Texas horse owners encouraged to stay informed and monitor animals closely after a confirmed case of the New World Screwword has been identified.

Photo by Lindsey Salestrom

ZAVALA COUNTY, TX–JUNE 6, 2026–New World Screwworm (NWS) has been confirmed in Zavala County, Texas. Texas Animal Health Commission officials have identified a single case, with no additional detections reported at this time.

In response, the U.S. Department of Agriculture and the Texas Animal Health Commission have activated established response protocols. These measures include movement restrictions in the affected area, expanded surveillance efforts and the release of sterile flies, an established and effective method for controlling and eradicating New World Screwworm populations.

Movement restrictions apply within a 20-kilometer (12.4-mile) radius of the confirmed detection site. Animal movement may still be permitted with appropriate authorization from regulatory authorities.

While this is a significant development, it is important to remember that New World Screwworm is treatable, and there are well-established protocols that can lead to successful outcomes when cases are identified and addressed early. AQHA members are encouraged to speak with their veterinarians for guidance on prevention, detection and treatment options.

As part of continued awareness efforts, AQHA is urging members to remain vigilant in monitoring animals for wounds and cuts, as well as surgical sites and other areas that may attract flies. Keep wounds clean and protected whenever possible and consult your veterinarian promptly if you observe larvae or signs of infection. If New World Screwworm is suspected, do not move the animal and contact your veterinarian immediately.

"We've heard time and time again that the best thing you can put on your animals is your eyes," said Katie Reynolds, AQHA director of youth development and public policy. "Early detection is key with this pest, and experts know that New World Screwworm is treatable with medication. Now that we know New World Screwworm has been found in Texas, we're asking our members to stay informed and follow the expert advice available to all of us through our veterinarians and through state and federal resources."

If New World Screwworm is suspected, animal owners are instructed to contact the Texas Animal Health Commission immediately.

Additional information and updates are available at Screwworm.gov and through Texas-specific resources at TAHC New World Screwworm Updates.

For horse-specific guidance and ongoing disease updates, visit the Equine Disease Communication Center, a trusted resource for the equine industry.

AQHA news and information is a service of the American Quarter Horse Association. For more information visit www.aqha.com/news or subscribe to our news text "AQHA In the Know" for the latest Association updates.

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