Horse Owners: EHV-1 Alert
One case of Equine Herpesvirus Myeloencephalopathy (EHM) has been confirmed by the Office of the Provincial Veterinarian in 2025. EHM is the neurological form of Equine Herpesvirus-1 (EHV-1) and is a contagious virus that can affect the brain and nerves. While this is not a new disease it MUST be reported and monitored under Alberta’s Animal Health Act.
Clinical signs of EHV-1 depend on the strain of the virus but can include:
- fever
- respiratory disease
- abortion
- death in young foals
- neurological problems
While vaccination helps reduce the risk it does not completely prevent EHV-1. It is best to talk to your veterinarian about vaccinations and to stay informed about outbreaks. An effective Biosecurity Plan is essential to prevent infectious diseases like EHM.
If you suspect EHV-1 in your herd, call your veterinarian right away. All suspected or confirmed cases must be reported to the Office of the Chief Provincial Veterinarian within 24 hours.