摘要: The ability of EIAV to persistently infect horses in the face a profound immune response by host makes it potentially devastating disease for horse population United States. Its evade defenses lying dormant apparently healthy animals and rapidly changing its antigenic determinants is proving be major obstacle vaccine development. Because most infected appear clinically normal large proportion this country remain untested, virus not likely eradicated near future. Yet, same reason, because with normal, there tendency industry become complacent efforts control virus. cooperation owners, veterinarians, regulatory officials necessary keep threat EIA check