High isolation rate of MDR group B streptococci with reduced penicillin susceptibility in Japan

Tomomi Seki, Kouji Kimura, Megan E. Reid, Akira Miyazaki, Hirotsugu Banno, Wanchun Jin, Jun Ichi Wachino, Keiko Yamada, Yoshichika Arakawa

研究成果: ジャーナルへの寄稿学術論文査読

77 被引用数 (Scopus)

抄録

Objectives: In Japan, the isolation rate of group B Streptococcus (GBS) with reduced penicillin susceptibility (PRGBS) was 2.3% between 2005 and 2006. However, no data on this have been available since then; moreover, the isolation rate of MDR-PRGBS has never been reported. The aim of this study was to obtain recent data on the PRGBS isolation rate and to investigate, for the first time, the isolation rate of MDR-PRGBS. Methods: We collected 306 clinical GBS isolates from various regions in Japan between January 2012 and July 2013. The MICs of penicillin G, oxacillin, ceftizoxime and ceftibuten for all GBS isolates and the MICs of erythromycin and levofloxacin for PRGBS isolates were determined by the agar dilution method. The mutations in the genes involved in antibiotic resistance and antibiotic resistance geneswere analysed by PCR and DNA sequencing. Results: We detected 45 clinical PRGBS isolates, with a PRGBS isolation rate among GBS of 14.7% (45/306). Among the PRGBS isolates, 32 (32/45, 71.1%) and 43 (43/45, 95.6%) were resistant/non-susceptible to erythromycin and levofloxacin, respectively. Furthermore, 31 PRGBS isolates, which constituted 68.9% of the PRGBS (31/45) and 10.1% of the GBS (31/306), respectively, were resistant/non-susceptible to both macrolides and fluoroquinolones, indicating multidrug resistance. Conclusions: These results suggest that the number of clinical PRGBS isolates with a tendency to multidrug resistance increased rapidly between 2005-06 and 2012-13 in Japan.

本文言語英語
ページ(範囲)2725-2728
ページ数4
ジャーナルJournal of Antimicrobial Chemotherapy
70
10
DOI
出版ステータス出版済み - 10-2015
外部発表はい

All Science Journal Classification (ASJC) codes

  • 薬理学
  • 微生物学(医療)
  • 感染症
  • 薬理学(医学)

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