Fig. 2.

Corresponding simulation of partial compartments $S\left(t\right)$ and $I\left(t\right)$ of stochastic system (1.3) under noise intensities $({\sigma }_1,{\sigma }_2,{\sigma }_3)=(0.0008,0.0004,0.0008),(0.008,0.0004,0.0008),(0.0008,0.004,0.0008)$ and $(0.0008,0.0004,0.008),$ respectively. Other fixed parameters: $(\Lambda ,\beta ,\mu ,\alpha ,\delta ,\gamma ,\vartheta )=(0.8,0.4,3\times {10}^{-5},0.00457,0.05,0.2,0.4)$.