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COMPARATIVE STUDY
JOURNAL ARTICLE
Clinical features of enterococcal bacteremia due to ampicillin-susceptible and ampicillin-resistant enterococci: An eight-year retrospective comparison study.
Journal of Infection and Chemotherapy : Official Journal of the Japan Society of Chemotherapy 2015 July
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.
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