The New World screwworm is not a worm at all but rather the destructive larval stage of a parasitic blowfly. (Hannah Lang/Texas A&M AgriLife)
Beyond the barn: What the return of New World screwworm means for human health
Texas A&m University System Staff
Reports of the New World screwworm returning to the United States have raised concern. Driven northward from Central America and expanding across our southern borders, this parasitic fly has officially reemerged after a 44-year absence, according to the U.S. Department of Agriculture (USDA).
Tuesday, July 21, 2026