Fluoroquinolone-resistant extraintestinal Escherichia coli clinical isolates representing the O15: K52: H1 clonal group from humans and dogs in Australia

Joanne L. Platell, Rowland N. Cobbold, James R Johnson, Connie R. Clabots, Darren J. Trott

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Antimicrobial-resistant extraintestinal pathogenic Escherichia coli (ExPEC) impact both human and veterinary medicine. One ExPEC clonal group that has become increasingly multidrug-resistant is serotype O15:K52:H1. Accordingly, we sought O15:K52:H1 strains among fluoroquinolone-resistant (FQr) E. coli clinical isolates from humans (n=582) and dogs (n=120) in Australia. The phylogenetic group D isolates (267/702; 38%) were screened for O15:K52:H1-specific single-nucleotide polymorphisms (SNPs) in fumC and the O15 rfb variant. The 34 so-identified O15:K52:H1 isolates (33 human, 1 canine) underwent antimicrobial susceptibility profiling, virulence genotyping, and macrorestriction profiling. Although susceptibility profiles varied, the 34 isolates were closely related by pulsed-field gel electrophoresis and exhibited typical O15:K52:H1-associated virulence profiles (complete pap operon, F16 papA allele, papG allele II, iha, fimH, sat, fyuA, iutA, kpsMII, ompT). The canine isolate closely resembled human isolates. Thus, O15:K52:H1 strains contribute to the FQr ExPEC population in Australia and may potentially be transferred between humans and dogs.

Original languageEnglish (US)
Pages (from-to)319-324
Number of pages6
JournalComparative Immunology, Microbiology and Infectious Diseases
Volume35
Issue number4
DOIs
StatePublished - Jul 1 2012

Keywords

  • Clonal group O15:K52:H1
  • Dogs
  • Extraintestinal pathogenic Escherichia coli
  • Fluoroquinolone resistance

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