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Molecular characterization and antibiotic resistance of Streptococcus dysgalactiae subspecies equisimilis isolated from patients with streptococcal toxic shock syndrome

2017; Elsevier BV; Volume: 24; Issue: 2 Linguagem: Inglês

10.1016/j.jiac.2017.09.013

1437-7780

Tadayoshi Ikebe, Rumi Okuno, Mari Sasaki, Yoshiko Kanda, Hitoshi Otsuka, Ryuji Kawahara, Hitomi Ohya, Miyuki Suzuki, Kaoru Uchida, Hisako Nihonmatsu, M. Ohnishi, Y. Morimoto, Yumiko Sakamoto, Shin‐ichi Sato, Manabu Musashi, Akira Shirasawa, Takayuki Konno, Takashi Kobayashi, Yoshiaki Watanabe, Junji Seto, Yoshinao Kobayashi, Kazumi Sakai, Yoko Aihara, Reiko Kiritani, S. Kataoka, M. Takayama, Noriko Hamamoto, Masaki Nakamura, Y. Matsumoto, Eiko Yuzawa, Hiroaki Satoh, Yasuhiko Igawa, Hiromi Nagaoka, Hidetoshi Ehara, Yutaka Tsuchiya, K. Tomari, Kouji Takeuchi, Yoshie Tsunomori, H. Kawai, Hiroko Akita, C. Kuribayashi, Jun Uchida, Fumiko Ichihara, Kentaro Semba, Akihiko Tokaji, Yuki Carle, Masahisa Honda, Etsuko Nakamura, M Ogata, Noboru Tsuru, Tsuyoshi Takara,

Bacterial Identification and Susceptibility Testing

Streptococcal toxic shock syndrome (STSS) is a severe invasive infection characterized by the sudden onset of shock, multiorgan failure, and high mortality. Although STSS is mainly caused by Streptococcus pyogenes, group G streptococcus identified as S. dysgalactiae subsp. equisimilis (SDSE) causing STSS has also been reported; however, no study has analyzed >100 isolates of SDSE causing STSS. Therefore, we characterized the emm genotype of 173 SDSE isolates obtained from STSS patients in Japan during 2014-2016 and performed antimicrobial susceptibility testing using the broth microdilution method and emm gene typing. The predominant emm genotype was found to be stG6792, followed by stG485, stG245, stG10, stG6, and stG2078. These six genotypes constituted more than 75% of the STSS isolates. The proportion of each emm genotype in STSS isolates correlated with that in invasive isolates previously reported. We found that 16.2% of the isolates showed clindamycin resistance. The proportion of clindamycin-resistant SDSE isolates was significantly higher than that of S. pyogenes isolates. Thus, while treating STSS caused by SDSE, it is necessary to consider the possibility of clindamycin resistance and to ensure judicious use of the drug.