures also had a longer duration of bacteremia (7 versus 3 days; P = 0.0002), which was the only predictor of failure. Antibiotic selection was not predictive of failure. Rates of adverse drug events were higher in the oxacillin arm (30% versus 3%; P = 0.0006), and oxacillin was more frequently discontinued due to adverse drug events (21% versus 3%; P = 0.01). Cefazolin appears similar to oxacillin for the treatment of complicated MSSA bacteremia but with significantly improved safety. The higher rates of failure with oxacillin may have been confounded by other patient factors and warrant further investigation. PMID:24936596
Munita, Jose M.; Mishra, Nagendra N.; Alvarez, Danya; Tran, Truc T.; Diaz, Lorena; Panesso, Diana; Reyes, Jinnethe; Murray, Barbara E.; Adachi, Javier A.; Bayer, Arnold S.; Arias, Cesar A.
High-dose daptomycin (DAP) therapy failed in a neutropenic patient with bloodstream infection caused by a DAP-susceptible Enterococcus faecium (minimum inhibitory concentration, 3 µg/mL) harboring genetic changes associated with DAP resistance, with persistent bacteremia and selection of additional resistances. Daptomycin monotherapy should be used cautiously against DAP-susceptible E. faecium strains with minimum inhibitory concentrations >2 µg/mL. PMID:25107294
Dilworth, Thomas J.; Ibrahim, Omar; Hall, Pamela; Sliwinski, Jora; Walraven, Carla
Vancomycin (VAN) is often used to treat methicillin-resistant Staphylococcus aureus (MRSA) bacteremia despite a high incidence of microbiological failure. Recent in vitro analyses of β-lactams in combination with VAN demonstrated synergistic activity against MRSA. The goal of this study was to examine the impact of combination therapy with VAN and a β-lactam (Combo) on the microbiological eradication of MRSA bacteremia compared to VAN alone. This was a retrospective cohort study of patients with MRSA bacteremia who received Combo therapy or VAN alone. Microbiological eradication of MRSA, defined as a negative blood culture obtained after initiation of therapy, was used to evaluate the efficacy of each regimen. A total of 80 patients were included: 50 patients in the Combo group and 30 patients in the VAN-alone group. Microbiological eradication was achieved in 48 patients (96%) in the Combo group compared to 24 patients (80%) in the VAN-alone group (P = 0.021). In a multivariable model, the Combo treatment had a higher likelihood of achieving microbiological eradication (adjusted odds ratio, 11.24; 95% confidence interval, 1.7 to 144.3; P = 0.01). In patients with infective endocarditis (n = 22), 11/11 (100%) who received Combo therapy achieved microbiological eradication compared to 9/11 (81.8%) treated with VAN alone, but the difference was not statistically significant (P = 0.20). Patients with MRSA bacteremia who received Combo therapy were more likely to experience microbiological eradication of MRSA than patients who received VAN alone. PMID:24145519
de Lalla, F; Maserati, R; Scarpellini, P; Marone, P; Nicolin, R; Caccamo, F; Rigoli, R
A combination of clarithromycin, ciprofloxacin, and amikacin for the treatment of Mycobacterium avium-Mycobacterium intracellulare bacteremia was evaluated in 12 AIDS patients. Mycobacteremia cleared in all patients by 2 to 8 weeks of treatment, and symptoms resolved. Four patients died; all had negative blood cultures until death, and disseminated M. avium-M. intracellulare complex infection was not considered the primary cause of death. PMID:1387303
Tsai, Chia-Ta; Chi, Chih-Yu; Ho, Cheng-Mao; Lin, Po-Chang; Chou, Chia-Hui; Wang, Jen-Hsien; Wang, Jui-Hsing; Lin, Hsiao-Chuan; Tien, Ni; Lin, Kuo-Hsi; Ho, Mao-Wang; Lu, Jang-Jih
Streptococcus dysgalactiae subsp. equisimilis (SDSE) is increasingly recognized as a human pathogen responsible for invasive infection and streptococcal toxic shock syndrome (STSS). The pathogen possesses virulence genes that resemble those found in Streptococcus pyogenes (GAS). We analyzed the association between these specific toxic genes, clinical presentations, and outcome in patients with SDSE infections. Patients (older than 18 years) with community-acquired invasive bacteremia caused by SDSE bacteremia who were undergoing treatment at China Medical University Hospital from June 2007 to December 2010 were included in this study. Multiplex polymerase chain reaction was performed to identify virulence genes of the SDSE isolates. Demographic data, clinical presentations, and outcome in patients with SDSE infections were reviewed and analyzed. Forty patients with 41 episodes of SDSE bacteremia were reviewed. The median age of the patients with SDSE infection was 69.7 years; 55% were female and 78% had underlying diseases. Malignancy (13, 33%) and diabetes mellitus (13, 33%) were the most common comorbidities. The 30-day mortality rate was 12%. Compared with the survivors, the non-survivors had a higher rate of diabetes mellitus (80% vs. 26%), liver cirrhosis (60% vs.11%), shock (60% vs.17%), STSS (60% vs. 8%), and a high Pittsburgh bacteremia score >4 (40% vs. 6%). Most isolates had scpA, ska, saga, and slo genes, whereas speC, speG, speH, speI, speK, smez, and ssa genes were not detected. speA gene was identified only in one patient with STSS (1/6, 17%). All isolates were susceptible to penicillin, cefotaxime, levofloxacin, moxifloxacin, vancomycin, and linezolid. In invasive SDSE infections, most isolates carry putative virulence genes, such as scpA, ska, saga, and slo. Clinical SDSE isolates in Taiwan remain susceptible to penicillin cefotaxime, and levofloxacin. Copyright © 2013. Published by Elsevier B.V.
Dilworth, Thomas J; Ibrahim, Omar; Hall, Pamela; Sliwinski, Jora; Walraven, Carla; Mercier, Renée-Claude
Vancomycin (VAN) is often used to treat methicillin-resistant Staphylococcus aureus (MRSA) bacteremia despite a high incidence of microbiological failure. Recent in vitro analyses of β-lactams in combination with VAN demonstrated synergistic activity against MRSA. The goal of this study was to examine the impact of combination therapy with VAN and a β-lactam (Combo) on the microbiological eradication of MRSA bacteremia compared to VAN alone. This was a retrospective cohort study of patients with MRSA bacteremia who received Combo therapy or VAN alone. Microbiological eradication of MRSA, defined as a negative blood culture obtained after initiation of therapy, was used to evaluate the efficacy of each regimen. A total of 80 patients were included: 50 patients in the Combo group and 30 patients in the VAN-alone group. Microbiological eradication was achieved in 48 patients (96%) in the Combo group compared to 24 patients (80%) in the VAN-alone group (P = 0.021). In a multivariable model, the Combo treatment had a higher likelihood of achieving microbiological eradication (adjusted odds ratio, 11.24; 95% confidence interval, 1.7 to 144.3; P = 0.01). In patients with infective endocarditis (n = 22), 11/11 (100%) who received Combo therapy achieved microbiological eradication compared to 9/11 (81.8%) treated with VAN alone, but the difference was not statistically significant (P = 0.20). Patients with MRSA bacteremia who received Combo therapy were more likely to experience microbiological eradication of MRSA than patients who received VAN alone.
Cia, Cong-Tat; Li, Ming-Ji; Li, Chia-Wen; Lee, Nan-Yao; Chang, Shen-Shin; Lee, Ching-Chi; Ko, Wen-Chien
Bloodstream infection is not uncommon in kidney transplant recipients (KTRs) and is associated with mortality, graft loss, and increased medical expenses. Whether these septic patients are more vulnerable to serious complications, resistant strains, or worse clinical outcomes than other patient groups in the community-onset settings remains undetermined. A retrospective study was conducted at a medical center in southern Taiwan. Community-onset bacteremia in the KTRs and a control population at the emergency department were identified. Demographic data, clinical characteristics, bacteremic pathogens, antimicrobial resistance, and clinical outcomes were recorded. Forty-one bacteremic episodes in the KTRs and 82 episodes in control patients were studied. The KTR group had younger age, fewer malignancies, more urosepsis (61% vs. 22%, p = 0.004), and fewer biliary tract infections (0% vs. 13.4%, p = 0.018). Escherichia coli was the most commonly isolated pathogen in both the groups (51.2% and 41.5%, respectively). No Klebsiella pneumoniae bacteremia was noted in the KTRs, compared with 14 (17.1%) episodes in the control group (p = 0.010). Antimicrobial resistance profiles of bacteremic pathogens were similar (all p > 0.6). The KTRs with community-onset bacteremia did not have a worse outcome (in-hospital mortality rate: 2.4% vs. 10%, p = 0.172) nor more incomplete resolution of kidney injury after acute kidney injury events (21.1% vs. 25%, p > 0.99) than the control group. KTRs with community-onset bacteremia did not fare worse in terms of clinical outcome and kidney injury. Copyright © 2014. Published by Elsevier B.V.
van Nieuwkoop, Cees; Bonten, Tobias N; Wout, Jan W Van't; Becker, Martin J; Groeneveld, Geert H; Jansen, Casper L; van der Vorm, Eric R; Ijzerman, Ed P; Rothbarth, Philip H; Termeer-Veringa, Etel M; Kuijper, Ed J; van Dissel, Jaap T
In a prospective study involving 642 patients with febrile urinary tract infection (UTI), we found antimicrobial pretreatment (odds ratio [OR], 3.3), an indwelling urinary catheter (OR, 2.8), and malignancy (OR, 2.7) to be independent risk factors for bacteremia with a uropathogen that was not cultured or recognized in the urine. Although the diagnostic value of blood cultures has been questioned in UTI, we advocate performing blood cultures for patients with these risk factors.
