EQUINE Viral Arteritis (EVA) is a contagious viral disease of horses caused by the Equine Arteritis Virus (EAV) that occurs worldwide.

In Ireland, the last recorded outbreak occurred in 2010. In April and May 2019, the UK authorities reported the identification of four EAV infected carrier stallions, occurring in non-thoroughbred animals on closely linked premises in Dorset and Devon. In July 2019, a further unrelated outbreak of the disease was confirmed in a fifth non-thoroughbred stallion in Shropshire, who was subsequently castrated.