A type of flesh-eating maggot is making a comeback — and it’s creeping toward the United States. The new world screwworm is a blowfly whose larvae burrow into animal wounds and gorge on living tissue.

California researchers are preparing for the possible return of the New World screwworm, a parasitic fly that feeds on living flesh and once devastated U.S. livestock. By monitoring traps and ...

Missouri and federal officials are gearing up to stop the advance of a parasitic fly that is less than 70 miles from the United States border with Mexico.