Togneri, A; Lopardo, H; Corso, A
A case of bacteremia due to high-level-vancomycin- (MIC = 64 micrograms/ml) and high-level-teicoplanin- (MIC = 32 micrograms/ml) resistant Enterococcus gallinarum is described. Both genes, van C1 and van A, respectively conferring natural low-level resistance and acquired high-level resistance to vancomycin, were found in the enterococcal genoma. The present is the first report of an E. gallinarum isolate showing the van A genotype in Argentina.
Miedema, Karin G E; Winter, Rik H L J; Ammann, Roland A; Droz, Sara; Spanjaard, Lodewijk; de Bont, Eveline S J M; Kamps, Willem A; van de Wetering, Marianne D; Tissing, Wim J E
Infections are a major cause of morbidity and mortality in pediatric cancer patients. The aim of this study was to establish the microbiological spectrum and the susceptibility patterns of bacteremia-causing bacteria in pediatric cancer patients with febrile neutropenia in relation to the use of prophylactic and empirical antibiotics. We analyzed positive blood cultures of pediatric cancer patients presenting with febrile neutropenia between 2004 and 2011 in Groningen and Amsterdam (the Netherlands) and in Bern (Switzerland), using different antibiotic prophylactic and empirical regimens. A total of 156 patients with 202 bacteremias, due to 248 bacteria species, were enrolled. The majority (73%) of bacteremias were caused by Gram-positive bacteria. Gram-negative bacteria, especially Pseudomonas aeruginosa, were observed significantly more often in Bern, where no fluoroquinolone prophylaxis was used. Ciprofloxacin-resistant bacteria were cultured more often from patients who did receive ciprofloxacin prophylaxis, compared to the patients who did not (57 versus 11%, p = 0.044). Gram-positive bacteria predominated in this study. We showed that the use of prophylactic antibiotics in pediatric cancer patients was associated with increased resistance rates, which needs further study. The strategy for empiric antimicrobial therapy for febrile neutropenia should be adapted to local antibiotic resistance patterns.
Castillo, Juan S; Leal, Aura L; Cortes, Jorge A; Alvarez, Carlos A; Sanchez, Ricardo; Buitrago, Giancarlo; Barrero, Liliana I; Gonzalez, Andrés L; Henriquez, Daibeth H
To evaluate risk factors associated with methicillin-resistant Staphylococcus aureus (MRSA) bacteremia emergence, its prognosis, and mortality-determining factors in critically ill patients in Colombia. A multicenter, retrospective cohort study conducted in 2005-2008 at 16 public and private reference health care institutions in Bogotá, Colombia, that form part of a national epidemiological surveillance network and a hospital network with 4 469 beds. Methicillin-resistant emergence and mortality were analyzed using descriptive and time-to-event analysis; a multivariate Cox proportional hazard regression model was built to test the association between methicillin resistance and mortality. A total of 372 patients were studied: 186 with MRSA bacteremia, randomly matched with 186 with methicillin-susceptible Staphylococcus aureus (MSSA) bacteremia. Previous surgery, antibiotic exposure, and hospital-acquired infections were independently associated with methicillin resistance. MRSA caused longer hospital stays among survivors (median 24 versus 18 days, P = 0.014). Mortality predictors were: patient age, creatinine level over 1.21 mg/dl at ICU admission, severe sepsis, and inotropic requirement. Appropriate antimicrobial therapy and antimicrobial therapy change were independent protective factors, as was male gender. Methicillin resistance per se was not a mortality-independent prognostic factor. Previous conditions, such as age, baseline renal impairment, severe sepsis, and inotropy demand explained the observed mortality. Appropriate antimicrobial therapy remained a protective factor. A call to improve infection control measures in Colombia is mandatory.
Ratzinger, Franz; Dedeyan, Michel; Rammerstorfer, Matthias; Perkmann, Thomas; Burgmann, Heinz; Makristathis, Athanasios; Dorffner, Georg; Loetsch, Felix; Blacky, Alexander; Ramharter, Michael
Adequate early empiric antibiotic therapy is pivotal for the outcome of patients with bloodstream infections. In clinical practice the use of surrogate laboratory parameters is frequently proposed to predict underlying bacterial pathogens; however there is no clear evidence for this assumption. In this study, we investigated the discriminatory capacity of predictive models consisting of routinely available laboratory parameters to predict the presence of Gram-positive or Gram-negative bacteremia. Major machine learning algorithms were screened for their capacity to maximize the area under the receiver operating characteristic curve (ROC-AUC) for discriminating between Gram-positive and Gram-negative cases. Data from 23,765 patients with clinically suspected bacteremia were screened and 1,180 bacteremic patients were included in the study. A relative predominance of Gram-negative bacteremia (54.0%), which was more pronounced in females (59.1%), was observed. The final model achieved 0.675 ROC-AUC resulting in 44.57% sensitivity and 79.75% specificity. Various parameters presented a significant difference between both genders. In gender-specific models, the discriminatory potency was slightly improved. The results of this study do not support the use of surrogate laboratory parameters for predicting classes of causative pathogens. In this patient cohort, gender-specific differences in various laboratory parameters were observed, indicating differences in the host response between genders.
Clermont, Olivier; Glodt, Jérémy; Burdet, Charles; Pognard, Dominique; Lefort, Agnès; Branger, Catherine; Denamur, Erick
The portal of entry of Escherichia coli bacteremia, a frequent and severe disease, is most commonly the urinary tract followed by the digestive tract. Recent reports have evidenced the presence of several distinct E. coli clones within a single patient suffering of extra-intestinal infection. To explore the relationships between the blood and portal of entry strains, we thoroughly studied 98 bacteremic patients from the French prospective COLIBAFI cohort. In these patients, we compared genotypically and phenotypically E. coli strains isolated from the blood and the suspected portal of entry [non-urinary pus (n=52) and urine (n=52)]. We found genetically distinct strains exhibiting distinct antibiotypes in the blood and pus samples (8 patients; 15%) and the blood and urine samples (2 patients; 3.8%) (p=0.09). These data highlight the complexity of pathophysiology of E. coli bacteremia and should be taken into consideration when strain antibiotic susceptibility is tested, especially in bacteremia of pus origin. Copyright © 2013 Elsevier GmbH. All rights reserved.
Kamboj, Mini; Chung, Dick; Seo, Susan K; Pamer, Eric G; Sepkowitz, Kent A; Jakubowski, Ann A; Papanicolaou, Genovefa
The impact of the rising prevalence of vancomycin-resistant Enterococcus (VRE) prior to hematopoietic stem cell transplantation (HSCT) and changes in transplant techniques on risk of VREB (VRE bacteremia) early after HSCT is not known. This is a retrospective study of 247 adult patients who underwent allogeneic HSCT in the years 2008 and 2009 at the Memorial Sloan-Kettering Cancer Center. Sixty-eight of 247 (27.5%) patients were VRE colonized on pretransplant screening. VRE was the leading cause of bacteremia in the first 30 days after HSCT; 23 of 43 (53.5%) patients with positive blood cultures had VRE. Only 13 (57%) of the 23 patients with early VREB were colonized with VRE on pre-HSCT screening cultures. Mortality was directly attributable to VRE infection in 9% of patients with early VREB. VRE is emerging as the most common cause of preengraftment bacteremia in patients undergoing allogeneic HSCT, and is associated with substantial mortality. Pre-HSCT screening for VRE with stool cultures will not identify all patients who are at risk for VREB. The use of alternate agents with activity against Gram-positive bacteria for fever and neutropenia early after HSCT should be evaluated further in prospective studies. Copyright © 2010 American Society for Blood and Marrow Transplantation. Published by Elsevier Inc. All rights reserved.
