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A longitudinal study of Escherichia coli O157 in fourteen cattle herds

Published online by Cambridge University Press:  01 April 1997

D. D. HANCOCK ,
T. E. BESSER ,
D. H. RICE ,
D. E. HERRIOTT  and
P. I. TARR
D. D. HANCOCK
Affiliation:
Field Disease Investigation Unit, Washington State University, Pullman, WA 99164-6610, USA
T. E. BESSER
Affiliation:
Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040, USA
D. H. RICE
Affiliation:
Field Disease Investigation Unit, Washington State University, Pullman, WA 99164-6610, USA
D. E. HERRIOTT
Affiliation:
United States Department of Agriculture: Animal and Plant Health Inspection Services: Veterinary Services, Salem OR 97301, USA
P. I. TARR
Affiliation:
Children's Hospital and Medical Center, University of Washington, Seattle, WA 98105, USA
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Abstract

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Escherichia coli O157 shedding in 14 cattle herds was determined by faecal culture at intervals of approximately 1 month for up to 13 months. The overall prevalence was 1·0% (113/10832 faecal samples) and 9 of the 14 herds were detected as positive. Herds positive 2 years previously (n=5) had a higher prevalence of positive cattle (median=1·9%) than herds which had been negative on a previous sampling (n=8, median=0·2%). Weaned heifers had a higher prevalence (1·8%) than did unweaned calves (0·9%) or adults (0·4%). For all herds the highest prevalence occurred in the summer months, which resulted in most of the positive faecal samples being collected on a minority of sampling visits.

Type
Research Article
Information
Epidemiology & Infection , Volume 118 , Issue 2 , April 1997 , pp. 193 - 195
Copyright
© 1997 Cambridge University Press