Dynamics of stochastic SIQS model based on nonlinear incidence: disease extinction and stationary distribution under degenerate diffusion

Shuantu He , Zhongyi Xiang

Electronic Research Archive ›› 2025, Vol. 33 ›› Issue (7) : 4259 -4283.

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Electronic Research Archive ›› 2025, Vol. 33 ›› Issue (7) :4259 -4283. DOI: 10.3934/era.2025193
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Dynamics of stochastic SIQS model based on nonlinear incidence: disease extinction and stationary distribution under degenerate diffusion
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Abstract

This paper investigated the dynamical behaviors of the SIQS (susceptible, infected, isolated, and again susceptible) infectious disease model with nonlinear incidence rate and degenerate diffusion in a stochastic environment. By introducing nonlinear contagion rate, the model was able to more realistically reflect the complexity of real-world disease transmission, including the effects of social behavior, medical resource constraints, and public health interventions. It was proved that the infectious disease will be extinct when Rs0 < 1. Furthermore, by utilizing Markov semigroup theory, we obtained that there existed stationary distribution for the system when Rs0 > 1. Numerical simulations were conducted by introducing three different forms of nonlinear incidence rates (standard incidence, non-monotonic incidence, Beddington-DeAngelis incidence) to verify our results.

Keywords

stochastic SIQS model / nonlinear incidence rate / degenerate diffusion / extinction / stationary distribution

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Shuantu He, Zhongyi Xiang. Dynamics of stochastic SIQS model based on nonlinear incidence: disease extinction and stationary distribution under degenerate diffusion. Electronic Research Archive, 2025, 33 (7) : 4259-4283 DOI:10.3934/era.2025193

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