Kamboj, Mini; Chung, Dick; Seo, Susan K.; Pamer, Eric G.; Sepkowitz, Kent A.; Jakubowski, Ann A.; Papanicolaou, Genovefa
The impact of the rising prevalence of vancomycin-resistant Enterococcus (VRE) prior to hematopoietic stem cell transplantation (HSCT) and changes in transplant techniques on risk of VREB (VRE bacteremia) early after HSCT is not known. This is a retrospective study of 247 adult patients who underwent allogeneic HSCT in the years 2008 and 2009 at the Memorial Sloan-Kettering Cancer Center. Sixty-eight of 247 (27.5%) patients were VRE colonized on pretransplant screening. VRE was the leading cause of bacteremia in the first 30 days after HSCT; 23 of 43 (53.5%) patients with positive blood cultures had VRE. Only 13 (57%) of the 23 patients with early VREB were colonized with VRE on pre-HSCT screening cultures. Mortality was directly attributable to VRE infection in 9% of patients with early VREB. VRE is emerging as the most common cause of preengraftment bacteremia in patients undergoing allogeneic HSCT, and is associated with substantial mortality. Pre-HSCT screening for VRE with stool cultures will not identify all patients who are at risk for VREB. The use of alternate agents with activity against Gram-positive bacteria for fever and neutropenia early after HSCT should be evaluated further in prospective studies. PMID:20685257
Castroagudín, J F; Lorenzo Solar, M; Martínez Rey, C; Brage Varela, A; Torre, J A; González Quintela, A
The association of Streptococcus bovis bacteremia and endocarditis with colonic pathology, mainly neoplastic, is well known. Its relationship with liver disease without evidence of gastrointestinal disease has been rarely described. To analyze the association between S. bovis infection and liver disease, positive blood cultures for this microorganism in hospitalized patients in the Internal Medicine and Gastroenterology Departments from December 1993 until October 1995, have been reviewed. Three cases of S. bovis infection (one bacteremia, two endocarditis) were found. Alcoholic liver disease was diagnosed in all three patients, with associated hepatitis C virus in one of them. Colonic pathology was excluded by colonoscopy and/or barium enema. Other gastrointestinal disorders were excluded by means of gastroscopy, barium gastrointestinal study and abdominal ultrasonography. Antibiotic therapy was based in betalactamics, with associated aminoglycoside in two cases. One patient needed aortic and mitral valve replacement and another one needed orthotopic liver transplantation. No new gastrointestinal pathology emerged in the follow-up (5-23 months). Cases of S. bovis bacteremia and endocarditis should be screened not also for colonic pathology, but also for liver disease, particularly in alcoholics.
Darmstadt, Gary L.; Saha, Samir K.; Choi, Yoonjoung; El Arifeen, Shams; Ahmed, Nawshad Uddin; Bari, Sanwarul; Rahman, Syed M.; Mannan, Ishtiaq; Crook, Derrick; Fatima, Kaniz; Winch, Peter J.; Seraji, Habibur Rahman; Begum, Nazma; Rahman, Radwanur; Islam, Maksuda; Rahman, Anisur; Black, Robert E.; Santosham, Mathuram; Sacks, Emma; Baqui, Abdullah H.
Background To devise treatment strategies for neonatal infections, the population-level incidence and antibiotic susceptibility of pathogens must be defined. Methods Surveillance for suspected neonatal sepsis was conducted in Mirzapur, Bangladesh, from February 2004 through November 2006. Community health workers assessed neonates on postnatal days 0, 2, 5, and 8 and referred sick neonates to a hospital, where blood was collected for culture from neonates with suspected sepsis. We estimated the incidence and pattern of community-acquired neonatal bacteremia and determined the antibiotic susceptibility profile of pathogens. Results The incidence rate of community-acquired neonatal bacteremia was 3.0 per 1000 person–neonatal periods. Among the 30 pathogens identified, the most common was Staphylococcus aureus (n = 10); half of all isolates were gram positive. Nine were resistant to ampicillin and gentamicin or to ceftiaxone, and 13 were resistant to cotrimoxazole. Conclusion S. aureus was the most common pathogen to cause community-acquired neonatal bacteremia. Nearly 40% of infections were identified on days 0–3, emphasizing the need to address maternal and environmental sources of infection. The combination of parenteral procaine benzyl penicillin and an aminoglycoside is recommended for the first-line treatment of serious community-acquired neonatal infections in rural Bangladesh, which has a moderate level of neonatal mortality. Additional population-based data are needed to further guide national and global strategies. Trial registration ClinicalTrials.gov identifier: NCT00198627. PMID:19671016
Fanci, R; Paci, C; Anichini, P; Pecile, P; Marra, G; Casini, C; Nicoletti, P
The incidence and molecular epidemiology of P. aeruginosa bacteremias, were monitored in patients with acute leukemia to define mechanisms of possible nosocomial transmission. From September 1997 to March 2001 febrile episodes were examined and blood isolates of P. aeruginosa were studied employing Pulsed-Field gel Electrophoresis (PFGE). Evaluation of DNA correlation was performed according to Tenover criteria. A total of 309 febrile episodes occurred in 187 patients. Of 139 organisms isolated in 116 bacteremias, 48% were gram negative bacilli (GNB); P. aeruginosa bacteremias were recorded in 34 (51%) of GNB sepsis. Evaluation of DNA correlation showed 2 related in 1997, 7 related in 1998, 10 related in 1999, 6 related in 2000-2001 (mainly closely and possibly related); therefore isolates closely related among themselves were also possibly related with other strains. About 60% of patients with related strains were hospitalized in the same room or in different rooms but became infected in the same period. Our data suggest a horizontal spread among the patients even if other sources were possible. The study assessed the usefulness of PFGE in bacteriological epidemiology.
Barrero, Liliana I; Castillo, Juan S; Leal, Aura L; Sánchez, Ricardo; Cortés, Jorge A; Alvarez, Carlos A; González, Andrés L
Resistant infections, especially those involving the bloodstream, are associated with a greater use of resources. Their estimates are variable and depend on the methodology used. Staphylococcus aureus is the main pathogen isolated in blood in our hospitals. There is no consolidated data about economic implications of methicillin-resistant S. aureus infection. To describe the cost of care of methicillin-resistant S. aureus bacteremia in a reference population from nine hospitals in Bogotá. Materials y methods: A multicenter cohort study included 204 patients in a 1:1 ratio according to resistance. Direct medical costs were calculated from hospitalization bills, while the bacteremia period was calculated by applying microcosting based on standard fares. We found no significant differences between groups in demographic and clinical characteristics, except for resistance risk factors. Fifty-three percent of patients died during hospitalization. Hospital stay and total invoiced value during hospitalization were significantly higher in the group with methicillin-resistant S. aureus bacteremia. For this group, higher costs in ICU stay, antibiotics use, intravenous fluids, laboratory tests and respiratory support were recorded. A crude increase of 31% and an adjusted increase of 70% in care costs associated with methicillin resistance were registered. Our study supports decision makers in finding and funding infection prevention programs, especially those infections caused by resistant organisms.
Wenzler, Eric; Wang, Fei; Goff, Debra A; Prier, Beth; Mellett, John; Mangino, Julie E; Bauer, Karri A
Infectious diseases (ID) consultation and antimicrobial stewardship intervention have been shown to improve the management of Staphylococcus aureus bacteremia (SAB). As the workload of antimicrobial stewardship programs (ASPs) continues to increase, ASPs must find a way to maximize the efficiency of the program while optimizing patient outcomes. The objective of this study was to evaluate the impact of incorporating health informatics into the management of SAB via a pharmacist-driven initiative. Retrospective, single-center quasi-experimental study of hospitalized patients with SAB. During the intervention period, pharmacists were alerted to patients with SAB via a patient scoring tool integrated into the electronic medical record. Pharmacists utilized the scoring tool and the institution's evidence-based practice guideline to make standardized recommendations to promote adherence to SAB quality-of-care measures and encourage ID consultation. The primary outcome was overall compliance along with adherence to individual quality-of-care components. Secondary clinical outcomes were also analyzed. 84 patients were identified for study inclusion, 45 in the pre-intervention and 39 in the intervention group. As a whole, all four quality-of-care components for the management of SAB were significantly more frequently adhered to in the intervention group (68.9% vs. 92.3%; P=0.008). The incidence of ID consult improved significantly by almost 20% in the intervention group (75.6% vs. 94.9%, P=0.015). No statistically significant differences in duration of bacteremia, length-of-stay, infection-related length-of-stay, or readmission were observed between the groups. The incidence of all-cause mortality was 6-fold higher in the pre-intervention group compared to the intervention group (15.6% vs. 2.6%, P=0.063). An automated, pharmacist-driven intervention for the management of patients with SAB demonstrated a significant improvement in patients receiving an ID consult, targeted
Cheng, Ming-Wei; Lee, Chun-Ming; Wang, Nai-Yu; Wu, Alice Y; Lin, Chih-Chen; Weng, Li-Chuan; Liu, Chang-Pan; Shih, Shou-Chuan
