Figure 2

Percentage fecal culture-positive calves in the 2 dose groups for every month after inoculation. A) calves inoculated at 2 weeks or 3 months of age, and B) calves inoculated at 6, 9 or 12 months of age. Solid dark bars represent calves inoculated with a high dose of MAP and open white bars represent calves inoculated with a low dose of MAP. Note: the number of calves used to calculate this proportion decreases as the time after inoculation increases (calves inoculated at 2 weeks or 3, 6, 9 or 12 months were followed for 17, 14, 11, 8 and 5 months after inoculation, respectively).