Abstract
In this paper, an SEIV epidemic model with vaccination and nonlinear incidence rate is formulated. The analysis of the model is presented in terms of the basic reproduction number R0. It is shown that the model has multiple equilibria and using the center manifold theory, the model exhibits the phenomenon of backward bifurcation where a stable disease-free equilibrium coexists with a stable endemic equilibrium for a certain defined range of R0. We also discuss the global stability of the endemic equilibrium by using a generalization of the Poincare–Bendixson criterion. Numerical simulations are presented to illustrate the results.
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