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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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