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Appl Environ Microbiol, May 1998, p. 1975-1979, Vol. 64, No. 5
0099-2240/98/$00.00+0

Effect of Dietary Stress on Fecal Shedding of Escherichia coli O157:H7 in Calves

William C. Cray Jr., Thomas A. Casey,* Brad T. Bosworth, and Mark A. Rasmussen

National Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Ames, Iowa 50010

Received 2 June 1997/Accepted 8 March 1998

Two groups of calves were subjected to dietary stress by withholding of food beginning 1 or 14 days after inoculation with 1010 CFU of Escherichia coli O157:H7. Following treatment, neither group had a significant increase in fecal shedding of E. coli O157:H7. A third group of calves had food withheld for 48 h prior to inoculation with 107 CFU of E. coli O157:H7. These calves were more susceptible to infection and shed significantly more E. coli O157:H7 organisms than calves maintained on a normal diet.

* Corresponding author. Mailing address: Enteric Diseases and Food Safety Research Unit, USDA-ARS, National Animal Disease Center, 2300 Dayton Ave., Ames, IA 50010. Phone: (515) 239-8376. Fax: (515) 239-8458. E-mail: tcasey{at}nadc.ars.usda.gov.

Appl Environ Microbiol, May 1998, p. 1975-1979, Vol. 64, No. 5
0099-2240/98/$00.00+0


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