Abstract
Sixty-five CTX-M-2/15/14 extended-spectrum-β-lactamase-producing Enterobacteriaceae were isolated from 258,888 mastitic milk samples from Japanese dairy farms between 2007 and 2011. CTX-M-2-producing Klebsiella pneumoniae and CTX-M-15-producing Escherichia coli were the predominant strains isolated. There was no predominant clonal type, and clonal diversity was found even in strains isolated from a single farm.
MeSH terms
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Animals
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Cattle
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Cluster Analysis
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Enterobacteriaceae / enzymology*
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Enterobacteriaceae / genetics
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Enterobacteriaceae / isolation & purification
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Enterobacteriaceae Infections / epidemiology
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Enterobacteriaceae Infections / microbiology
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Enterobacteriaceae Infections / veterinary*
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Female
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Genetic Variation
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Japan
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Mastitis, Bovine / epidemiology
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Mastitis, Bovine / microbiology*
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Milk / microbiology*
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Molecular Epidemiology
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Molecular Typing
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Prevalence
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beta-Lactamases / genetics*