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Stationary distribution of a stochastic generalized SIRI epidemic model with reinfection and relapse

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  • Wang, Kai
  • Fan, Hongjie
  • Zhu, Yanling

Abstract

In this paper, we propose and investigate the stochastic SIRI epidemic model with two generalized incidence rate functions. We firstly study the existence and uniqueness of the globally positive solution to the stochastic SIRI model with positive initial value. Then we obtain sufficient conditions for the extinction of the disease in the stochastic epidemic model, and find that the large noise can make the disease die out exponentially. Meanwhile, we obtain that the solution to the stochastic model has a unique stationary distribution when R0s˜ is greater than one. Our results show that the intensity of white noise can affect the dynamical behaviors of the model. Finally, we use numerical simulation to illustrate theoretical results, and apply both the stochastic and deterministic models to analyze the outbreak of COVID-19 epidemic in Serbia.

Suggested Citation

  • Wang, Kai & Fan, Hongjie & Zhu, Yanling, 2025. "Stationary distribution of a stochastic generalized SIRI epidemic model with reinfection and relapse," Statistics & Probability Letters, Elsevier, vol. 216(C).
    • Handle: RePEc:eee:stapro:v:216:y:2025:i:c:s0167715224002487
    DOI: 10.1016/j.spl.2024.110279
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    References listed on IDEAS

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