Effect of dietary stress on fecal shedding of Escherichia coli O157:H7 in calves.
Two groups of calves were subjected to dietary stress by withholding of food beginning 1 or 14 days after inoculation with 10(10) 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 10(7) 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.
Cray
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National Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Ames, Iowa 50010, USA.
Casey
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TA
Bosworth
B T
BT
Rasmussen
M A
MA
D000818:Animals; D002417:Cattle / Q000382:microbiology*; D019453:Escherichia coli O157 / Q000302:isolation & purification*; D005215:Fasting; D005243:Feces / Q000382:microbiology*