19/11/2025
⚠️ Equine Health Alert: EHV-1 / EHM Outbreak in Barrel Horses in Waco, Texas
We are closely monitoring a serious outbreak of Equine Herpesvirus-1 (EHV-1) — including cases of Equine Herpes Myeloencephalopathy (EHM) — that have been traced to the recent WPRA and Elite Barrel Race event in Waco, Texas.
Here’s what you need to know:
🧬 What Is EHV-1 / EHM?
- EHV-1 is a highly contagious virus that can cause respiratory disease, abortion in mares, and in its most severe form, neurologic damage (EHM).
- EHM (Equine Herpes Myeloencephalopathy) happens when the virus affects the brain or spinal cord, leading to ataxia (incoordination), loss of tail tone, recumbency, and other neurologic signs.
🔍 Why This Outbreak Is Concerning
- Veterinary clinics in Texas are calling this strain “highly aggressive”, with some fatal outcomes.
- Many of the confirmed cases are tied to horses that attended the Waco event in early November.
- The virus spreads easily through direct contact (nose-to-nose),
aerosolized droplets (coughing/sneezing), fomites (shared tack, buckets, grooming tools, trailers) and people (on clothing, hands, boots)
💪 Why This Matters for Ontario
- This outbreak is a reminder that serious equine health threats can emerge quickly, especially after large events. Being proactive and vigilant doesn’t just protect individual horses — it helps contain the virus and protects the broader equine community.
- Being proactive in Ontario can help prevent serious illness or even death among our horses. (There have been fatal cases in the province)
- Responsible barn management + biosecurity + early detection = our best defence.
📢 Alert for Ontario Horse Owners
- With recent EHV-1/EHM cases appearing across North America, staying informed is one of the most important steps we can take to protect our horses.
- The Ontario Animal Health Network is actively tracking these as “Equine Herpesvirus – Neurologic” alerts at oahn.ca/resources/ontario-equine-disease-alerts
- For verified, up-to-date outbreak alerts, case reports, and nationwide tracking, visit the Equine Disease Communication Center (EDCC) website at equinediseasecc.org
📌 Stay alert. Stay prepared. Stay proactive
Share this post with fellow horse owners, barns, and event organizers. Let’s all stay on high alert and act fast to keep our horses safe.
Up-to-date list with details and resources for equine diseases in Ontario.