Occurrence of non-sorbitol fermenting, verocytotoxin-lacking Escherichia coli O157 on cattle farms

Katrijn Cobbaut, Kurt Houf, Glenn Buvens, Ihab Habib, Lieven De Zutter

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Escherichia coli O157 is often associated with hemorrhagic colitis and the hemolytic uremic syndrome (HUS). The verocytotoxins are considered to be the major virulence determinants. However, vt-negative E. coli O157 were recently isolated from patients with HUS. Several transmission routes to humans are described, but cattle feces are the primary source from which both the food supply and the environment become contaminated with E. coli O157. In a prevalence study performed on dairy, beef, mixed dairy/beef and veal farms in the summer of 2007, vt-negative isolates were detected on 11.8% (8/68) of the positive farms. From these eight farms, a total of 43 sorbitol-negative E. coli O157:H7 were collected. On five farms, only strains negative for the vt genes were present whereas both vt-negative and vt-positive strains could be detected on three other farms. Further characterization revealed that all isolates carried the eaeA and hlyA genes. Pulsed-field gel electrophoresis (PFGE) of all isolates resulted in nine different PFGE types and within the vt-negative strains, four different genotypes were identified, indicating that certain genetic clones are widespread over the cattle population.

Original languageEnglish
Pages (from-to)174-178
Number of pages5
JournalVeterinary Microbiology
Issue number1-2
Publication statusPublished - Jul 2 2009
Externally publishedYes


  • Cattle
  • E. coli O157
  • Verocytotoxin-negative

ASJC Scopus subject areas

  • Microbiology
  • General Veterinary


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