文摘
Stochastic multi-group epidemic models with distributed delays are studied. We show that there is a unique global positive solution as desired in any population dynamics. We show that if R0≤1R0≤1, the solution of the stochastic system oscillates around E0E0. We prove that if R0>1R0>1, the solution of the stochastic model fluctuates around E∗E∗.