Once introduced in a village by a trader, avian influenza virus may spread in the village’s poultry population and jump later to a distant group of villages through the visit of another trader, especially if it is a TT. The 5-km radius of poultry movement control, which was implemented by Thai authorities at the beginning of HPAI H5N1 outbreaks (Tiensin et al., 2005), may have contributed to successfully controlling disease spread by limiting local movements.