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Figure 2 | Veterinary Research

Figure 2

From: Modelling the spread of bovine viral diarrhea virus (BVDV) in a beef cattle herd and its impact on herd productivity

Figure 2

Diagram of the transitions between health states. S: susceptible; T: transiently-infected; P: persistently infected; M: protected by maternal antibodies; R: immune; R a , R b , R c : immune which have been infected in early, mid and late pregnancy, respectively. Dotted lines concern only calves. The values of the transition rates ϕ MS and ϕ TR are given in Table 1. The value of the transition rate f is derived from eq. 1 and eq. 2.

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