We considered a class of stochastic SIR epidemic models with saturated incidence.By using Markov semigroup theory,we proved that the system had a unique stable stationary distribution when R s0 >1.%考虑一类具饱和发生率的随机SIR传染病模型,用Markov半群理论证明了当Rs0 >1时系统有唯一稳定的平稳分布.
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