Traveling waves for a nonlocal dispersal SIR model with delay and external supplies

This paper is concerned with the existence, nonexistence and minimal wave speed of traveling waves of a nonlocal dispersal delayed SIR model with constant external supplies and Holling-II incidence rate. We find that the existence and nonexistence of traveling waves of the system are not only determined by the minimal wave speed c*, but also by the so-called basic reproduction number R-0 of the corresponding reaction system. That is, we establish the existence of traveling waves for R-0 > 1 and each wave speed c >= c*, and the nonexistence for R-0 > 1 and any 0 < c < c* or R-0 < 1. We also discuss how the latency of infection and the spatial movement of the infective individuals affect the minimal wave speed. Biologically speaking, the longer the latency of infection in a vector is, the slower the disease spreads. (C) 2014 Elsevier Inc. All rights reserved.