A Maryland resident is diagnosed with screwworm. Here’s what to know about the flesh-eating parasite.

A Maryland resident diagnosed with New World screwworm after traveling to El Salvador marks the first U.S. case linked to a current outbreak; the individual has since recovered with no transmission reported. New World screwworm is a rare parasitic fly that infests open wounds, posing low risk to the public, though officials are concerned about its potential spread in the U.S. again.

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