Concerns Arise Over Screwworm Fly’s Return to the U.S.

The New World screwworm, a flesh-consuming fly known for its larvae feeding on livestock, wildlife, and pets, has surfaced again in the United States. This comes 60 years after these parasitic insects were declared eradicated from the country.

Federal officials disclosed on Wednesday night that an infestation was discovered in a 3-week-old calf in Texas. Extensive efforts over several decades succeeded in eliminating the flies from North and Central America. Despite this, the insects have gradually been migrating north from South America over recent years, nearing the U.S. border.

Historically, screwworm flies have severely impacted cattle, and their resurgence could impose new challenges on cattle farmers and potentially elevate beef prices. Caleb Hubbard, an entomologist at New Mexico State University, remarked, “It has the potential to be damaging, very damaging, to our livestock industry.” These pests do not limit their attacks to cattle. They can threaten wildlife, pets, and in rare instances, humans.

Both federal and state authorities are taking action to manage the infestation in Texas. They emphasize that the threat to the American populace remains minimal. Brooke Rollins, the agriculture secretary, stated during a news briefing on Thursday, “If we all work together and follow animal treatment and the movement restriction guidance, there is no reason to believe that this incursion will result in any sort of establishment of the pest.”