11/19/2025
FYI ...
As many of you may be aware, a positive case of Equine Herpes Virus 1 (EHV1) Equine Herpes Myeloencephalopathy (EHM) has been identified in Red Deer, Alberta as well as in the southern USA. It is important to note that the virus has not been reported in Saskatchewan and the positive case in Alberta has been quarantined.
EHV-1 is a common equine virus that typically causes respiratory signs in horses through nose to nose contact and sharing halters, brushes, buckets, etc.
We typically recommend vaccinating horses for EHV1 at least annually, often boostering it a second time for horses at higher risk (busy boarding barns, training, showing). The neurological form of the disease does occur every few years and the effects can be devastating.
There is not currently a vaccine against the neurological form (EHM) and treatment for the viral infection consists of supportive care and medical management until the horse’s immune system is able to clear the virus. Sadly, this virus can be fatal in some cases or result in long lasting neurological deficits. It is a highly contagious virus and is easily transmitted between horses.
Vaccinating for EHV1 may decrease viral shedding risk and symptoms if the horse were to contract EHM.
Biosecurity is of utmost importance in these times in order to prevent your horse from coming into contact with carrier or infected horses. Horses travelling to affected areas, or anywhere for that matter, should be carefully monitored and isolated upon returning to their home property.
Important biosecurity protocols to implement:
✔️Limit horse-to-horse contact when travelling or attending events.
✔️Wash hands, boots, and equipment before and after handling different horses.
✔️Don’t share buckets, grooming tools, or tack between horses.
✔️ Isolate new or returning horses for at least 21 days before introducing them to the herd.
✔️ Monitor temperatures and watch for symptoms so you can spot abnormalities early.
✔️ Clean and disinfect trailers after every trip.
Please be weary of the information sources available, and consult reliable resources. The links below contain useful information:
https://equinediseasecc.org/Content/ContentDocs/DiseaseFactsheet-EHM.pdf
https://www.equinediseasecc.org/
https://aaep.org/resource/ehm-and-ehv-faq/
https://aaep.org/wp-content/uploads/2024/02/EHV1-4-guidelines-2021.pdf
https://aaep.org/wp-content/uploads/2024/03/EHM_EHV_FAQ_Final.pdf
Please do not hesitate to contact the clinic with specific inquiries or to purchase vaccines. 💉