Equine Herpes Myeloencephalopathy (EHM)

Equine Herpesvirus Myeloencephalopathy is a neurological disease of horses caused by Equine Herpes Virus (EHV).  Equine herpesvirus is a common DNA virus that occurs in horse populations worldwide.  The two most common strains are EHV-1, which causes abortion, respiratory disease and neurological disease (any neurological symptoms require calling the State Veterinarian's office at 303-869-9130); and EHV-4, which usually causes respiratory disease only but can occasionally cause abortion and rarely cause neurological disease.  EHM can be very contagious, and also can have a mortality (death) rate as high as 30%.

Additional information on EHM

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