Prevalence of extended-spectrum beta-lactamase-producing Escherichia coli in cattle and swine at a slaughterhouse in Tottori Prefecture, Japan
2019
Mizutani, K. (Meat Inspection Center, Tottori Prefecture, Saihaku-gun (Japan)) | Orioku, M. | Oshimo, S. | Ueda, Y.
We investigated the prevalence of extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli in cattle and swine at a slaughterhouse in Tottori Prefecture, Japan. ESBL-producing E. coli strains were isolated from the cecal contents in 1 of 93 cattle (1.1%) and 27 of 98 swine (27.6%). The strain isolated from cattle belonged to serotype O6, 10 strains isolated from swine belonged to O143, 2 strains isolated from swine belonged to O25, and others were untypeable. Regarding the ESBL genes of the isolates, 1 isolate from cattle and 22 isolates from swine were classified as the CTX-M-1 group. Of the other isolates from swine, 3 isolates and 2 isolates were classified as CTX-M-2 group and CTX-M-9 group, respectively. As for the antimicrobial susceptibility of the strains isolated from swine, 7 strains, 2 strains and 6 strains were resistant to fluoroquinolones, fosfomycin, and a combination of sulfamethoxazole/trimethoprim, respectively. Regarding the virulence-associated genes of the strains isolated from swine, 1 strain carried both est I and est II, and 1 strain carried est II. The study showed that the prevalence of ESBL-producing E. coli was high in swine of Tottori Prefecture and some strains exhibited multidrug resistance or carried virulence-associated genes.
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