Equine herpes myeloencephalopathy has been confirmed in Wellington County, Ontario. On the evening of April 10, 2025, a 24 year old Thoroughbred gelding became acutely ataxic and was euthanized. The horse was positive for equine herpesvirus 1 (EHV-1) on PCR. The horse was vaccinated against EHV-1. The facility owner has instituted voluntary animal movement restrictions and biosecurity procedures.