FIG. 1.

Effect of diet on the duration cattle remained culture positive for E. coli O157:H7. Heifers were adapted to a typical forage-based growing diet (open bars) or grain-based finishing diet (shaded bars) and inoculated with a single oral dose of E. coli O157:H7. Each bar represents a single animal. The vertical line separates the animals into short-term (<19 days) (left side) and long-term (>29 days) (right side) E. coli O157:H7 culture-positive groups.