The purpose of this study is to describe clinical characteristics of Salmonella bacteremia in adult patients and analyze ciprofloxacin-nonsusceptible isolates. A total of 101 Salmonella blood isolates from adult patients were collected from January 2011 to December 2013 in MacKay Memorial Hospital. Eight ciprofloxacin-nonsusceptible Salmonella blood isolates were screened for carbapenemase and other β lactamase genes. Isolates were examined by PCR for the quinolone resistance-determining region (QRDR) of all subunits for DNA gyrase (gyrA and gyrB) genes and topoisomerase IV (parC and parE) genes. There were 22 (21.78%) S. enterica serovar B, 5 (4.95%) S. enterica serovar C1, 7 (6.93%) S. enterica serovar C2, 65 (64.36%) S. enterica serovar D, and 2 (1.98%) S. enterica serovar Typhi (S. typhi) isolates. β-lactamase gene screening and sequencing yielded only one blaCMY-2-positive isolate. In multivariate risk factor analysis, renal insufficiency [odds ratio (OR) 3.774; p = 0.020] and heart disease (OR 2.922; p = 0.027) were more common among elderly patients (≥65 years). Independent risk factors for ciprofloxacin-nonsusceptible strains included S. enterica serovar C2 (OR 28.430; p = 0.032), renal insufficiency (OR 13.927; p = 0.032), and immunosuppression agent usage (OR 60.082; p = 0.006). 87.50% (7/8) of isolates had gyrA mutation, 62.50% (5/8) had parC mutation, and none had gyrB and parE mutations. Isolates with both Ser83Phe/Asp87Asn gyrA and Thr57Ser/Ser80Ile parC mutation genes were highly ciprofloxacin-resistant (minimum inhibitory concentration ≥4 mg/L). Elderly patients with renal insufficiency and heart disease were at risk for Salmonella bacteremia. Those for ciprofloxacin-nonsusceptible strains included S. enterica serovar C2, renal insufficiency, and immunosuppression agent usage. The 8 ciprofloxacin-nonsusceptible isolates carried gyrA and parC mutations, which cause resistance that poses a major concern. Copyright © 2015. Published
Uyanik, Muhammet Hamidullah; Yazgi, Halil; Ozden, Kemalettin; Erdil, Zeynep; Ayyildiz, Ahmet
Objective: The aim of this study is to determine the species distribution, slime activity, and methicillin resistance of coagulase-negative staphylococci (CoNS) isolated from blood cultures as either contaminants or true bacteremia agents. Materials and Methods: In this study, 13.268 blood culture samples sent to our laboratory from various clinics during a two-year period were examined in terms of the presence of CoNS to clarify whether the isolates are true bacteremia agents, as defined by Centers for Disease Control and Prevention (CDC) criteria. The slime activities of true bacteremia agents (58 CoNS strains) and contaminants (50 randomly selected CoNS strains) were investigated by the Christensen method. The methicillin susceptibilities of the strains were determined by the disk diffusion method. Results: Although the frequency of slime production was 39.7% among the true bacteremia CoNS agents, it was 18% in CoNS that were judged to be contaminants (p<0.05). S. epidermidis was the most frequently isolated species for both the true bacteremia agent group (56.9%) and contaminant group (74%). Additionally, S. epidermidis was the bacterium most frequently characterized as slime producing in both groups. The methicillin resistance of slime-producing CoNS was determined to be 82.6% for the true bacteremia agent group and 77.8% for the contaminant group. Conclusion: The presence of slime activity in CoNS isolated from blood culture samples is supportive evidence that they are most likely the agents of true bacteremia cases. PMID:25610309
Uyanik, Muhammet Hamidullah; Yazgi, Halil; Ozden, Kemalettin; Erdil, Zeynep; Ayyildiz, Ahmet
The aim of this study is to determine the species distribution, slime activity, and methicillin resistance of coagulase-negative staphylococci (CoNS) isolated from blood cultures as either contaminants or true bacteremia agents. In this study, 13.268 blood culture samples sent to our laboratory from various clinics during a two-year period were examined in terms of the presence of CoNS to clarify whether the isolates are true bacteremia agents, as defined by Centers for Disease Control and Prevention (CDC) criteria. The slime activities of true bacteremia agents (58 CoNS strains) and contaminants (50 randomly selected CoNS strains) were investigated by the Christensen method. The methicillin susceptibilities of the strains were determined by the disk diffusion method. Although the frequency of slime production was 39.7% among the true bacteremia CoNS agents, it was 18% in CoNS that were judged to be contaminants (p<0.05). S. epidermidis was the most frequently isolated species for both the true bacteremia agent group (56.9%) and contaminant group (74%). Additionally, S. epidermidis was the bacterium most frequently characterized as slime producing in both groups. The methicillin resistance of slime-producing CoNS was determined to be 82.6% for the true bacteremia agent group and 77.8% for the contaminant group. The presence of slime activity in CoNS isolated from blood culture samples is supportive evidence that they are most likely the agents of true bacteremia cases.
Hamada, Yohei; Magarifuchi, Hiroki; Oho, Megumi; Kusaba, Koji; Nagasawa, Zenzo; Fukuoka, Mami; Yamakuchi, Hiroki; Urakami, Toshiharu; Aoki, Yosuke
Enterococcus consists human bowel flora, but sometimes behave as an important nosocomial pathogen. In order to identify clinical characteristics that help discriminate between ampicillin-susceptible and ampicillin-resistant enterococcal bacteremia in advance for antimicrobial susceptibility testing, a retrospective eight-year study was carried out in patients with enterococcal bacteremia experienced in Saga University Hospital, Japan. A total of 143 patients were included in the analysis: 85 (59.4%) with bacteremia caused by ampicillin-susceptible enterococci and 58 (40.6%) by ampicillin-resistant strains. Hospital-acquired bacteremia was present in 79.0% (113/143) of patients. Abdominal infections, urinary tract infections, and unknown source were predominant foci for the two groups. Patients with ampicillin-resistant enterococcal bacteremia was significantly associated with hematological cancer, immunosuppressive therapy, prior use of antibiotics, and mucositis associated with febrile neutropenia. The 28-day mortality was significantly higher in ampicillin-resistant enterococcal bacteremia. On multivariate analysis, independent risk factors for ampicillin-resistant enterococci were as follows: prior exposures to penicillins and carbapenems, and bacteremia related to mucositis with febrile neutropenia. These findings would assist physicians in deciding whether glycopeptide antibiotics should be included as an empiric antibiotic therapy in patients with suspected enterococcal infections and also those with persistent neutropenic fever refractory to fourth generation cephalosporin. A few cases of MALDI-TOF MS-identified Enterococcus faecium that turned out ampicillin-sensitive were also described to emphasize the importance of taking epidemiological aspects of patients into considerations when deciding initial antimicrobial treatment. Copyright © 2015 Japanese Society of Chemotherapy and The Japanese Association for Infectious Diseases. Published by Elsevier Ltd
Amodio-Groton, Maria; Rashid, Mohamad; Lamp, Kenneth C.; Hoffman-Roberts, Holly L.; Sakoulas, George; Yoon, Min J.; Schweitzer, Suzanne; Rastogi, Anjay
Patients with underlying renal disease may be vulnerable to vancomycin-mediated nephrotoxicity and Staphylococcus aureus bacteremia treatment failure. In light of recent data demonstrating the successful use of β-lactam plus daptomycin in very difficult cases of S. aureus bacteremia, we examined safety and clinical outcomes for patients who received daptomycin with or without concomitant β-lactams. We identified 106 patients who received daptomycin for S. aureus bacteremia, had mild or moderate renal insufficiency according to FDA criteria, and enrolled in the Cubicin Outcomes Registry and Experience (CORE), a multicenter registry, from 2005 to 2009. Daptomycin treatment success was 81%. Overall treatment efficacy was slightly enhanced with the addition of a β-lactam (87% versus 78%; P = 0.336), but this trend was most pronounced for bacteremia associated with endocarditis or bone/joint infection or bacteremia from an unknown source (90% versus 57%; P = 0.061). Factors associated with reduced daptomycin efficacy (by logistic regression) were an unknown source of bacteremia (odds ratio [OR] = 7.59; 95% confidence interval [CI] = 1.55 to 37.2), moderate renal impairment (OR = 9.11; 95% CI = 1.46 to 56.8), and prior vancomycin failure (OR = 11.2; 95% CI = 1.95 to 64.5). Two patients experienced an increase in creatine phosphokinase (CPK) that resolved after stopping daptomycin. No patients developed worsening renal insufficiency related to daptomycin. In conclusion, daptomycin appeared to be effective and well tolerated in patients with S. aureus bacteremia and mild to moderate renal insufficiency. Daptomycin treatment efficacy might be enhanced with β-lactam combination therapy in primary endovascular and bone/joint infections. Additional studies will be necessary to confirm these findings. PMID:23254428
Endo, Shiro; Yano, Hisakazu; Kanamori, Hajime; Inomata, Shinya; Aoyagi, Tetsuji; Hatta, Masumitsu; Gu, Yoshiaki; Tokuda, Koichi; Kitagawa, Miho; Kaku, Mitsuo
Acinetobacter baumannii is generally the most frequently isolated Acinetobacter species. Sequence analysis techniques allow reliable identification of Acinetobacter isolates at the species level. Forty-eight clinical isolates of Acinetobacter spp. were obtained from blood cultures at Tohoku University Hospital. These isolates were identified at the species level by partial sequencing of the RNA polymerase β-subunit (rpoB), 16S rRNA, and gyrB genes. Then further characterization was done by using the PCR for detection of OXA-type β-lactamase gene clusters, metallo-β-lactamases, and carO genes. Pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing were also performed. The most frequent isolate was Acinetobacter soli (27.1%). Six of the 13 A. soli isolates were carbapenem nonsusceptible, and all of these isolates produced IMP-1. PFGE revealed that the 13 A. soli isolates were divided into 8 clusters. This study demonstrated that A. soli accounted for a high proportion of Acinetobacter isolates causing bacteremia at a Japanese tertiary hospital. Non-A. baumannii species were identified more frequently than A. baumannii and carbapenem-nonsusceptible isolates were found among the non-A. baumannii strains. These results emphasize the importance of performing epidemiological investigations of Acinetobacter species.
