Detection and characterization of pCT-like plasmid vectors for blaCTX-M-14 in Escherichia coli isolates from humans, turkeys and cattle in England and Wales

M.O. Stokes, J.L. Cottel, L.J. Piddock, G. Wu, M. Wootton, D.J. Mevius, L.P. Randall, C.J. Teale, M.D. Fielder, N.G. Coldham

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28 Citations (Scopus)

Abstract

Objectives - To detect and characterize Escherichia coli strains and pCT-like plasmids implicated in the dissemination of the CTX-M-14 gene in animals and humans, in England and Wales. Methods UK CTX-M-14-producing E. coli (n¿=¿70) from cattle (n¿=¿33), turkeys (n¿=¿9), sheep (n¿=¿2) and humans (n¿=¿26) were screened using multiplex PCR for the detection of a previously characterized plasmid, pCT. Isolates found to be carrying two or more pCT genetic markers were further analysed using PFGE. Their antimicrobial-resistance genes and virulence genes were also determined. These plasmids were transferred to Salmonella enterica serotype Typhimurium 26R and further examined for incompatibility type, genetic environment of the blaCTX-M-14 gene, size, restriction fragment length polymorphism (RFLP) and nikB sequence. Results - The 25 E. coli isolates carrying pCT genetic markers generated 19 different PFGE profiles, and 23 isolates had different virulence and antimicrobial-resistance gene patterns. One isolate from cattle was a verotoxigenic E. coli (‘VTEC’); the rest were commensal or extra-intestinal pathogenic E. coli. pCT-like plasmids with similar molecular characteristics (size, replicon type, RFLP pattern, pCT markers and genetic environment of the blaCTX-M-14 gene) were detected in 21/25 of the field isolates, which comprised those from cattle (n¿=¿9), turkeys (n¿=¿8) and humans (n¿=¿4). All pCT-like plasmids were conjugative, and most were IncK (n¿=¿21) and had the same local genetic environment flanking the blaCTX-M-14 gene (n¿=¿23). RFLP analysis demonstrated =75% similarity among most plasmids (n¿=¿22). Conclusions - pCT-like plasmids were common vectors for horizontal dissemination of 30% of the blaCTX-M-14 genes to
Original languageEnglish
Pages (from-to)1639-1644
JournalJournal of Antimicrobial Chemotherapy
Volume67
Issue number7
DOIs
Publication statusPublished - 2012

Keywords

  • spectrum-beta-lactamase
  • ctx-m
  • salmonella
  • ctx-m-14
  • enterobacteriaceae
  • resistance
  • strains
  • france
  • gene
  • uk

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