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A total of 232 isolates of gram-negative bacteria were recovered from mammals, reptiles, and birds housed at Asa Zoological Park, Hiroshima prefecture, Japan. Forty-nine isolates (21.1%) showed multidrug resistance phenotypes and harbored at least one antimicrobial resistance gene. PCR and DNA sequencing identified class 1 and class 2 integrons and many ␤-lactamase-encoding genes, in addition to a novel AmpC ␤-lactamase gene, bla CMY-26 . Furthermore, the plasmid-mediated quinolone resistance genes qnr and aac(6)-Ib-cr were also identified.

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