Pixley, R. A.; DeLa Cadena, R. A.; Page, J. D.; Kaufman, N.; Wyshock, E. G.; Colman, R. W.; Chang, A.; Taylor, F. B.
The hypotension in septicemia is believed to be mediated by the combined action of many mediators including cytokines, prostaglandins, and complement components. To evaluate the contribution of the contact/kinin-forming system to hypotension, the authors used an established experimental baboon model of bacteremia in which two concentrations of Escherichia Coli (E. coli) were used to produce lethal and nonlethal hypotension. The lethal group (n = 5) developed irreversible hypotension that significantly correlated with the decline in levels of high molecular weight kininogen (HK) and an increase in alpha 2 macroglobulin-kallikrein complexes (alpha 2M-kal). The nonlethal group (n = 9) experienced reversible hypotension, a less striking decline in HK, and only slight elevation in alpha 2M-kal. No significant changes were found in levels of factor XII, prekallikrein, and factor XI in either group. A significant change in the contact system, which reflects the fatal outcome, is the rise in alpha 2M-kal. This study suggests that irreversible hypotension correlates with prolonged activation of the contact system. PMID:1373271
Cornick, Jennifer E.; Chaguza, Chrispin; Yalcin, Feyruz; Harris, Simon R.; Gray, Katherine J.; Kiran, Anmol M.; Molyneux, Elizabeth; French, Neil; Faragher, Brian E.; Everett, Dean B.; Bentley, Stephen D.
Streptococcus pneumoniae is a nasopharyngeal commensal that occasionally invades normally sterile sites to cause bloodstream infection and meningitis. Although the pneumococcal population structure and evolutionary genetics are well defined, it is not clear whether pneumococci that cause meningitis are genetically distinct from those that do not. Here, we used whole-genome sequencing of 140 isolates of S. pneumoniae recovered from bloodstream infection (n = 70) and meningitis (n = 70) to compare their genetic contents. By fitting a double-exponential decaying-function model, we show that these isolates share a core of 1,427 genes (95% confidence interval [CI], 1,425 to 1,435 genes) and that there is no difference in the core genome or accessory gene content from these disease manifestations. Gene presence/absence alone therefore does not explain the virulence behavior of pneumococci that reach the meninges. Our analysis, however, supports the requirement of a range of previously described virulence factors and vaccine candidates for both meningitis- and bacteremia-causing pneumococci. This high-resolution view suggests that, despite considerable competency for genetic exchange, all pneumococci are under considerable pressure to retain key components advantageous for colonization and transmission and that these components are essential for access to and survival in sterile sites. PMID:26259813
Chen, Chang-Hung; Lee, Chao-Tai; Chang, Tsung-Chain
We describe an immunocompromised patient with Tsukamurella tyrosinosolvens bacteremia and coinfection of Mycobacterium bovis pneumonia. A 75-year-old male was admitted to our hospital complaining of persistent fever with general malaise. His medical history showed that he had diabetes mellitus (HbA1C 9.2%). A chest computed tomography (CT) showed left upper lung consolidation . Two sets of blood culture at admission finally showed Tsukamurella tyrosinosolvens. Moreover, three transbronchoscopy washing specimen cultures revealed Mycobacterium bovis. The organism Tsukamurella tyrosinosolvens was identified using conventional biochemical identification methods, PCR-restriction DNA fragment analysis, and 16S rRNA gene sequencing. The clinical mycobacterial isolates were identified to the species level by combining Polymerase Chain Reaction (PCR) with an oligonucleotide microarray to detect the M. bovis amplicons. According to our literature review, our patient's case was the first of a coinfection with Tsukamurella tyrosinosolvens and Mycobacterium bovis. Prolonged antibiotic treatment and underlying disease control are necessary for this type of patient.
Martinod, Kimberly; Fuchs, Tobias A.; Zitomersky, Naamah L.; Wong, Siu Ling; Demers, Melanie; Gallant, Maureen; Wang, Yanming
Neutrophil extracellular traps (NETs), consisting of nuclear DNA with histones and microbicidal proteins, are expelled from activated neutrophils during sepsis. NETs were shown to trap microbes, but they also fuel cardiovascular, thrombotic, and autoimmune disease. The role of NETs in sepsis, particularly the balance between their antimicrobial and cytotoxic actions, remains unclear. Neutrophils from peptidylarginine deiminase 4-(PAD4−/−) deficient mice, which lack the enzyme allowing for chromatin decondensation and NET formation, were evaluated. We found that neutrophil functions involved in bacterial killing, other than NETosis, remained intact. Therefore, we hypothesized that prevention of NET formation might not have devastating consequences in sepsis. To test this, we subjected the PAD4−/− mice to mild and severe polymicrobial sepsis produced by cecal ligation and puncture. Surprisingly, under septic conditions, PAD4−/− mice did not fare worse than wild-type mice and had comparable survival. In the presence of antibiotics, PAD4-deficiency resulted in slightly accelerated mortality but bacteremia was unaffected. PAD4−/− mice were partially protected from lipopolysaccharide-induced shock, suggesting that PAD4/NETs may contribute to the toxic inflammatory and procoagulant host response to endotoxin. We propose that preventing NET formation by PAD4 inhibition in inflammatory or thrombotic diseases is not likely to increase host vulnerability to bacterial infections. PMID:25624317
Wildi, K; Tschudin-Sutter, S; Dell-Kuster, S; Frei, R; Bucher, H C; Nüesch, R
Blood cultures are routinely taken in outpatients with fever and suspected bacterial infections. However, in the majority of cases, they are not informative and of limited value for clinical decision making. The aim of this study was therefore to investigate factors associated with positive blood cultures in outpatients presenting to an outpatient clinic and emergency room. This was a case-control study of all outpatients with positive blood cultures from January 1, 2006 to October 31, 2007 and matched control patients with negative blood cultures in the same time period. Microbiology results and medical charts were reviewed to determine factors associated with positive blood cultures. The presence of a systemic inflammation response syndrome (SIRS) (OR 2.7, 95% Cl 1.0-7.2) and increased C-reactive protein (CRP) (OR 1.1 per 10 mg/l, 95% Cl 1.0-1.2) were the most powerful predictive values for the development of positive blood cultures. In positive cases serum albumin was lower (35 mg/l versus 39 mg/l) than in controls. SIRS, increasing CRP and low albumin were associated with positive blood cultures in outpatients. With simple clinical assessment and few laboratory tests indicative of infection, it is possible to define a group at higher risk for bacteremia in outpatients.
Martinod, Kimberly; Fuchs, Tobias A; Zitomersky, Naamah L; Wong, Siu Ling; Demers, Melanie; Gallant, Maureen; Wang, Yanming; Wagner, Denisa D
Neutrophil extracellular traps (NETs), consisting of nuclear DNA with histones and microbicidal proteins, are expelled from activated neutrophils during sepsis. NETs were shown to trap microbes, but they also fuel cardiovascular, thrombotic, and autoimmune disease. The role of NETs in sepsis, particularly the balance between their antimicrobial and cytotoxic actions, remains unclear. Neutrophils from peptidylarginine deiminase 4-(PAD4(-/-)) deficient mice, which lack the enzyme allowing for chromatin decondensation and NET formation, were evaluated. We found that neutrophil functions involved in bacterial killing, other than NETosis, remained intact. Therefore, we hypothesized that prevention of NET formation might not have devastating consequences in sepsis. To test this, we subjected the PAD4(-/-) mice to mild and severe polymicrobial sepsis produced by cecal ligation and puncture. Surprisingly, under septic conditions, PAD4(-/-) mice did not fare worse than wild-type mice and had comparable survival. In the presence of antibiotics, PAD4-deficiency resulted in slightly accelerated mortality but bacteremia was unaffected. PAD4(-/-) mice were partially protected from lipopolysaccharide-induced shock, suggesting that PAD4/NETs may contribute to the toxic inflammatory and procoagulant host response to endotoxin. We propose that preventing NET formation by PAD4 inhibition in inflammatory or thrombotic diseases is not likely to increase host vulnerability to bacterial infections.
Achouiti, Ahmed; de Vos, Alex F; de Beer, Regina; Florquin, Sandrine; van 't Veer, Cornelis; van der Poll, Tom
Streptococcus pneumoniae is one of the most common causes of sepsis. Sepsis is associated with the release of 'damage-associated molecular patterns' (DAMPs). The receptor for advanced glycation end products (RAGE) is a multiligand receptor, abundantly expressed in the lungs, that recognizes several of these DAMPs. Triggering of RAGE leads to activation of the NF-κB pathway and perpetuation of inflammation. Earlier investigations have shown that the absence of RAGE reduces inflammation and bacterial dissemination and increases survival in sepsis caused by S. pneumoniae pneumonia. We hypothesized that the detrimental role of RAGE depends on the level of RAGE expression in the primary organ of infection. By directly injecting S. pneumoniae intravenously, thereby circumventing the extensive RAGE-expressing lung, we here determined whether RAGE contributes to an adverse outcome of bacteremia or whether its role is restricted to primary lung infection. During late-stage infection (48 h), rage(-/-) mice had an attenuated systemic inflammatory response, as reflected by lower plasma levels of proinflammatory cytokines, reduced endothelial cell activation (as measured by E-selectin levels) and less neutrophil accumulation in lung tissue. However, RAGE deficiency did not influence bacterial loads or survival in this model. In accordance, plasma markers for cell injury were similar in both mouse strains. These results demonstrate that while RAGE plays a harmful part in S. pneumoniae sepsis originating from the respiratory tract, this receptor has a limited role in the outcome of primary bloodstream infection by this pathogen.
