Equine Herpesvirus 1 & 4

Equine herpesviruses are very common DNA viruses in horse populations worldwide. The two most significant are EHV-1, which causes respiratory disease, abortion, and neurologic disease; and EHV-4, which primarily causes respiratory disease and only occasionally causes abortion or neurologic disease. Fatal neonatal disease infrequently occurs as a result of in utero infection. Asymptomatic infection is common and facilitates transmission within groups of horses.