06/05/2026
Dear AQHA Member,
We want to make you aware that New World Screwworm (NWS) has been confirmed in Zavala County, Texas. At this time, Texas officials have confirmed a single case, with no additional detections reported. USDA and state officials have activated established response plans, including movement restrictions in the affected area, expanded surveillance efforts and the release of sterile flies; a proven tool for controlling and eradicating New World Screwworm populations. These movement restrictions apply to a restricted zone extending 20 kilometers (12.4 miles) around a confirmed detection, and animal movement may still be permitted with approval from the appropriate 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 horse owners and caretakers, vigilance will be critical in the weeks and months ahead. Horse owners should closely monitor 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 you suspect NWS contact TAHC immediately.
Additional information and resources are available at screwworm.gov, with current Texas updates and resources available at https://www.tahc.texas.gov/emergency/nws.html.
For the latest horse-specific information and updates, visit the Equine Disease Communication Center, a trusted resource for the equine industry.
Thank you for your attention to this important matter and for your continued commitment to the health and well-being of our horses.
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Learn how the U.S. Government prevents New World screwworm and what to know about risks, surveillance, sterile-fly control, travel, and more.
