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Equine Herpes Virus

What is Equine Herpes Virus?

Equine herpes virus (EHV) is found in horse populations worldwide.1 There are different strains of the virus, the most common being EHV-1 and EHV-4.1

EHV-1 can cause respiratory diseases, especially in young horses, neurological diseases, and abortion.1 EHV-4 causes respiratory disease and may cause abortion in some mares.EHV can persist in the horse with reactivation and shedding of virus occurring during periods of stress.


  1. Queensland Horse Council Inc. Equine Herpes Virus Fact Sheet, March 2009