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==Introduction==

==Introduction==

EVA is caused by the [[Equine Arteritis Virus (EAV)|equine arteritis virus (EAV)]], an arterivirus with only one serotype. The virus occurs worldwide and the first outbreak in a horse in the UK occurred in 1993. No clinical outbreaks have occurred since, though infections are  occasionally detected. It can affect horses, donkeys, mules and possibly, zebras. To date there are no recorded naturally occurring clinical cases of EVA in donkeys (McCollum, 1995) despite a seroprevalence of 30% in some areas (Paweska, 1993).

EVA is caused by the [[Equine Arteritis Virus|equine arteritis virus (EAV)]], an arterivirus with only one serotype. The virus occurs worldwide and the first outbreak in a horse in the UK occurred in 1993. No clinical outbreaks have occurred since, though infections are  occasionally detected. It can affect horses, donkeys, mules and possibly, zebras. To date there are no recorded naturally occurring clinical cases of EVA in donkeys (McCollum, 1995) despite a seroprevalence of 30% in some areas (Paweska, 1993).

'''Transmission '''of infection can be''' via infected body fluids''', particularly by the '''respiratory route''', and to a lesser extent via contaminated '''fomites'''. '''Venereal spread''' by stallions is significant and similar in the donkey and

'''Transmission '''of infection can be''' via infected body fluids''', particularly by the '''respiratory route''', and to a lesser extent via contaminated '''fomites'''. '''Venereal spread''' by stallions is significant and similar in the donkey and