There are three main types of herpes virus in horses:
Equine herpesvirus 1 (EHV-1); which causes respiratory disease and also occasionally abortions and neurological disease.
Equine herpesvirus 4 (EHV-4); causes respiratory disease (generally mild).
Equine herpesvirus 3 (EHV-3); which is less commonly seen but may cause venereal disease in breeding mares and stallions.
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