New World screwworm has been confirmed in a South Texas calf, marking the first U.S. case since the 1960s, according to the Agriculture Department. The parasitic fly larvae infest livestock wounds, causing severe tissue damage and economic losses for ranchers. This detection signals a potential threat to cattle operations across the southern border region.

The pest's northward movement began after it was spotted at the Guatemalan-Mexican border in 2024, suggesting cross-border spread. USDA officials face mounting pressure to contain the outbreak before it reaches major cattle-producing states. The screwworm previously devastated livestock industries before successful eradication programs eliminated it from the continental U.S. decades ago.

Texas ranchers now confront quarantine measures and potential treatment costs that could strain operations. The cattle industry supports thousands of jobs in the region, and invasive pests historically trigger import restrictions. USDA may need to revive sterile insect release programs that proved effective in past eradication efforts.

This re-emergence tests the agriculture sector's biosecurity protocols and could reshape border inspection policies. The Agriculture Department must act quickly to prevent economic damage to cattle producers already dealing with feed costs and supply chain pressures.