Equine viral arteritis (EVA) is a disease of horses caused by an
RNA virus of the genus
Arterivirus. The virus which causes EVA was first isolated from horses in
Ohio in 1953 but the disease has afflicted equine animals worldwide for centuries. It has been more common in some breeds of horses in the
United States, but there is no breed “immunity”. In the
UK, it is a
notifiable disease. There is no known human hazard.