Dynamical analysis of an epidemic model with saturated incidence rate and vaccination
Keywords:Basic Reproduction Number, Dulacâ€™s Criterion, Epidemic Model, Lyapunov Function, Poincare- Bendixson Theorem, Vaccination.
An epidemic model with saturated incidence rate and vaccination is investigated. The model exhibits two equilibria namely disease-free and endemic equilibria. It is shown that if the basic reproduction number (R0) is less than unity, the disease-free equilibrium is locally asymptotically stable and in such case, the endemic equilibrium does not exist. Also, it is shown that if R0 > 1, the disease is persistent and the unique endemic equilibrium of the system with saturation incidence is locally asymptotically stable. Lyapunov function and Dulacâ€™s criterion plus Poincare-Bendixson theorem are applied to prove the global stability of the disease-free and endemic equilibria respectively. The effect of vaccine in the model is critically looked into.
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