Threshold dynamics of a periodic SIR model with delay in an infected compartment

Abstract

Threshold dynamics of epidemic models in periodic environmentsattract more attention. But there are few papers which are concernedwith the case where the infected compartments satisfy a delaydifferential equation. For this reason, we investigate the dynamicalbehavior of a periodic SIR model with delay in an infectedcompartment. We first introduce the basic reproduction number$\mathcal {R}_0$ for the model, and then show that it can act as athreshold parameter that determines the uniform persistence orextinction of the disease. Numerical simulations are performed toconfirm the analytical results and illustrate the dependence of$\mathcal {R}_0$ on the seasonality and the latent period.

Keywords

• periodicsolution.
• basic reproduction number
• delay
• threshold dynamics