Figure 2From: Modeling the spread of porcine reproductive and respiratory syndrome virus (PRRSV) in a swine population: transmission dynamics, immunity information, and optimal control strategies(a) Numbers of susceptible, infectious, and recovered swines according to time when \(R_{0}=3\); (b) A comparison of numbers of swines infected with PRRSV when \(R_{0} > 1\) and \(R_{0} < 1\)Back to article page