USDA Intensifies Response Following Second Screwworm Detection in Texas

The U.S. Department of Agriculture (USDA) has confirmed a second case of the New World screwworm in Texas, discovered in a calf in Zavala County. This latest finding occurs in close proximity to an initial case reported earlier in the week. While this marks only the second instance of the parasite in the state since 1966, the USDA has moved quickly to contain the threat, noting that both detections fall within the established movement control zones and sterile insect dispersal areas already in operation.

The New World screwworm is a highly destructive parasitic fly that feeds on the living tissue of warm-blooded animals, including humans. The larvae burrow into flesh, creating severe, painful wounds that can prove fatal if left untreated. Although the pest is common in South America and the Caribbean, its recent northward migration through Central America and Mexico has prompted significant concern among U.S. agricultural officials. The USDA has been preparing for this potential incursion for months, utilizing sterile fly releases—distributing millions of flies weekly—and implementing strict livestock trade restrictions at southern ports of entry.

The implications of an unchecked outbreak are substantial, particularly for Texas, which leads the nation in cattle production. Economic projections suggest that a widespread infestation could result in losses exceeding $1.8 billion for the state’s economy, with annual producer costs potentially reaching $732 million. By deploying mobile response units and intensifying surveillance, the USDA aims to replicate its historical success in eradicating the pest. However, the agency and industry leaders are urging local producers to remain vigilant and report any suspected cases immediately to prevent the parasite from gaining a foothold in the domestic livestock population.