Flesh-Eating Screwworm Confirmed in Texas: A Biosecurity Failure Demands Action

The detection of New World screwworm (NWS) in a calf in Zavala County, Texas—the first confirmed U.S. case in 60 years—is not merely a pest outbreak; it is a predictable consequence of underfunded biocontrol programs and inadequate border inspection. The USDA's sterile insect technique (SIT) program, which successfully eradicated NWS from the U.S. in the 1960s, has been chronically under-resourced, especially at the U.S.-Mexico border. This has allowed the pest to advance from Central America through Mexico, reaching within 25 miles of the U.S. border long before this detection. The affected animal was a three-week-old calf, but NWS larvae can infest any warm-blooded animal, including humans, causing severe tissue damage and death. The economic stakes are enormous: one study estimates a re-establishment of NWS could cost U.S. livestock producers up to $1.5 billion annually in treatment, prevention, and trade restrictions. The article's framing—blaming border crossing patterns—sidesteps the real failure: the U.S. has allowed a proven, cost-effective control method to falter, leaving rural communities and the food supply vulnerable.