Equine herpesvirus 1 and 4 (EHV-1 and EHV-4) are important pathogens responsible for considerable economic losses in the horse industry. Differentiation between these 2 viruses using conventional serological methods with polyclonal antisera has been difficult. Biological differences have, however, been recognised for a long time. Both EHV-1 and EHV-4 are associated with upper respiratory disease, but disseminated infection with EHV-1 can result in neurological disorders or abortion in susceptible mares.
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