Cochliomyia hominivorax, the New World screwworm fly, New World screwworm (NWS) or simply screwworm or screw-worm, is a species of parasitic blowfly whose larvae (maggots) eat the living tissue of warm-blooded animals. It is present in the New World tropics. Of the four species of Cochliomyia, only C. hominivorax is parasitic; a single parasitic...