Figure 2.

Mechanism by which feed ingredients may serve as transboundary vectors of swine viral diseases. Risky agricultural practices, such as drying grains on roadways, may contaminate feed ingredients in countries with circulating foreign animal diseases. Trucks carrying pigs may drive over areas where feed ingredients are drying, transferring viruses through pig excretions and secretions. Feed ingredients are transported in shipping containers across transoceanic conditions to arrive in the importing country. Trucks transport the feed ingredients on interstate highways to feed mills, where they are incorporated into a complete feed diet. Feed mills widely distribute feed to swine farms for pigs’ consumption and growth.