Traveling wave solutions in a two-group SIR epidemic model with constant recruitment

Host heterogeneity can be modeled by using multi-group structures in the population. In this paper we investigate the existence and nonexistence of traveling waves of a two-group SIR epidemic model with time delay and constant recruitment and show that the existence of traveling waves is determined by the basic reproduction number there exists a minimal wave speed such that for each there exists no nontrivial traveling wave satisfying the system; (ii) when the system admits no nontrivial traveling waves. Finally, we present some numerical simulations to show the existence of traveling waves of the system.