• Coastal Equine

EHV v. EHM - What's the Difference?

Updated: Aug 12

Equine Herpesvirus (EHV)

  • EHV is a common virus in the horse population and has several genetic strains.

  • Common strains, EHV-1 and EHV-4, cause a mild respiratory disease.

  • In most cases, horses recover from the virus within a few weeks.

  • Vaccinations are available to prevent the respiratory disease and abortion caused by EHV-1 and EHV-4.

Equine Herpesvirus Myeloencephalopathy (EHM)

  • EHM is a neurologic disease that can develop, in rare cases, in a horse infected by EHC.

  • EHM is usually caused by the EHV-1 virus. In extremely rare cases, EHV-4 can develop into EHM.

  • There is no cure or vaccination for EHM and prognosis for horses who test positive for EHV and develop neurologic signs of EHM can be poor.


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