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Stability of a delayed SIRS epidemic model with a nonlinear incidence rate. (English) Zbl 1198.34098
Summary: An SIRS epidemic model with a nonlinear incidence rate and a time delay is investigated. By analyzing the corresponding characteristic equations, the local stability of an endemic equilibrium and a disease-free equilibrium is discussed. By comparison arguments, it is proved that if the basic reproductive number $R_{0}<1$, the disease-free equilibrium is globally asymptotically stable. If $R_{0}>1$, by means of an iteration technique, sufficient conditions are derived for the global asymptotic stability of the endemic equilibrium. Editorial remark: There are doubts about a proper peer-reviewing procedure of this journal. The editor-in-chief has retired, but, according to a statement of the publisher, articles accepted under his guidance are published without additional control.

##### MSC:
 34D23 Global stability of ODE 92D30 Epidemiology 34K20 Stability theory of functional-differential equations 34K60 Qualitative investigation and simulation of models
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##### References:
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