Serotypes and virulence gene profiles of shiga toxin-producing Escherichia coli strains isolated from feces of pasture-fed and lot-fed sheep

Applied and Environmental Microbiology
Steven P DjordjevicMichael A Hornitzky

Abstract

Shiga toxin-producing Escherichia coli (STEC) strains possessing genes for enterohemolysin (ehxA) and/or intimin (eae), referred to here as complex STEC (cSTEC), are more commonly recovered from the feces of humans with hemolytic uremic syndrome and hemorrhagic colitis than STEC strains that do not possess these accessory virulence genes. Ruminants, particularly cattle and sheep, are recognized reservoirs of STEC populations that may contaminate foods destined for human consumption. We isolated cSTEC strains from the feces of longitudinally sampled pasture-fed sheep, lot-fed sheep maintained on diets comprising various combinations of silage and grain, and sheep simultaneously grazing pastures with cattle to explore the diversity of cSTEC serotypes capable of colonizing healthy sheep. A total of 67 cSTEC serotypes were isolated, of which 21 (31.3%), mainly isolated from lambs, have not been reported. Of the total isolations, 58 (86.6%) were different from cSTEC serotypes isolated from a recent study of longitudinally sampled healthy Australian cattle (M. Hornitzky, B. A. Vanselow, K. Walker, K. A. Bettelheim, B. Corney, P. Gill, G. Bailey, and S. P. Djordjevic, Appl. Environ. Microbiol. 68:6439-6445, 2002). Our data suggest tha...Continue Reading

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Citations

Dec 22, 2005·Foodborne Pathogens and Disease·Mary MurphySéamus Fanning
Feb 18, 2005·Journal of Applied Microbiology·K A BettelheimC S McSweeney
Sep 10, 2005·Molecular and Cellular Probes·Camilla SekseYngvild Wasteson
Oct 22, 2005·International Journal of Medical Microbiology : IJMM·Stuart W NaylorJ Christopher Low
Jul 18, 2006·FEMS Microbiology Letters·Daniel R SheltonChitrita Debroy
Apr 25, 2007·Critical Reviews in Microbiology·Karl A Bettelheim
Nov 21, 2017·Journal of Food Protection·Catherine M McAuleyEdward M Fox
Jan 5, 2021·Foodborne Pathogens and Disease·Siobhán C McCarthyGeraldine Duffy

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