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• W4288063763 abstract "<abstract><p>Infectious diseases have a great impact on the economy and society. Dynamic models of infectious diseases are an effective tool for revealing the laws of disease transmission. Quarantine and nonlinear innate immunity are the crucial factors in the control of infectious diseases. Currently, there no mathematical models that comprehensively study the effect of both innate immunity and quarantine. In this paper, we propose and analyze an SEIQR epidemic model with nonlinear innate immunity. The boundedness and positivity of the solutions are discussed. Employing the next-generation matrix, we compute the expression of the basic reproduction number. Under certain conditions, the phenomenon of backward bifurcation may occur. That is to say, the stable disease-free equilibrium point and the stable endemic equilibrium point coexist when the basic reproduction ratio is less than one. And the basic reproduction number is no longer the threshold value to determine whether the disease breaks out. We investigate the globally asymptotical stability of the disease-free equilibrium point for the system by constructing Lyapunov function. Also, we research the global stability of the endemic equilibrium by using geometric approach. Numerical simulations are carried out to reveal the theoretical results and find some complex dynamics (for example, the existence of Hopf bifurcation) of the system. Both theoretical and numerical results indicate that the nonlinear innate immunity may cause backward bifurcation and Hopf bifurcation, which makes more difficult to eliminate the disease.</p></abstract>" @default.
• W4288063763 created "2022-07-28" @default.
• W4288063763 creator A5014828416 @default.
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• W4288063763 date "2022-01-01" @default.
• W4288063763 modified "2023-10-01" @default.
• W4288063763 title "Stability analysis and backward bifurcation on an SEIQR epidemic model with nonlinear innate immunity" @default.
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• W4288063763 doi "https://doi.org/10.3934/era.2022178" @default.
• W4288063763 hasPublicationYear "2022" @default.
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