Document Type: Regular Paper
Department of Mathematical Sciences, Sharif University of Technology,
P.O. Box 11155-9415, Tehran, Iran
School of Mathematics, Institute for Research in Fundamental Sciences (IPM)
This paper is concerned with global analysis of a delay SVEIR epidemiological model in a population of varying size. By using Lyapunov stability method and LaSalle’s invariance principle for delay systems, we prove that when there is no endemic equilibrium, the disease free equilibrium is globally asymptotically stable, otherwise the endemic equilibrium is globally stable.