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Antimicrob Agents Chemother. 2010 Apr;54(4):1623-6. doi: 10.1128/AAC.01361-09. Epub 2010 Jan 25.

High diversity of extended-spectrum beta-lactamases in Escherichia coli isolates from Italian broiler flocks.

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  • 1Department of Veterinary Disease Biology, University of Copenhagen, Stigbøjlen 4, 1870 Frederiksberg C, Denmark. vbo@life.ku.dk

Abstract

We characterized 67 Escherichia coli isolates with reduced susceptibility to cefotaxime or ceftiofur obtained from healthy broilers housed in five Italian farms. The bla(CTX-M-1), bla(CTX-M-32) and bla(SHV-12) beta-lactamase genes were identified on IncI1, IncN, or IncFIB plasmids. Considerable genetic diversity was detected among the extended-spectrum beta-lactamase (ESBL)-producing isolates, and we identified indistinguishable strains in unrelated farms and indistinguishable plasmids in genetically unrelated strains. The detection of highly mobile plasmids suggests a potential animal reservoir for beta-lactamase genes.

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