New World Screwworm Resources

As of June 8, 2026, the USDA has confirmed 4 cases of the New World Screwworm in Texas, including a confirmed case in a goat in Gillespie County, and 1 in New Mexico. The United States Department of Agriculture (USDA) and the Texas Animal Health Commission (TAHC) is encouraging farmers, ranchers, and anyone who might engage with livestock, wildlife, or domesticated animals to be on the lookout for possible cases of New World Screwworm infestation.

Two of the confirmed cases are in Zavala County, one is in La Salle County, a third in Gillespie County, and one in a dog in Lea County, New Mexico. Please reference screwworm.gov for the latest on confirmed cases within the United States and resources related to readiness and treatment. The USDA and TAHC establishes quarantine zones around confirmed cases, please refrain from moving any and all live animals in or out of the quarantine zones without proper inspection from state or federal officials.

The Federal Government, led by the USDA, continues to engage with the government of Mexico and local officials in Texas to actively monitor and prevent the spreading of the screwworm into Texas. Livestock importation from Mexico is currently paused to prevent the possibility of transmission.

Representative Roy is in constant communication with Secretary Rollins to maintain a clear picture of the situation. The below resources and recommendations have been assembled for the benefit of constituents of TX-21 who are preparing to respond to the threat.

USDA Resources:

1. Screwworm.gov

   -Website managed by the USDA to provide timely updates on confirmed cases and information for interested parties.

2. Tahc.texas.gov

   -Website managed by the TAHC to provide timely updates from the State of Texas and resources to report suspected and confirmed screwworm cases.

3. Local veterinarians

   -USDA and TAHC recommend that ranchers and farmers put eyes on their livestock every day to detect signs of infestation, treat and cover open wounds on animals, and maintain a working relationship with local veterinarians should a suspected case occur.

4. [email protected]

   -USDA's screwworm specific email tipline is monitored 24/7 should anyone have questions or concerns.

5. Treatments given Emergency Use Authorization

   -Find treatments given Emergency Use Authorization for preventative and reactive use against NWS under the "Latest News" tab linked above.