Can the New World Screwworm be stopped?

The New World Screwworm, a parasitic fly that lays eggs in living tissue, has re-emerged in Texas, posing a significant threat to livestock and public health. Once eradicated from North America through the Sterile Insect Technique—a process involving the mass release of radiation-sterilized flies to disrupt reproduction—the parasite has returned, necessitating rapid containment, movement restrictions, and rigorous surveillance. Experts highlight that while the infestation is not a food safety risk, its spread could affect beef production costs. Current response efforts are hampered by a limited supply of sterile flies and increased wildlife populations compared to the last eradication campaign 44 years ago. Addressing this re-invasion requires scaling up production facilities in Mexico and Texas to effectively overwhelm the wild population and restore the region to a screwworm-free status.