Survival of Escherichia coli O157:H7 in feces from corn- and barley-fed steers.

摘要: The survival of Escherichia coli O157:H7 in feces from steers fed corn (CO) or barley (BA) was evaluated at -10, +4 and +22 degrees C. Fecal pats were inoculated with a four-strain mixture nalidixic-acid resistant E. two levels: 10(3) CFU g(-1) (low, L) 105 (high, H). At -10 C, duration reduced (p 0.05) observed the rate decline among treatments. Survival twice as likely < 22 C than 4 While pH dry matter content increased, volatile fatty acid concentrations decreased over 84 days all three temperatures, these changes most pronounced for extended periods time both corn- barley-fed animals demonstrated, thus fecal material may serve vector transmission organism. greater suggests that temperature play role seasonality prevalence this bacterium feedlot cattle. reported cattle compared to those does not appear be related elevated risk arising differential feces.