2014•Journal of Clinical MicrobiologyOpen access

Characterization of Multidrug-Resistant Group B Streptococci with Reduced Penicillin Susceptibility Forming Small Non-Beta-Hemolytic Colonies on Sheep Blood Agar Plates

Hirotsugu Banno, Kouji Kimura, Yosuke Tanaka, Hiromitsu Kitanaka, Wanchun Jin, Jun‐ichi Wachino, Keiko Yamada, Keigo Shibayama, Yoshichika Arakawa

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Abstract

We isolated and characterized three multidrug-resistant clinical isolates of group B streptococci with reduced penicillin susceptibility (PRGBS) that formed small non-beta-hemolytic colonies on sheep blood agar plates but grew well on chocolate agar plates. They can be overlooked in the bacterial identification step, leading to clinical misdiagnosis and treatment failure.

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Key concepts: Microbiology, Penicillin, Agar, Agar plate, Multiple drug resistance, Antibiotics, Group A, Biology