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Applied and Environmental Microbiology, July 1999, p. 3233-3235, Vol. 65, No. 7
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Effect of Cattle Diet on Escherichia coli O157:H7 Acid Resistance

Carolyn J. Hovde,1,* Paula R. Austin,1 Karen A. Cloud,1 Christopher J. Williams,2 and Carl W. Hunt3

Department of Microbiology, Molecular Biology, and Biochemistry,1 Division of Statistics,2 and Department of Animal Veterinary Science,3 University of Idaho, Moscow, Idaho 83844

Received 10 February 1999/Accepted 6 April 1999

The duration of shedding of Escherichia coli O157 isolates by hay-fed and grain-fed steers experimentally inoculated with E. coli O157:H7 was compared, as well as the acid resistance of the bacteria. The hay-fed animals shed E. coli O157 longer than the grain-fed animals, and irrespective of diet, these bacteria were equally acid resistant. Feeding cattle hay may increase human infections with E. coli O157:H7.

* Corresponding author. Mailing address: Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844. Phone: (208) 885-5906. Fax: (208) 885-6518. E-mail: cbohach{at}uidaho.edu.

Applied and Environmental Microbiology, July 1999, p. 3233-3235, Vol. 65, No. 7
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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Copyright © 1999 by the American Society for Microbiology. All rights reserved.