Abstract
The aim of this paper is to study the stochastic SIR equation with general incidence functional responses and in which both natural death rates and the incidence rate are perturbed by white noises. We derive a sufficient and almost necessary condition for the extinction and permanence for SIR epidemic system with multi noises{dS(t)=[a1−b1S(t)−I(t)f(S(t),I(t))]dt+σ1S(t)dB1(t)−I(t)g(S(t),I(t))dB3(t),dI(t)=[−b2I(t)+I(t)f(S(t),I(t))]dt+σ2I(t)dB2(t)+I(t)g(S(t),I(t))dB3(t). Moreover, the rate of all convergences of the solution are also established. A number of numerical examples are given to illustrate our results.
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