First human case of flesh-eating screwworm parasite detected in the U.S.

The first human case of the flesh-eating parasite new world screwworm has been detected in the United States.

Source: First human case of flesh-eating screwworm parasite detected in the U.S.

tl;dr: person travelled recently to el salvador, where it’s not eradicated; is eradicated in usa, and presumably canada.