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Journal of Clinical Microbiology, Feb 1996, 431-433, Vol 34, No. 2
Copyright © 1996 by the American Society for Microbiology. All rights reserved.

Escherichia coli O157:H7 in microbial flora of sheep

IT Kudva, PG Hatfield and CJ Hovde
Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow 83843, USA.

We found naturally occurring, potentially virulent Escherichia coli O157:H7 strains in sheep. The incidence of E. coli O157:H7 was transient and ranged from 31% of sheep in June to none in November. The use of a sensitive culture technique and the choice of the proper sampling season were both essential for detecting this bacterium in sheep. DNA hybridizations showed that 80% of the E. coli O157:H7 isolates had at least two of the Shiga-like toxin types I or II or the attaching-effacing lesion genes.


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