Global stability of a multi-group model with distributed delay and vaccination

摘要

A delayed multi-group SVEIR epidemic model with vaccination and a general incidence function has been formulated and studied in this paper. Mathematical analysis shows that the basic reproduction number R-0(vac) plays a key role in the dynamics of the model: the disease-free equilibrium is globally asymptotically stable when R-0(vac) <= 1, while the endemic equilibrium exists uniquely and is globally asymptotically stable when R-0(vac) > 1. For the proofs, we exploit a graph-theoretical approach to the method of Lyapunov functionals. Our results show that distributed delay has no impact on the global stability of equilibria, and the results improve and generalize some known results. Copyright (C) 2016 JohnWiley & Sons, Ltd.