Figure 2From: Extinction and persistence of a stochastic SIRV epidemic model with nonlinear incidence rateSimulation for paths \(S(t)\), \(I(t)\), \(R(t)\), and \(V(t)\) for the stochastic system with initial value \((S(0),I(0),R(0),V(0))=(0.5,0.06,0.5,0.5)\) for different noise intensities \(\sigma =1.15\) (a) and \(\sigma =0.9\) (b)Back to article page