The United States is facing a resurgence of the New World screwworm, a flesh-eating parasite thought to be largely eradicated since the 1960s. Five animal cases have now been confirmed: four in Texas-three calves and a goat-and one dog in New Mexico.
Agricultural officials have established 20-kilometer quarantine zones around affected areas. The dog had no travel history to known hotspots, prompting further investigation. 'We need the partnership of animal owners across the region,' said Dudley Hoskins, Under Secretary of Agriculture for Marketing and Regulatory Programs. 'Check your animals closely and report anything suspicious.'
The screwworm fly lays eggs in open wounds; the larvae feed on living tissue. Scientists caution that while new cases may emerge, heightened surveillance is likely detecting existing infestations. Human risk remains low, but prolonged exposure near livestock increases danger. Symptoms include non-healing wounds, foul odors, and visible maggots.