一类具有非线性传染率和生育脉冲的随机SIS传染病模型的动力学分析

Dynamics Analysis of a Stochastic SIS Epidemic Model with Nonlinear Incidence and Birth Pulses

研究了一类具有非线性传染率、生育脉冲和随机干扰的SIS传染病模型.通过建立Lyapunov函数证明了全局正解的存在唯一性,研究疾病是否消亡,得到了疾病灭绝的充分条件,利用随机非线性理论中Lyapunov指数,得到无病解随机指数渐近稳定的充分条件.

A stochastic SIS epidemic model with nonlinear incidence and birth pulses is investigated in this paper. The existence and uniqueness of the global positive solution are proved by establishing Lyapunov function. The sufficient condition for stochastic extinction of the infection is gained. The sufficient condition for the stochastically exponentially asymptotically stability of infection-free solution is gained by using the Lyapunov exponents.