DENVER (KDVR) -- A multi-state outbreak of Equine Herpesvirus (EHV-1) is prompting new restrictions at horse shows across the country -- and raising questions in Colorado just weeks before the National Western Stock Show begins its 16-day run.
EHV-1 is a highly contagious respiratory and neurological virus that can spread through direct horse-to-horse contact, shared equipment, trailers, and even clothing. In recent weeks, several states have confirmed new cases and temporarily paused or canceled shows out of caution.
Colorado's State Veterinarians have confirmed one case linked to this outbreak, with most others tied to Texas and Oklahoma. Officials say the overall number of infections remains low, but the virus's ability to spread quickly requires close monitoring.
National Western Stock Show CEO Wes Allison told FOX31 the organization is tracking the outbreak "in real time" with veterinarians and industry partners.
"We will continue to monitor the situation and make sure we are up to date and keep all of our exhibitors up to date as well," Allison said.
The Stock Show draws thousands of horses from across the U.S., making biosecurity a priority every year. Organizers say they are preparing enhanced cleaning protocols, reviewing stall sanitation products, and staying in contact with veterinary experts should any adjustments be needed.
Local veterinarians say the outbreak is concerning but remains manageable.
"It has been now found in eight different states from this outbreak, but the numbers have stayed relatively low," Dr. Kelly Tisher, an equine veterinarian at Littleton Equine Medical Center, told FOX31. "While it's your horse that's affected? It's a big deal ... but overall for a national outbreak it's been pretty well contained."
Vets recommend that horse owners keep vaccinations up to date, avoid sharing water buckets or tack, monitor temperatures closely, and contact a veterinarian immediately if a horse spikes even a low fever.
As of now, Stock Show leaders say they do not expect major disruptions to the January event but will adjust protocols if the outbreak grows.