WYOMING — Wyoming’s horse community is on high alert following potential exposure to the equine herpesvirus (EHV) at events in the state earlier this month. While there are no reported cases yet in Wyoming, a horse from Colorado competed in Casper, Wheatland and Cheyenne on Nov. 15 and Nov. 16 and later tested positive for EHV.
The initial outbreak started in Waco, Texas, at the World Championship Barrel Racing Finals. Since the event, cases have been confirmed in Oklahoma, Louisiana, Colorado, New Mexico and Arizona.
There are nine known EHV viruses. EHV-1, EHV-3, and EHV-4 pose the highest risk to horses in the United States. The disease does not pose a risk to people.
According to the U.S. Department of Agriculture, EHV-1 primarily causes upper respiratory disease and stillbirths. In more serious cases, it can cause a neurological disease called equine herpes myeloencephalopathy (EHM) that can be fatal.
Horses that don’t develop EHM typically recover with no side effects. The disease can be prevented by isolating horses, practicing good hygiene and by vaccinating horses for EHV.
“EHV is a potentially lethal disease that spreads rapidly once introduced, and can be a nightmare for those of us in the industry,” local resident Reagan Dyer told Buckrail.
The virus spreads easily by contact, using shared equipment and touching contaminated surfaces. The Wyoming Livestock Board (WLSB) requests that any concerning signs or symptoms to be reported immediately to a veterinarian.
WLSB advises horse owners to take the following precautions:
- Equine movement and event attendance: Avoid attending events where horses are commingled.
- Practice strict biosecurity: Avoid sharing equipment, water or tack, and maintain distance between horses. Wash your hands and disinfect surfaces and equipment diligently.
- Monitor your horse twice daily: Look for signs of fever and temp your horse if you recently traveled to an event or are going to travel to one (above 101.5 Fahrenheit). Watch for nasal discharge or any neurologic symptoms (difficulty walking, lethargy or inability to stand).
- Report immediately: If you notice any concerning signs, especially a fever or neurologic symptoms, contact your veterinarian immediately. Veterinarians must report acute neurologic disease directly to the WLSB office.
Horse owners whose animals traveled to Texas or Oklahoma should immediately contact the WLSB office at (307) 777-7515 or (307) 840-1389, or email lsbforms-applications@wyo.gov for specific guidance on isolation and monitoring.
Buckrail will continue to provide updates if new information becomes available.
