Abstract
A stochastic two-group SIR model is presented in this paper. The existence and uniqueness of its nonnegative solution is obtained, and the solution belongs to a positively invariant set. Furthermore, the globally asymptotical stability of the disease-free equilibrium is deduced by the stochastic Lyapunov functional method if R 0 ≤ 1, which means the disease will die out. While if R 0 > 1, we show that the solution is fluctuating around a point which is the endemic equilibrium of the deterministic model in time average. In addition, the intensity of the fluctuation is proportional to the intensity of the white noise. When the white noise is small, we consider the disease will prevail. At last, we illustrate the dynamic behavior of the model and their approximations via a range of numerical experiments.
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Supported by National Natural Science Foundation of China (Grant No. 10971021), the Ministry of Education of China (Grant No. 109051), the Ph.D. Programs Foundation of Ministry of China (Grant No. 200918) and the Graduate Innovative Research Project of NENU (Grant No. 09SSXT117)
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Ji, C.Y., Jiang, D.Q. & Shi, N.Z. Two-group SIR epidemic model with stochastic perturbation. Acta. Math. Sin.-English Ser. 28, 2545–2560 (2012). https://doi.org/10.1007/s10114-012-9668-3
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DOI: https://doi.org/10.1007/s10114-012-9668-3
Keywords
- Stochastic two-group SIR model
- disease-free equilibrium
- endemic equilibrium
- stochastic Lyapunov function
- asymptotically stable in the large