Nilubol et al. (2012) report that, the management of herd outbreak in Thailand, unlike management in the United States, the owners of several of the pigs farm had been loaded on of dead pigs from herds in outbreak areas by trucks hauling are not composted, buried, or incinerated; instead, they are sold to feed catfish. Truckers associated with this trade visit pig farms to buy and transport dead pigs. These trucks are not washed, so they are a potential source of contamination on farms.