Genetic characteristics of CTX-M-type extended-spectrum-β-lactamase (ESBL)-producing enterobacteriaceae involved in mastitis cases on Japanese dairy farms, 2007 to 2011

J Clin Microbiol. 2013 Sep;51(9):3117-22. doi: 10.1128/JCM.00920-13. Epub 2013 Jul 10.

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

  • Animals
  • Cattle
  • Cluster Analysis
  • Enterobacteriaceae / enzymology*
  • Enterobacteriaceae / genetics
  • Enterobacteriaceae / isolation & purification
  • Enterobacteriaceae Infections / epidemiology
  • Enterobacteriaceae Infections / microbiology
  • Enterobacteriaceae Infections / veterinary*
  • Female
  • Genetic Variation
  • Japan
  • Mastitis, Bovine / epidemiology
  • Mastitis, Bovine / microbiology*
  • Milk / microbiology*
  • Molecular Epidemiology
  • Molecular Typing
  • Prevalence
  • beta-Lactamases / genetics*

Substances

  • beta-Lactamases