The U.S. has confirmed a rare human case of New World screwworm, a flesh-eating parasite that typically infects livestock but can be deadly to people too.

A Maryland resident suffered an infestation of the screwworm after traveling to El Salvador, the U.S. Department of Health and Human Services (HHS) told TIME in an email. Reuters first reported the news. Central America is currently grappling with outbreaks of the destructive pest, which have been threatening livestock and infecting people. The U.S. embassy in Nicaragua said in July that more than 120 human cases of screwworm infestation had been reported in the last year.

The U.S. Centers for Disease Control and Prevention (CDC) confirmed the Maryland case on Aug. 4 after reviewing images of the insect causing the infestation, H

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