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Volume 56, Issue 11

Influence of geographical origin, host animal and gene on the virulence characteristics of O26 strains Free

Abstract

The influence of geographical origin, host animal and presence of the gene on the virulence of O26 strains from ruminants was determined in this study. A clear association was found between the virulence profile and geographical origin of Shiga-toxigenic (STEC) O26 strains, with UK STEC O26 strains harbouring virtually identical profiles, whilst central European strains showed considerable heterogeneity in plasmid-encoded genes. The former group were also more likely to be non-motile and gene positive. Comparison of UK STEC and atypical enteropathogenic (aEPEC) O26 strains showed that the presence of the gene was positively correlated with the presence of and genes and negatively associated with the presence of the – region and with rhamnose fermentation. In contrast to the uniform profiles of STEC O26 strains from ruminants in the UK, aEPEC O26 strains of bovine and ovine origin showed diverse profiles both within and between groups, and could not be separated into discrete groups. These results indicate that the characteristics of UK O26 strains from ruminants are distinct from those of O26 strains from ruminants and humans in other regions in central Europe. Such differences are expected to influence the zoonotic potential of this pathogen and the subsequent incidence of O26-associated human disease.

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Keyword(s): aEPEC, atypical enteropathogenic E. coli , EHEC, enterohaemorrhagic E. coli , HPI, high-pathogenicity island , HUS, haemolytic uraemic syndrome , STEC, Shiga toxin-producing E. coli and Stx, Shiga toxin
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2007-11-01
2024-04-23
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Influence of geographical origin, host animal and stx gene on the virulence characteristics of Escherichia coli O26 strains
J. Med. Microbiol. 56, 1431 (2007); https://doi.org/10.1099/jmm.0.47311-0
/content/journal/jmm/10.1099/jmm.0.47311-0
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