Extinction and Ergodic Property of Stochastic SIS Epidemic Model with Nonlinear Incidence Rate

Figure 1

The solution 𝐼(𝑡) of SIS model (7) compared to the deterministic system with different initial value 𝐼(0)=1.8 and 0.4, 𝜎=0.6. The blue line represents the solution of stochastic system, and the black line represents the solution of the corresponding deterministic system.

(a)

(b)