TY - JOUR
T1 - High isolation rate of MDR group B streptococci with reduced penicillin susceptibility in Japan
AU - Seki, Tomomi
AU - Kimura, Kouji
AU - Reid, Megan E.
AU - Miyazaki, Akira
AU - Banno, Hirotsugu
AU - Jin, Wanchun
AU - Wachino, Jun Ichi
AU - Yamada, Keiko
AU - Arakawa, Yoshichika
N1 - Publisher Copyright:
© The Author 2015. Published by Oxford University Press on behalf of the British Society for Antimicrobial Chemotherapy. All rights reserved.
PY - 2015/10
Y1 - 2015/10
N2 - 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.
AB - 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.
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U2 - 10.1093/jac/dkv203
DO - 10.1093/jac/dkv203
M3 - Article
C2 - 26169560
AN - SCOPUS:84943789246
SN - 0305-7453
VL - 70
SP - 2725
EP - 2728
JO - Journal of Antimicrobial Chemotherapy
JF - Journal of Antimicrobial Chemotherapy
IS - 10
ER -