The first human screwworm case in the U.S. has been traced to a person in Maryland who traveled from Guatemala.

A human case of a flesh-eating parasite known as New World screwworm has been confirmed in a Maryland resident, the first in the United States in years, according to U.S. and state health officials.

A Maryland resident who traveled to El Salvador has been diagnosed with New World screwworm — the first reported U.S. case tied to travel to a country with a current outbreak. The Centers for Disease Control and Prevention confirmed the diagnosis on Aug.