DYNAMICS OF A NONLOCAL DISPERSAL FOOT-AND-MOUTH DISEASE MODEL IN A SPATIALLY HETEROGENEOUS ENVIRONMENT

Foot-and-mouth disease is one of the major contagious zoonotic diseases in the world. It is caused by various species of the genus Aphthovirus of the family Picornavirus, and it always brings a large number of infections and heavy financial losses. The disease has become a major public health concern. In this paper, we propose a nonlocal foot-and-mouth disease model in a spatially heterogeneous environment, which couples virus-to-animals and animals-to-animals transmission pathways, and investigate the dynamics of the disperal. The basic reproduction number Script capital R-0 is defined as the spectral radius of the next generation operator Script capital R(x) by a renewal equation. The relationship between Script capital R-0 and a principal eigenvalue of an operator Script capital L-0 is built. Moreover, the proposed system exhibits threshold dynamics in terms of Script capital R-0, in the sense that Script capital R-0 determines whether or not foot-and-mouth disease invades the hosts. Through numerical simulations, we have found that increasing animals' movements is an effective control measure for preventing prevalence of the disease.