Livestock producers are being urged to stay alert following the recent confirmation of a New World screwworm case in the United States.

The USDA confirmed New World screwworm in a calf in Zavala County, Texas, on June 3. The CDC says no locally acquired human infestations have been reported in the United States, but the outbreak has been moving northward through Central America and Mexico since 2023, affecting livestock, pets, wildlife, and people.

New World screwworm is a serious pest that can infest wounds in warm-blooded animals. Because of the potential risk to livestock and agriculture, the USDA has released preparedness resources for producers, including current status updates, a U.S. response plan, fact sheets, field identification guides, and additional response materials.

The National Cattlemen’s Beef Association says it also plans to release simplified resources in the coming weeks to help producers better understand the USDA response playbook.

Producers are encouraged to review USDA materials and monitor livestock closely for suspicious wounds or signs of infestation.