Journal article
Characterisation and clonal relationships of Shiga-toxigenic Escherichia coli (STEC) isolated from Australian dairy cattle
Veterinary microbiology, Vol.79(4), pp.323-335
2001
Handle:
https://hdl.handle.net/2376/110754
PMID: 11267792
Abstract
A total of 136 Shiga toxin-producing
Escherichia coli (STEC) isolated during a longitudinal survey of three Australian dairy farms were examined to determine their virulence factors, serotype and genomic relationships. This study aimed to assess the potential of these STEC to cause disease in humans and to analyse the on-farm ecology of STEC. Virulence factors (
stx,
eae,
ehxA) were used as determinants of potential to be enterohaemorrhagic
E. coli (EHEC) and were examined using polymerase chain reaction (PCR). Among the cattle groups tested, calves, both before and during weaning, shed the most putative EHEC and were the main source of serotypes commonly associated with human disease.
E. coli O157:H7 and
E. coli O26:H11 represented 9.4 and 7.8% of cattle STEC isolates respectively, with other putative EHEC serotypes reported for the first time from cattle. Based on serotype and virulence factors, 20% of STEC were putative EHEC. Pulsed-field gel electrophoresis (PFGE) was used to compare the genomic profiles of STEC from dairy farms. Isolates common to cattle and the farm environment were identified. Multiple strains of STEC with high clonal turnover were detected in the faeces of cattle, and isolates appeared to be specific to individual farms. To fully assess the pre-slaughter EHEC risk factors on-farm, examination of STEC virulence is as important as determination of STEC prevalence.
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Details
- Title
- Characterisation and clonal relationships of Shiga-toxigenic Escherichia coli (STEC) isolated from Australian dairy cattle
- Creators
- Rowland Cobbold - Department of Microbiology and Parasitology, University of Queensland, St. Lucia, Qld 4072, AustraliaPatricia Desmarchelier - Food Science Australia, PO Box 3312, Tingalpa DC, Qld 4173, Australia
- Publication Details
- Veterinary microbiology, Vol.79(4), pp.323-335
- Publisher
- Elsevier B.V
- Identifiers
- 99900547269301842
- Language
- English
- Resource Type
- Journal article