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Figure 1 | BMC Veterinary Research

Figure 1

From: Invasion and transmission of Salmonella Kentucky in an adult dairy herd using approximate Bayesian computation

Figure 1

Flow diagram of the susceptible-infectious-recovered-susceptible (SIRS) model describing the transmission dynamics of Salmonella Kentucky in an adult dairy herd. Susceptible animals (S) were infected at rate β I / N and became infectious (shedding, I). After remaining infectious a certain amount of time upon infection, the length of which was assumed to follow a gamma distribution described by the rate (γ) and shape (n) parameters, infectious animals became recovered animals (R), with fully established infection-induced immunity. The recovered animals (R) lost their immunity at rate (ϕ) and became susceptible again. To maintain the herd size (N), the replacement rate (μ) of animals coming into the herd was assumed to be the same as the general removal rate (μ) of animals from the herd.

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