PHBA and EHV-1 Outbreak
PHBA is concerned and aware of the Equine Herpesvirus Type 1 (EHV-1) outbreak that is being linked to an equine event in Waco, Texas. We are continuously monitoring the Oklahoma Department of Agriculture and the Texas Department of Agriculture websites & post regarding the potential spread in both states and, possibly, beyond.
PHBA always recommends following good biosecurity practices when traveling with your horses. Best practices for preventing EHV transmission include minimizing horse-to-horse contact and exposure to aerosolized nasal discharge or contaminated surfaces including clothing, people, buckets and barn items, as well as disinfecting surfaces and equipment that may have come into contact with infected horses.
Owners should monitor their horses, avoid unnecessary travel and contact their veterinarians with concerns.
We will continue monitor the situation and provide updates to PHBA members as more information is available.
Texas Department of Agriculture Commissioner Sid Miller released this press release with more information today. The Oklahoma Department of Agriculture’s website also contains resources and disease alerts.
You can visit the Equine Disease Communication Center website for more information about biosecurity practices, monitoring, quarantining and more.
Since PHBA had a show in Waco, anyone that was there and traveling to other shows needs to be very diligent and take precautions and observe their horses closely.
Multiple cases of equine herpes myleoencephalopathy, the neurologic form of EHV-1, have now been confirmed. Please reference the post from Oklahoma Department of Agriculture below for additional details.
As of 11:30 a.m. on Friday, Nov. 21, 2025, we have made changes to the required CVI statement for horses:
“The equine listed on this CVI have, during the 21 days prior to the shipment date, not originated from a premises under EHV-1 quarantine, not been exposed to an EHV-1 positive equine, and not attended any event where an EHV-1 positive equine has been confirmed.”
This change is to provide more clarity around the horses being brought into Oklahoma and for the Oklahoma horses going to upcoming equine events. Oklahoma horse owners should check with event staff before traveling to see if the event has extra requirements for entry.
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Following the recent increase in EHV cases, ODAFF is implementing a required statement to be listed on all equine CVIs for interstate movement into Oklahoma through Jan. 1, 2026.
At this time, we are not implementing any requirements for intrastate movement for horses.
For questions about the new requirement, please contact the Oklahoma State Veterinarian at 405.522.6141
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