Original article Global stability for a discrete SIS epidemic model with immigration of infectives

Abstract

In this paper, we propose a discrete-time SIS epidemic model which is derived from continuoustime SIS epidemic models with immigration of infectives by the backward Euler method. For the discretized model, by applying new Lyapunov function techniques, we establish the global asymptotic stability of the disease-free equilibrium for R 0 ≤ 1 and the endemic equilibrium for R 0 > 1, where R 0 is the basic reproduction number of the continuous-time model. This is just a discrete analogue of continuous SIS epidemic model with immigration of infectives