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Deadly horse outbreak kills two horses in Texas after rodeo events in Waco and Stephenville.
ctorres@star-telegram.com
The Texas Department of Agriculture is warning horse owners to take the EHM virus seriously and begin biohazard precautions.
Equine Herpesvirus Type 1 was discovered during the Women’s Professional Rodeo Association world finals and barrel racing in Waco from Nov. 5 to Nov. 9. Since then, there has been a growing number of cases of the deadly horse virus in Texas and neighboring states.
Texas Agriculture Commissioner Sid Miller told the Star-Telegram Friday that some horses have died due to the outbreak. The Texas Animal Health Commission has confirmed at least two deaths.
“A concerning number of mortalities in horses suspected to have EHM have been reported but not yet confirmed with laboratory testing,” the agency wrote in an emial. “At least two horses in Texas have died with laboratory confirmation of EHM.”
Equine herpes myeloencephalopathy is a neurologic syndrome caused by the EHV-1 virus. While EHV-1 is common in horses, the neurologic form of the disease is rare, according to the Equine Disease Communication Center.
Officials said this is a particularly deadly virus, especially in horses that develop neurological symptoms. Strict monitoring is vital. Any horse that has been exposed to the virus needs to quarantine and remain under observation for at least 14 days.
Miller said the cases originated from the Extraco Events Center in Waco and the 377 Arena LLC after rodeo events. There are also cases in Oklahoma, New Mexico, and Colorado. A case in Alberta and another in Maryland are unrelated to the Texas outbreak.
“So, we’re urging horse owners to kind of hunker down. The incubation period is 14 days to 21 days,” Miller said. “Monitor your horses, we recommend twice a day, watch for nasal discharge, watery eyes, maybe a slight cough, if you suspect them, take the temperature twice a day.
“Once you see an elevated temperature, you need to call the vet. Don’t take them into vet. Don’t take your horses off your premises. We don’t need you to spread it. So use good biosecurity measures. Do not bring any horses on your place. Do not let any leave.”
Miller said they are recommending a pause on any ancillary services that would visit an owner’s property such as farriers, horseshoers, equine dentists and chiropractors.
“About 99% of the people will be fine if you didn’t attend one of those events, at those arenas where this originated, you should be fine, as long as you hadn’t had interaction or commingling with horses that were at that event,” he said.
“Most everybody’s going to be just fine,” Miller said. “But don’t assume you’re going to be fine. Take the precautions. Let’s wait this out and see.”
The numbers here in Texas have increased to nine since Thursday when the count of infected horses was just two.
“While the extent of this EHV-1 outbreak is still not fully known, TAHC is taking this situation seriously,” TAHC said
The agency told the Star-Telegram Friday that the virus is still showing signs of being acute with a rapid progression and “high clinical severity.”
“TAHC investigation into the character and epidemiology of this disease event is ongoing but the need for rapid and proactive actions to curb the spread is clear,” a spokesperson said. “Measures to prevent contact of horses from exposure to the virus and increased biosecurity overall are recommended.”
The agency also said the National Assembly of State Animal Health Officials has suspended Extended Equine Certifications of Veterinary Inspection.
Global Vet Link, whose platform helps create certifications for horses and other paperwork related to equine regulations, said on its website states are not accepting EECVI movement permits for horses during the outbreak.
While the extended certifications have been temporally paused, the use of certificates of veterinary Inspections can be used to still enter Texas.
“Additionally, Texas equine market permits will not be issued by TAHC at this time,” TAHC said. “Equine intended for sale in Texas must have a valid CVI and current EIA test prior to entering the state.”
The state said its encouraging horse owners to continue to work with their veterinarians to assess risk and mitigation plans.
“Take this virus seriously, and weigh potential risks when commingling equine,” the TAHC said in a statement.
Tim Long, general manager of Cowtown Coliseum, said the Professional Rodeo Cowboys Association would be using two horses from an employee who had them at his ranch.
“He had the horses on his ranch, and he’s going to hold them there, and hold them there to use only here at this building,” Long siad.
Long said it’s taken a lot of work to make sure that things are properly cleaned to prevent contamination.
“We’ve sanitized the building to no end; we’ve spent two days cleaning top to bottom and sanitizing with proper chemicals to make sure that there’s nothing left. And I think they’ve done, the crews have done a wonderful job getting that done.”
This story was originally published November 21, 2025 at 5:29 PM.
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Fousia Abdullahi
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