Kulohoma, Benard W; Cornick, Jennifer E; Chaguza, Chrispin; Yalcin, Feyruz; Harris, Simon R; Gray, Katherine J; Kiran, Anmol M; Molyneux, Elizabeth; French, Neil; Parkhill, Julian; Faragher, Brian E; Everett, Dean B; Bentley, Stephen D; Heyderman, Robert S
Streptococcus pneumoniae is a nasopharyngeal commensal that occasionally invades normally sterile sites to cause bloodstream infection and meningitis. Although the pneumococcal population structure and evolutionary genetics are well defined, it is not clear whether pneumococci that cause meningitis are genetically distinct from those that do not. Here, we used whole-genome sequencing of 140 isolates of S. pneumoniae recovered from bloodstream infection (n = 70) and meningitis (n = 70) to compare their genetic contents. By fitting a double-exponential decaying-function model, we show that these isolates share a core of 1,427 genes (95% confidence interval [CI], 1,425 to 1,435 genes) and that there is no difference in the core genome or accessory gene content from these disease manifestations. Gene presence/absence alone therefore does not explain the virulence behavior of pneumococci that reach the meninges. Our analysis, however, supports the requirement of a range of previously described virulence factors and vaccine candidates for both meningitis- and bacteremia-causing pneumococci. This high-resolution view suggests that, despite considerable competency for genetic exchange, all pneumococci are under considerable pressure to retain key components advantageous for colonization and transmission and that these components are essential for access to and survival in sterile sites.
Mandomando, Inácio; Sigaúque, Betuel; Morais, Luis; Espasa, Mateu; Vallès, Xavier; Sacarlal, Jahit; Macete, Eusébio; Aide, Pedro; Quintò, Llorenç; Nhampossa, Tacilta; Machevo, Sónia; Bassat, Quique; Menéndez, Clara; Ruiz, Joaquim; Roca, Anna; Alonso, Pedro L.
Antibiotic resistance in Africa is increasing but insufficiently recognized as a public health problem. However, there are scarce data for antimicrobial resistance trends among bloodstream isolates in sub-Saharan Africa. Antimicrobial drug resistance trends among bacteria isolated from blood of children < 15 years of age admitted to the Manhiça District Hospital in Mozambique during May 2001–April 2006 were monitored by disk diffusion. We documented a linear trend of increasing resistance throughout the study period to chloramphenicol among isolates of Non-typhi Salmonella (P < 0.001), Escherichia coli (P = 0.002), Staphylococcus aureus (P < 0.001), and Haemophilus influenzae (P < 0.001). Increasing resistance to ampicillin was also observed for H. influenzae isolates (P < 0.001). We report trends of increasing resistance among the most frequent etiologies of bacteremia to the most commonly used antibiotics for empirical therapy in this community. Quinolones and third-generation cephalosporines may be needed in the short term to manage community-acquired infections. PMID:20595494
Welsh, P C; Sizemore, R K
The incidence of bacteremia in the blue crab, Callinectes sapidus, is reported to be in excess of 80%. Because these results have been controversial, a field study was initiated to determine the effect of commercial capture and handling stresses on the incidence and levels of infection in blue crabs. The majority (75%) of "unstressed" crabs which were captured individually and bled immediately upon removal from the water were bacteremic, with a geometric mean level of infection of 14 CFU/ml of hemolymph. Crabs collected by crab pot, confined within these pots for as long as 24 h, and sampled immediately after removal from the water had a similar mean level of infection. Crabs subjected to the stresses of commercial capture, handling, and transport showed a higher incidence of infection (91%) and a mean infection level of 46 CFU/ml. Injuries sustained by crabs during commercial handling are thought to be associated with the higher incidence of infection. Vibrio spp. were primarily responsible for progressive infections in commercially stressed crabs and were the predominant bacterial type in heavily infected crabs. Our results indicated that uninjured healthy crabs do not have sterile hemolymph but instead harbor low-level bacterial infections. PMID:4051486
Sato, Yuichi; Miyamoto, Masahito; Yazawa, Masahiko; Nakazawa, Ryuto; Sasaki, Hideo; Miyano, Satetsu; Tsutsumi, Hisashi; Kimura, Kenjiro; Chikaraishi, Tatsuya
As the number of patients on hemodialysis increases, there will also be an increase in the number of patients with inadequate superficial veins for the creation of an autogenous arteriovenous fistula (AVF). In those patients, medical devices such as vascular prostheses or tunneled-cuffed catheters are necessary to maintain dialysis access. However, these devices are frequently associated with bacterial infection. We recently encountered a dialysis patient who underwent tunneled-cuffed catheter insertion because of the lack of usable superficial veins for autogenous access, and this patient subsequently developed catheter-related Staphylococcus aureus bacteremia with multiple metastatic infections. Despite immediate removal of the catheter, the infection persisted over an extended period, which was a condition precluding the further use of catheters or other prosthetic materials. To handle this situation, we utilized the deep brachial vein to construct an autogenous AVF. After ligating numerous branches, the vein was anastomosed to the brachial artery and then transposed to the subcutaneous space. The newly constructed autogenous AVF, which successfully kept the patient free from foreign materials, greatly contributed to the relief of persistent infection. Although the brachial vein is rarely used for AVF creation, we suggest that it can serve as an option to create an alternative AVF in a patient with inadequate superficial veins.
Introduction The relation between cellulitis and Group B streptococcus infection in newborns and small infants was first reported during the early 1980s and named cellulitis-adenitis syndrome. We report a case of a neonate with cellulitis-adenitis syndrome in an unusual location (retroauricular). Case presentation A 21-day-old Caucasian female infant was brought to the emergency department with fever, irritability and a decreased appetite. Physical examination revealed erythema and painful, mild swelling in the right retroauricular region. The blood count and C-reactive protein level were normal. She was treated with ceftriaxone. The fever and irritability were resolved after 24 hours, and the cellulitis was clearly reduced after two days of hospitalization. Blood culture yielded Group B streptococcus. Conclusion A thorough evaluation must be done, and lumbar punctures for infants with cellulitis must be considered. We emphasize the lack of data about acute phase reactants to predict bacteremia and meningitis and to adjust the duration of parenteral antibiotic therapy to address this syndrome. PMID:20062760
Mishima, Kohei; Obara, Hideaki; Sugita, Kayoko; Shinoda, Masahiro; Kitago, Minoru; Abe, Yuta; Hibi, Taizo; Yagi, Hiroshi; Matsubara, Kentaro; Mori, Takehiko; Takano, Yaoko; Fujiwara, Hiroshi; Itano, Osamu; Hasegawa, Naoki; Iwata, Satoshi; Kitagawa, Yuko
Helicobacter cinaedi (H. cinaedi), a Gram-negative spiral-shaped bacterium, is an enterohepatic non-Helicobacter pylori Helicobacter species. We report the first case of H. cinaedi bacteremia with cellulitis after liver transplantation. A 48-year-old male, who had been a dog breeder for 15 years, underwent ABO-incompatible living-donor liver transplantation for hepatitis C virus-induced decompensated cirrhosis using an anti-hepatitis B core antibody-positive graft. The patient was preoperatively administered rituximab and underwent plasma exchange twice to overcome blood type incompatibility. After discharge, he had been doing well with immunosuppression therapy comprising cyclosporine, mycophenolate mofetil, and steroid according to the ABO-incompatible protocol of our institution. However, 7 mo after transplantation, he was admitted to our hospital with a diagnosis of recurrent cellulitis on the left lower extremity, and H. cinaedi was detected by both blood culture and polymerase chain reaction analysis. Antibiotics improved his symptoms, and he was discharged at day 30 after admission. Clinicians should be more aware of H. cinaedi in immunocompromised patients, such as ABO-incompatible transplant recipients.
