Emergence of Salmonella enterica Serovar Infantis Harboring IncI1 Plasmid with blaCTX-M-₁₄ in a Broiler Farm 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
  • YOKOI Tomoki
    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
  • MIYASAKO Daisuke
    Laboratory of Veterinary Public Health, Joint Faculty of Veterinary Medicine, Kagoshima University, 1–21–24 Korimoto, Kagoshima 890–0065, Japan
  • IWATA Hiroyuki
    Department of Veterinary Medicine, 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

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タイトル別名
  • Emergence of <i>Salmonella enterica</i> Serovar Infantis Harboring IncI1 Plasmid with <i>bla</i><sub>CTX-M-14</sub> in a Broiler Farm in Japan

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Cefotaxime (CTX)-resistant and -susceptible Salmonella enterica serovar Infantis isolates obtained from broilers raised on a farm in January 2010 in Japan were characterized to establish their resistance determinants. The CTX-resistant isolates produced CTX-M-14 extended-spectrum β-lactamase and harbored 2 distinct plasmid of approximately 140- and 95-kb, whereas the CTX-susceptible isolates harbored one 140-kb plasmid. The 95-kb plasmids were replicon typed as IncI1 carrying the blaCTX-M-14 gene, while the 140-kb plasmids were IncP and harbored the aphA1, aadA1, tetA, and sul1 genes. Genetic fingerprinting by pulsed-field gel electrophoresis revealed similar macrorestriction profiles amongst CTX-resistant and susceptible isolates, suggesting a clonal relationship. The presence of CTX-resistant S. Infantis on a broiler farm has occurred through the acquisition of IncI1 resistance plasmid.

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