Stationary distribution and extinction of a stochastic SIRS epidemic model with information intervention

In this paper, a new SIRS epidemic model which considers the influence of information intervention and environmental noise is studied. The study shows that information intervention and white noise have great effects on the disease. First, we show that there is global existence and positivity of the solution. Then, we prove that the stochastic basic productionRs is a threshold which determines the extinction or persistence of the disease. When the intensity of noise is large, we obtainRs < 1 and the disease will die out. When the intensity of noise is small, thenRs > 1 and a sufficient condition for the existence of stationary distribution is obtained, which means the disease is prevalent. Finally, the main results are illustrated by numerical simulations.