Mishima, Kohei; Obara, Hideaki; Sugita, Kayoko; Shinoda, Masahiro; Kitago, Minoru; Abe, Yuta; Hibi, Taizo; Yagi, Hiroshi; Matsubara, Kentaro; Mori, Takehiko; Takano, Yaoko; Fujiwara, Hiroshi; Itano, Osamu; Hasegawa, Naoki; Iwata, Satoshi; Kitagawa, Yuko
Helicobacter cinaedi (H. cinaedi), a Gram-negative spiral-shaped bacterium, is an enterohepatic non-Helicobacter pylori Helicobacter species. We report the first case of H. cinaedi bacteremia with cellulitis after liver transplantation. A 48-year-old male, who had been a dog breeder for 15 years, underwent ABO-incompatible living-donor liver transplantation for hepatitis C virus-induced decompensated cirrhosis using an anti-hepatitis B core antibody-positive graft. The patient was preoperatively administered rituximab and underwent plasma exchange twice to overcome blood type incompatibility. After discharge, he had been doing well with immunosuppression therapy comprising cyclosporine, mycophenolate mofetil, and steroid according to the ABO-incompatible protocol of our institution. However, 7 mo after transplantation, he was admitted to our hospital with a diagnosis of recurrent cellulitis on the left lower extremity, and H. cinaedi was detected by both blood culture and polymerase chain reaction analysis. Antibiotics improved his symptoms, and he was discharged at day 30 after admission. Clinicians should be more aware of H. cinaedi in immunocompromised patients, such as ABO-incompatible transplant recipients. PMID:26167092
Solomon, Laurie R; Cheesbrough, John S; Ebah, Leonard; Al-Sayed, Tamer; Heap, Michael; Millband, Nick; Waterhouse, Dee; Mitra, Sandip; Curry, Alan; Saxena, Rema; Bhat, Rammohan; Schulz, Michael; Diggle, Peter
Bacteremia is a major cause of morbidity in patients using intravascular catheters. Interdialytic locking with antibiotics decreases the incidence of bacteremia, but risks antibiotic resistance. Taurolidine is a nontoxic broad-spectrum antimicrobial agent that has not been associated with resistance. Preliminary evidence suggests that taurolidine-citrate locks decrease bacteremia, but cause flow problems in established catheters. Double-blind randomized controlled trial. Interdialytic locking with taurolidine and citrate (1.35% taurolidine and 4% citrate) compared with heparin (5,000 U/mL) started at catheter insertion. 110 adult hemodialysis patients with tunneled cuffed intravascular catheters inserted at 3 centers in Northwest England. Primary end points were time to first bacteremia episode from any cause and time to first use of thrombolytic therapy. There were 11 bacteremic episodes in the taurolidine-citrate group and 23 in the heparin group (1.4 and 2.4 episodes/1,000 patient-days, respectively; P = 0.1). There was no significant benefit of taurolidine-citrate versus heparin for time to first bacteremia (hazard ratio, 0.66; 95% CI, 0.2-1.6: P = 0.4). Taurolidine-citrate was associated with fewer infections caused by Gram-negative organisms than heparin (0.2 vs 1.1 infections/1,000 patient-days; P = 0.02); however, there was no difference for Gram-positive organisms (1.1 vs 1.2 infections/1,000 patient-days; P = 0.8). There was a greater need for thrombolytic therapy in the taurolidine-citrate versus heparin group (hazard ratio, 2.5; 95% CI, 1.3-5.2; P = 0.008). Small sample size. The study included bacteremia from all causes and was not specific for catheter-related bacteremia. Taurolidine-citrate use did not decrease all-cause bacteremia and was associated with a greater need for thrombolytic treatment. There was a decrease in infections caused by Gram-negative organisms and a trend to a lower frequency of bacteremia, which warrants further study
Sarma, Jayanta B; Marshall, Bryan; Cleeve, Victoria; Tate, David; Oswald, Tamsin
In November 2004, a national target was set for the English hospital trusts to reduce the Meticillin-Resistant Staphylococcus aureus (MRSA) bacteremia rate by 60% by April 2008 against the number during 2003/04 (baseline year). In our organisation the number of MRSA bacteremias had risen since 2002 and peaked at 75 in 2005/06. A target was set to reduce the number and series of specific and non- specific interventions was introduced including universal MRSA screening. This study analyzes the impact of universal MRSA screening using a quasi-experimental design using routinely gathered data. This study used data gathered routinely for clinical governance, quality control, financial management and outbreak monitoring purposes. Interrupted Time Series (ITS) analysis of 15 pre- and 19 post- universal MRSA screening (and decolonisation) quarterly numbers of bacteremias was carried out where Meticillin-Sensitive Staphylococcus aureus (MSSA) numbers served as non-equivalent dependent variable (control). An immediate sharp fall in MRSA bacteremias was observed following the universal MRSA screening (and decolonisation) commenced in Q2, 2007. The number dropped sharply from 23 (Q2, 2007) to 10 (Q3, 2007) for all MRSA bacteremias, and, from 15 (Q2, 2007) to 6 (Q3, 2007) for bacteremias ≥48 hours of hospitalization. The declining trend continued reaching zero in Q2, 2009 and Q4, 2010 for those with ≥48 hours of hospitalization and all bacteremias, respectively. ITS analysis revealed significant impact of universal MRSA screening on all MRSA bacteremias (β2 -0.554, p 0.000) and those with ≥48 of hospitalization (β2 -0.577, p 0.001). Impact estimation predicted 17 and 13 bacteremias for all and those with ≥48 hours hospitalization, respectively in the 19th quarter post-intervention, if the intervention did not occur. The number of MRSA isolates from non-blood culture systemic sources as percentage of admissions also dropped significantly from 3.32% in Q2, 2007 to 1
Kleinberg, Michael; Sorkin, John D.; Netzer, Giora; Johnson, Jennifer K.; Shardell, Michelle; Thom, Kerri A.; Harris, Anthony D.; Roghmann, Mary-Claire
We hypothesized that prior colonization with antibiotic-resistant Gram-negative bacteria is associated with increased risk of subsequent antibiotic-resistant Gram-negative bacteremia among cancer patients. We performed a matched case-control study. Cases were cancer patients with a blood culture positive for antibiotic-resistant Gram-negative bacteria. Controls were cancer patients with a blood culture not positive for antibiotic-resistant Gram-negative bacteria. Prior colonization was defined as any antibiotic-resistant Gram-negative bacteria in surveillance or non-sterile-site cultures obtained 2–365 days before the bacteremia. Thirty-two (37%) of 86 cases and 27 (8%) of 323 matched controls were previously colonized by any antibiotic-resistant Gram-negative bacteria. Prior colonization was strongly associated with antibiotic-resistant Gram-negative bacteremia (odds ratio [OR] 7.2, 95% confidence interval [CI] 3.5–14.7) after controlling for recent treatment with piperacillin-tazobactam (OR 2.5, 95% CI 1.3–4.8). In these patients with suspected bacteremia, prior cultures may predict increased risk of antibiotic-resistant Gram-negative bacteremia. PMID:24582582
Waddell, R D; Lishimpi, K; von Reyn, C F; Chintu, C; Baboo, K S; Kreiswirth, B; Talbot, E A; Karagas, M R
Among adults with advanced HIV infection in developing countries, bacteremia due to Mycobacterium tuberculosis (MTB) is common and bacteremia due to M. bovis (bacille Calmette-Guérin; BCG) is rare. Comparable data are not available for children with HIV. To compare the prevalence of bacteremia due to M. tuberculosis or M. bovis BCG in hospitalized children and adults with HIV infection in a developing country with a high prevalence of tuberculosis and HIV and > 95% BCG immunization coverage. Descriptive cross-sectional study. Prospectively hospitalized patients in Lusaka, Zambia who were suspected to have HIV infection underwent phlebotomy for HIV ELISA, HIV viral load, and lysis-centrifugation blood culture for mycobacteria. Histories were obtained and patients were examined for BCG scars. Mycobacterial isolates were identified using DNA probes for MTB complex (MTBC), multiplex PCR and IS6110 typing. The median age of 387 HIV-positive children was 15 months; 98% were BCG immunized. The median age of 344 HIV-positive adults was 32 years; 44% were BCG immunized. Blood cultures were positive for mycobacteria in six children (2%) and 38 adults(11%) (P < 0.001). The six pediatric isolates included five MTBC (40% clustered) and one BCG. The 38 adult isolates included 36 MTBC (16% clustered) and two M. avium complex. Bacteremia due to MTB is less common among children than adults with advanced HIV infection in Zambia. Bacteremia due to M. bovis BCG is rare even among children with recent BCG immunization and symptomatic HIV infection.
Meini, Simone; Laureano, Raffaele; Fani, Lucia; Tascini, Carlo; Galano, Angelo; Antonelli, Alberto; Rossolini, Gian Maria
Probiotics are widely investigated in the treatment of various bowel diseases. However, they may also have a pathogenic potential, and the role of Lactobacillus spp. as opportunistic pathogens, mostly following disruption of the intestinal mucosa, is emerging. We report on a case of bacteremia caused by L. rhamnosus GG in an adult patient affected by severe active ulcerative colitis under treatment with corticosteroids and mesalazine. Lactobacillus bacteremia was associated with candidemia and occurred while the patient was receiving a probiotic formulation containing the same strain (as determined by PFGE typing), and was being concomitantly treated with i.v. vancomycin, to which the Lactobacillus strain was resistant. L. rhamnosus GG bacteremia, therefore, was apparently related with translocation of bacteria from the intestinal lumen to the blood. Pending conclusive evidence, use of probiotics should be considered with caution in case of active severe inflammatory bowel diseases with mucosal disruption.
