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Influence of feeding regimes on acidadaptation & resistance in E. coli O157:H7• Cattle fed grain had more acid resistant E. colithan animals fed hay (Diez-Gonzalez & Russell,1998)• Cattle fed grain or hay had equal numbers of acidresistant E. coli (Hovde et al., 1999)
Acid adaptation in the live animal• Acid adaptation has not been shown to beassociated with a particular system in the liveanimal• It is likely that acid adaptation results from anoverlapping between different systems
Page 4 and 5: Bovine GI tractpH (6.0-7.0)pH (2.0-
Page 7: Pathogen survival in the GI tract
Page 11: Survival in the abomasum• Cells e
Page 15 and 16: Stresses which occur in foods & in
Page 17 and 18: Leyer and Johnson, 1992The influenc
Page 19 and 20: Pathogen replication in Acanthamoeb
Page 21 and 22: Pathogen survival in protozoa• En
Page 23 and 24: E. coli O157:H7 producing vesicles

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