Dec 22, 2025 · Learn how the U.S. Government prevents New World screwworm and what to know about risks, surveillance, sterile-fly control, travel, and more.

Infestation of a live vertebrate animal by a maggot is scientifically termed myiasis. While the maggots of many fly species eat dead flesh, and may occasionally infest an old and putrid wound, screwworm …

Aug 27, 2025 · New World screwworm (NWS) is a species of parasitic fly that can cause myiasis and feeds on live tissue. It primarily affects livestock, but it can also infest people. NWS is typically found …

Aug 25, 2025 · U.S. officials confirmed a case of the flesh-eating parasite in a person who traveled from El Salvador. Screwworm typically affects cattle in South America but has spread north in recent years.

Dec 22, 2025 · Earlier this fall, the New World screwworm – the flesh-burrowing larva of a blowfly (Cochliomyia hominivorax) – was detected in cattle in Mexico just 70 miles from the U.S. border. …

The New World screwworm (NWS, Cochliomyia hominivorax) is a parasitic fly native to the Western Hemisphere. It lays eggs in the living tissue of fresh wounds in warm-blooded animals.

Jul 9, 2025 · New World screwworms are the flesh-eating, larval form of Cochliomyia hominivorax, a species of blow fly.

2 days ago · New World Screwworm Found in Newborn Calf 197 Miles from U.S.-Mexico Border Texas producers need to remain on alert as NWS continues to move north. The newest detection is in the …

Aug 25, 2025 · A human case of flesh-eating screwworm was detected in the United States related to the latest outbreak of the parasite in Central America, according to officials.

Jul 30, 2025 · Resurgence of the New World screwworm in Central America and Mexico has U.S. livestock producers on edge. The screwworm, a parasite, feeds on living tissue in livestock and other …