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Advances in Continuous and Discrete Models

Theory and Modern Applications

Figure 4 | Advances in Difference Equations

Figure 4

From: Modeling the spread of porcine reproductive and respiratory syndrome virus (PRRSV) in a swine population: transmission dynamics, immunity information, and optimal control strategies

Figure 4

(a)–(c) The number of infectious swines according to time when vaccination occurs at the beginning of each time interval semiannually, annually, and biennially for \(q=0.5\), \(u=0\) for two vaccination scenarios, (A) and (B). In (d) and (e), vaccination occurs annually but the vaccination coverage is set to be 0.7 and 0.3, respectively

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