Figure 2
A flow diagram of infection categories for the adult animals in the herd. Each category (boxes) classifies animals according to their initial setup. The probabilities of exit at each time point from susceptible to latent, latent to low shedding and low shedding to high shedding animals are s1, h1, and y1, respectively. Vertical transmission probabilities from latent, low shedders and high shedders animals are Vh,Vy1, and Vy2, respectively. Horizontal transmission probabilities to calves from low shedders and high shedders animals are Hy1 and Hy2, respectively. The probability a calf is infected by colostrum/milk from infected animals is β m . Calf-to-calf and heifer-to-heifer transmission probabilities are C inf and Y inf , respectively. Stochastic death/sale probabilities for adult, calves, and heifers are µa, µc, and µh, respectively.