Gudiol, Francisco; Aguado, José María; Pascual, Alvaro; Pujol, Miquel; Almirante, Benito; Miró, José María; Cercenado, Emilia; Domínguez, María de Los Angeles; Soriano, Alex; Rodríguez-Baño, Jesús; Vallés, Jordi; Palomar, Mercedes; Tornos, Pilar; Bouza, Emilio
Bacteremia and endocarditis due to methicillin-resistant Staphylococcus aureus (MRSA) are prevalent and clinically important. The rise in MRSA bacteremia and endocarditis is related with the increasing use of venous catheters and other vascular procedures. Glycopeptides have been the reference drugs for treating these infections. Unfortunately their activity is not completely satisfactory, particularly against MRSA strains with MICs > 1 microg/mL. The development of new antibiotics, such as linezolid and daptomycin, and the promise of future compounds (dalvabancin, ceftobiprole and telavancin) may change the expectatives in this field.The principal aim of this consensus document was to formulate several recommendations to improve the outcome of MRSA bacteremia and endocarditis, based on the latest reported scientific evidence. This document specifically analyzes the approach for three clinical situations: venous catheter-related bacteremia, persistent bacteremia, and infective endocarditis due to MRSA.
Hongsuwan, Maliwan; Srisamang, Pramot; Kanoksil, Manas; Luangasanatip, Nantasit; Jatapai, Anchalee; Day, Nicholas P; Peacock, Sharon J; Cooper, Ben S; Limmathurotsakul, Direk
Little is known about the epidemiology of nosocomial bloodstream infections in public hospitals in developing countries. We evaluated trends in incidence of hospital-acquired bacteremia (HAB) and healthcare-associated bacteremia (HCAB) and associated mortality in a developing country using routinely available databases. Information from the microbiology and hospital databases of 10 provincial hospitals in northeast Thailand was linked with the national death registry for 2004-2010. Bacteremia was considered hospital-acquired if detected after the first two days of hospital admission, and healthcare-associated if detected within two days of hospital admission with a prior inpatient episode in the preceding 30 days. A total of 3,424 patients out of 1,069,443 at risk developed HAB and 2,184 out of 119,286 at risk had HCAB. Of these 1,559 (45.5%) and 913 (41.8%) died within 30 days, respectively. Between 2004 and 2010, the incidence rate of HAB increased from 0.6 to 0.8 per 1,000 patient-days at risk (p<0.001), and the cumulative incidence of HCAB increased from 1.2 to 2.0 per 100 readmissions (p<0.001). The most common causes of HAB were Acinetobacter spp. (16.2%), Klebsiella pneumoniae (13.9%), and Staphylococcus aureus (13.9%), while those of HCAB were Escherichia coli (26.3%), S. aureus (14.0%), and K. pneumoniae (9.7%). There was an overall increase over time in the proportions of ESBL-producing E. coli causing HAB and HCAB. This study demonstrates a high and increasing incidence of HAB and HCAB in provincial hospitals in northeast Thailand, increasing proportions of ESBL-producing isolates, and very high associated mortality.
Hongsuwan, Maliwan; Srisamang, Pramot; Kanoksil, Manas; Luangasanatip, Nantasit; Jatapai, Anchalee; Day, Nicholas P.; Peacock, Sharon J.; Cooper, Ben S.; Limmathurotsakul, Direk
Background Little is known about the epidemiology of nosocomial bloodstream infections in public hospitals in developing countries. We evaluated trends in incidence of hospital-acquired bacteremia (HAB) and healthcare-associated bacteremia (HCAB) and associated mortality in a developing country using routinely available databases. Methods Information from the microbiology and hospital databases of 10 provincial hospitals in northeast Thailand was linked with the national death registry for 2004–2010. Bacteremia was considered hospital-acquired if detected after the first two days of hospital admission, and healthcare-associated if detected within two days of hospital admission with a prior inpatient episode in the preceding 30 days. Results A total of 3,424 patients out of 1,069,443 at risk developed HAB and 2,184 out of 119,286 at risk had HCAB. Of these 1,559 (45.5%) and 913 (41.8%) died within 30 days, respectively. Between 2004 and 2010, the incidence rate of HAB increased from 0.6 to 0.8 per 1,000 patient-days at risk (p<0.001), and the cumulative incidence of HCAB increased from 1.2 to 2.0 per 100 readmissions (p<0.001). The most common causes of HAB were Acinetobacter spp. (16.2%), Klebsiella pneumoniae (13.9%), and Staphylococcus aureus (13.9%), while those of HCAB were Escherichia coli (26.3%), S. aureus (14.0%), and K. pneumoniae (9.7%). There was an overall increase over time in the proportions of ESBL-producing E. coli causing HAB and HCAB. Conclusions This study demonstrates a high and increasing incidence of HAB and HCAB in provincial hospitals in northeast Thailand, increasing proportions of ESBL-producing isolates, and very high associated mortality. PMID:25310563
Tena, D; Carranza, R; Barberá, J R; Valdezate, S; Garrancho, J M; Arranz, M; Sáez-Nieto, J A
Achromobacter xylosoxidans is a rare cause of bacteremia. Over a 2-week period, A. xylosoxidans subsp. xylosoxidans was isolated from blood cultures of four hemodialysis patients with long-term intravascular catheters. A culture from one atomizer that contained diluted 2.5% chlorhexidine, which had been used to disinfect the skin, yielded A. xylosoxidans subsp. xylosoxidans. No further cases were diagnosed once the use of this atomizer was discontinued. Five outbreak-related strains from the four patients and the atomizer were tested by pulsed-field gel electrophoresis (PFGE) under XbaI restriction. The isolates from the first three patients and the atomizer had identical PFGE patterns, confirming the atomizer as the source of the outbreak. The strain isolated from the fourth patient had six more bands than the outbreak strain and was considered possibly related to the outbreak strain. All patients were treated with intravenous levofloxacin. The catheter was removed in only one patient. The three patients in whom the catheter was left in place were also treated with antibiotic lock therapy with levofloxacin. All four patients were cured. This is believed to be the first reported outbreak of central venous catheter-related bacteremia due to A. xylosoxidans and the second reported outbreak with this organism associated with chlorhexidine atomizers. The use of diluted chlorhexidine via atomizers can be dangerous for the care of venous catheters and should be called into question. Patients with long-term intravascular catheter-related bacteremia due to this organism can be treated successfully with systemic antimicrobial therapy in addition to antibiotic lock therapy without catheter removal.
Background When Staphylococcus aureus is isolated in urine, it is thought to usually represent hematogenous spread. Because such spread might have special clinical significance, we evaluated predictors and outcomes of S. aureus bacteriuria among patients with S. aureus bacteremia. Methods A case-control study was performed at John H. Stroger Jr. Hospital of Cook County among adult inpatients during January 2002-December 2006. Cases and controls had positive and negative urine cultures, respectively, for S. aureus, within 72 hours of positive blood culture for S. aureus. Controls were sampled randomly in a 1:4 ratio. Univariate and multivariable logistic regression analyses were done. Results Overall, 59% of patients were African-American, 12% died, 56% of infections had community-onset infections, and 58% were infected with methicillin-susceptible S. aureus (MSSA). Among 61 cases and 247 controls, predictors of S. aureus bacteriuria on multivariate analysis were urological surgery (OR = 3.4, p = 0.06) and genitourinary infection (OR = 9.2, p = 0.002). Among patients who died, there were significantly more patients with bacteriuria than among patients who survived (39% vs. 17%; p = 0.002). In multiple Cox regression analysis, death risks in bacteremic patients were bacteriuria (hazard ratio 2.9, CI 1.4-5.9, p = 0.004), bladder catheter use (2.0, 1.0-4.0, p = 0.06), and Charlson score (1.1, 1.1-1.3, p = 0.02). Neither length of stay nor methicillin-resistant Staphylococcus aureus (MRSA) infection was a predictor of S. aureus bacteriuria or death. Conclusions Among patients with S. aureus bacteremia, those with S. aureus bacteriuria had 3-fold higher mortality than those without bacteriuria, even after adjustment for comorbidities. Bacteriuria may identify patients with more severe bacteremia, who are at risk of worse outcomes. PMID:20667139
Johnson, D E; Russell, R G; Lockatell, C V; Zulty, J C; Warren, J W
Urethral obstruction may be caused by prostatic hypertrophy, urethral stricture, or encrustation of a urethral-catheter lumen. Bacteriuria often complicates these obstructions. The sequelae include fever, acute pyelonephritis, chronic renal inflammation, and death. We hypothesized that even brief obstruction of the urinary tract containing a nonvirulent bacterium would result in these complications. Mice challenged transurethrally with Escherichia coli FN414, which is rapidly eliminated from normal mice without causing bacteriuria, bacteremia, or renal pathology, were subjected to reversible urethral obstruction by coating the urethral meatus with collodion for 1, 3, or 6 h. The majority of mice obstructed for 1 h demonstrated parenchymal renal inflammation 48 h later. At the end of 3 h of obstruction, 9 of 10 mice were bacteremic; some bacteremias were present at 48 h after removal of the obstruction. At that time, more severe renal inflammation was seen in these mice. As little as 6 h of obstruction resulted not only in the acute chang