Dynamics of a stochastic SIRS epidemic model with standard incidence and vaccination
Tingting Xue1, Xiaolin Fan1, Zhiguo Chang2
1School of Mathematics and Physics, Xinjiang Institute of Engineering, Urumqi, Xinjiang, China.
Abstract:
A stochastic SIRS epidemic model with vaccination is discussed. A new stochastic threshold $ R_0^s $ is determined. When the noise is very low ($ R_0^s < 1 $), the disease becomes extinct, and if $ R_0^s > 1 $, the disease persists. Furthermore, we show that the solution of the stochastic model oscillates around the endemic equilibrium point and the intensity of the fluctuation is proportional to the intensity of the white noise. Computer simulations are used to support our findings.
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