Epidemiology of African swine fever

In Africa and Spain, several ticks are the storage hosts and vectors of ASFV. Many other ticks widely distributed in America and other places can also spread ASFV. It is generally believed that the introduction of ASFV into epidemic-free areas is related to undercooked infected pig products or leftovers from international airports and ports, or it is caused by contact with pollutants, fetuses, feces, diseased pig tissues and feeding contaminated feed.