Figure 2

Shows numerical simulations of stochastic model (2) when \({\mathcal{R}}_{0}^{s}=1.3>1\), with \(\eta =0.09\), \(\xi =1.3\), \(\beta =0.05\), \(\sigma =0.9\), \(\alpha =0.36\), \(\gamma =0.1\); \(\tau =1\) and white noises \(\nu _{1}=0.1\), \(\nu _{2}=0.09\), \(\nu _{3}=0.09\), \(\nu _{4}=0.07\). The model has a unique ergodic stationary distribution and the infection is persistent