Asymptotic profiles of the endemic equilibrium of a diffusive SIS epidemic system with saturated incidence rate and spontaneous infection. (23rd July 2020)

• Record Type: Journal Article
• Authors: Zhang, Jialiang; Cui, Renhao
• Is Part Of: Mathematical methods in the applied sciences. Volume 44:Number 1(2021)
• Page Start: 517
• Page End: 532
• Publication Date: 2020-07-23
• Subjects: asymptotic profile -- endemic equilibrium -- saturated incidence rate -- SIS epidemic model -- small/large diffusion -- spontaneous infection; Mathematics -- Periodicals; Technology -- Mathematics -- Periodicals; 519
• DOI: 10.1002/mma.6754
• Languages: English
• ISSNs: 0170-4214

Abstract

Abstract : A susceptible‐infected‐susceptible (SIS) epidemic reaction‐diffusion model with saturated incidence rate and spontaneous infection is considered. We establish the existence of endemic equilibrium by using a fixed‐point theorem. The global asymptotic stability of the constant endemic equilibrium is discussed in the case of homogeneous environment. We mainly investigate the effects of diffusion and saturation on asymptotic profiles of the endemic equilibrium. When the saturated incidence rate tends to infinity, the susceptible and infective distributes in the habitat in a nonhomogeneous way; this result is in strong contrast with the case of no spontaneous infection, where the endemic equilibrium tends to the disease free equilibrium. Our analysis shows that the spontaneous infection can enhance the persistence of an infectious disease and may provide some useful implications on disease control.