State agriculture officials in Texas and Oklahoma have confirmed multiple cases of Equine Herpesvirus Type 1 (EHV-1) and Equine Herpes Myeloencephalopathy (EHM) following two major barrel racing events earlier this month. The outbreak has been linked to horses that attended the WPRA World Finals in Waco, Texas, held November 5–9, as well as the Barrel Futurities of America (BFA) World Championship at the Lazy E Arena in Guthrie, Oklahoma.
On November 18, the Texas Department of Agriculture issued an alert after Texas veterinarians confirmed an aggressive strain of EHV-1 in horses returning from the WPRA Finals. Commissioner Sid Miller urged owners, trainers, and facility operators who attended the event or traveled through the Waco area in the past two weeks to act immediately. According to the department, the virus has shown rapid spread and severe outcomes in affected animals. Horses that were present at the WPRA event, those transported to or from the show, or those that mingled with horses returning from the event are considered potentially exposed.
Clinical signs reported in confirmed cases vary widely and include fever, nasal discharge, coughing, depression, lethargy, and neurological symptoms such as stumbling, hind-end weakness, lack of tail tone, head tilt, and recumbency. Pregnant mares may experience abortion. The virus spreads through direct horse-to-horse contact, aerosolized droplets from coughing or sneezing, contaminated equipment such as buckets, tack, grooming tools, trailers, and thermometers, and by humans acting as mechanical carriers on their hands, clothing, or footwear.
The situation escalated on November 19 when the Oklahoma Department of Agriculture, Food and Forestry (ODAFF) confirmed multiple exposure risks in horses that attended the WPRA Finals and two confirmed cases of EHM in horses competing at the BFA World Championship. ODAFF announced that the BFA event was cancelled and directed that all horses who attended either the WPRA Finals or the BFA World Championship should be taken home and quarantined for the next fourteen days. Exposed horses must be isolated at least thirty feet from unexposed animals, with efforts made to prevent airflow from exposed horses toward others. Horses that have been exposed are not permitted to leave their home premises until they have completed fourteen days with no symptoms. Unexposed horses may travel, though officials recommend that they remain at home unless necessary.
Owners have been advised to closely monitor horses for fever over 101.5°F, nasal discharge, lethargy, hind-end weakness, or any neurological abnormalities. ODAFF noted that neurological presentations are considered medical emergencies and require immediate veterinary attention.
EHV-1 can appear in several forms, including respiratory infection, neonatal illness, abortion, or the neurological form known as EHM, which affects the spinal cord and brain and can be fatal. The incubation period ranges from three to fourteen days. Diagnostic methods include nasal swabs and blood tests, though testing asymptomatic horses may yield unclear results. Treatment is supportive, as antibiotics and antivirals are not effective against the virus. Severely affected horses are often hospitalized and isolated.
Because competitors from both the WPRA Finals and the BFA World Championship returned to multiple states immediately following competition, the total number of potentially exposed horses is unknown. The WPRA later confirmed that an outbreak originated at its Waco event. With horses moving between states and local competitions in the days that followed, officials caution that the geographic extent of exposure may be widespread.
This remains a developing situation, with additional event cancellations, movement restrictions, and veterinary updates expected as state agencies continue their investigations.
