Abstract: We formulate a delayed SIS model to describe the effect of transport-related infec-tion. The basic reproduction number is obtained. By the linearization method and comparison principle, it is proved that the disease-free equilibrium is globally asymptotically stable and the disease always dies out if the basic reproduction number is less than unity. While there exists a unique endemic equilibrium which is globally attractive and the disease persists if the basic reproduction number is greater than unity. The simulation results show the influence of travel rates on the disease spread. The dependence of the basic reproduction number on the travel rates during travel is also analyzed.

Key words: transport-related infection, basic reproduction number, uniform persistence, global dynamics, time delay