The Journal of Japanese Society for Clinical Microbiology

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[Vol.27 No.3 contents]
Japanese / English

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Article in Japanese

ArticleTitle Bacteremia due to Bacteroides and Parabacteroides spp.: Clinical Characteristics of 138 Patients
Language J
AuthorList Daisuke Suzuki1), Ryota Hase1), Kohei Hashimoto2), Tomo Yamada2), Akihiro Toguchi2), Yoshihito Otsuka2), Naoto Hosokawa1)
Affiliation 1) Department of Infectious Diseases, Kameda Medical Center
2) Laboratory of Medicine, Kameda Medical Center
Publication J.J.C.M.: 27 (3), 168-176, 2017
Received December 22, 2016
Accepted March 17, 2017
Abstract The Clinical and microbiological data of 138 patients with bacteremia due to Bacteroides and Parabacteroides spp. were reviewed at the Kameda Medical Center between September 4, 2007 and September 3, 2014. B. fragilis accounted for 56 (39%) of 143 isolates. The sites of infection were intra-abdominal (79%), decubitus ulcer (6%), foot gangrene (4%), urinary tract (4%), and female genital tract in one patient (1%). Mother-to-fetus transmission of infection was not observed. Polymicrobial bacteremia was observed in 52 (38%) patients; with Escherichia coli - detected in 18 of the 52 patients - being the most frequently detected species with Bacteroides or Parabacteroides spp.. Enterococcus spp., obligate anaerobic gram-positive bacilli, and strains belonging to Enterobacteriaceae were detected with Bacteroides or Parabacteroides spp. mainly in intra-abdominal infections, whereas Streptococcus, Staphylococcus, and Peptostreptococcus spp. were detected in skin and soft-tissue infections. The 7- and 30-day mortality rates were 10% and 21%, respectively. Antibiotics effective against anaerobic bacteria were administered to 113 patients (82%). Patients who received these antibiotics within 2 days of blood culture collection showed a lower mortality rate than those who did not; however, the difference was not statistically significant. Our results suggested that the mortality rate may be decreased by early-stage administration of antibiotics effective against anaerobic bacteria.
Keywords Bacteroides, Parabacteroides
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