Clinical isolates of Streptococcus mitis/oralis-related species with reduced carbapenem susceptibility, harboring amino acid substitutions in penicillin-binding proteins in Japan

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Abstract

Streptococcus mitis/oralis group isolates with reduced carbapenem susceptibility have been reported, but its isolation rate in Japan is unknown. We collected 356 clinical α-hemolytic streptococcal isolates and identified 142 of them as S. mitis/oralis using partial sodA sequencing. The rate of meropenem non-susceptibility was 17.6% (25/142). All 25 carbapenem-non-susceptible isolates harbored amino acid substitutions in/near the conserved motifs in PBP1A, PBP2B, and PBP2X. Carbapenem non-susceptibility is common among S. mitis/oralis group isolates in Japan.

Original languageEnglish
JournalAntimicrobial agents and chemotherapy
Volume68
Issue number4
DOIs
Publication statusPublished - 04-2024
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Pharmacology
  • Pharmacology (medical)
  • Infectious Diseases

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