Prevalence and Epidemiological Relationship of CMY-2 AmpC β-Lactamase and CTX-M Extended-Spectrum β-Lactamase-Producing Escherichia coli Isolates from Broiler Farms in Japan

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  • KAMEYAMA Mitsuhiro
    Yamaguchi Prefectural Institute of Public Health and Environment, 2–5–67 Aoi, Yamaguchi 753–0821, Japan
  • CHUMA Takehisa
    Laboratory of Veterinary Public Health, Joint Faculty of Veterinary Medicine, Kagoshima University, 1–21–24 Korimoto, Kagoshima 890–0065, Japan
  • YABATA Junko
    Yamaguchi Prefectural Institute of Public Health and Environment, 2–5–67 Aoi, Yamaguchi 753–0821, Japan
  • TOMINAGA Kiyoshi
    Yamaguchi Prefectural Institute of Public Health and Environment, 2–5–67 Aoi, Yamaguchi 753–0821, Japan
  • IWATA Hiroyuki
    Laboratory of Veterinary Hygiene, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677–1 Yoshida, Yamaguchi 753–8515, Japan
  • OKAMOTO Karoku
    Laboratory of Veterinary Public Health, Joint Faculty of Veterinary Medicine, Kagoshima University, 1–21–24 Korimoto, Kagoshima 890–0065, Japan

書誌事項

タイトル別名
  • Prevalence and Epidemiological Relationship of CMY-2 AmpC β-Lactamase and CTX-M Extended-Spectrum β-Lactamase-Producing <i>Escherichia coli</i> Isolates from Broiler Farms in Japan
  • Prevalence and epidemiological relationship of CMY-2 AmpC ß-lactamase and CTX-M extended-spectrum ß-lactamase-producing Escherichia coli isolates from broiler farms in Japan

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抄録

To evaluate the prevalence of extended-spectrum cephalosporin (ESC)-resistant Enterobacteriaceae in broiler chickens, 41 rectal samples taken from 4 commercial farms were examined. Desoxycholate hydrogen sulfide lactose agars, supplemented with either 4 μg/ml cefotaxime or 16 μg/ml ceftazidime, were used to screen ESC-resistant bacteria. ESC-resistant bacteria were isolated from all samples. Of the 164 ESC-resistant bacteria (included 4 isolates per a sample), 163 were Escherichia coli, while 1 isolate was identified as Enterobacter cloacae. Extended-spectrum β-lactamase (ESBL) genes and plasmid-mediated AmpC β-lactamase genes in the isolates were determined by PCR and sequencing. One AmpC β-lactamase gene, blaCMY-2 (66%), and 4 ESBL genes, blaCTX-M-1 (26%), blaCTX-M-55 (10%), blaSHV-5 (4%) and blaCTX-M-2 (3%), were detected in the E. coli isolates. The epidemiological relationship of the CMY-2 and CTX-M β-lactamase-producing isolates among the farms was analyzed by pulsed-field gel electrophoresis using the XbaI restriction enzyme. Forty-one (Y1–Y41) and 14 (X1–X14) clusters were found in the CMY-2 and CTX-M-carrying E. coli isolates, respectively. Some clusters included isolates derived from more than 1 farm, indicating some cross-contamination of clonal strains and spread of CMY-2 AmpC β-lactamase or CTX-M ESBL among the farms.

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