The number of confirmed New World screwworm cases in the United States has risen to 12, with 11 cases in Texas and one in New Mexico. This parasitic fly, which targets warm-blooded animals, poses a significant threat to agriculture. Texas Governor Greg Abbott has declared a state of disaster as the U.S. Department of Agriculture (USDA) works to contain the outbreak.

The New World screwworm was eradicated in the U.S. in the 1960s but has reemerged, spreading north through Central America and Mexico. According to a press release from the USDA Animal and Plant Health Inspection Service, the first case was detected in a calf in Zavala County, Texas, on June 3, 2026. Since then, six domestic animal cases have been confirmed, including four cattle, one goat, and one dog.

The USDA has been proactive in its response, releasing sterile flies in Mexico and along the Texas border to curb the fly population. This strategy aims to prevent further spread, as reported by Global Biodefense. Efforts also include emergency drug authorizations and the construction of a $750 million sterile fly production facility in Texas.

The USDA emphasizes that the screwworm does not pose a food safety risk. However, it remains a severe threat to livestock and wildlife. The agency has increased surveillance and containment measures, including quarantines and movement controls in affected areas. The American Ag Network reports that USDA officials are confident in their ability to manage the outbreak, citing past successes in eradicating the pest.

Federal and state officials continue to monitor the situation closely, urging producers and pet owners to report suspicious wounds and maintain vigilance. The coming weeks will be critical in determining whether the outbreak can be contained or if further measures will be necessary.

Dan O'Donnell