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Definition of SCREWWORM
: a blowfly (Cochliomyia hominivorax) of the warmer parts of America whose larva develops in sores or wounds or in the nostrils of mammals including humans with serious or sometimes fatal results; especially: its larva
: any of several flies other than the screwworm and especially their larvae which parasitize the flesh of mammals
: either of two dipteran flies of the genus Cochliomyia: a: one (C. hominivorax) of the warmer parts of America whose larva develops in sores or wounds or in the nostrils of mammals including humans with serious or sometimes fatal results; especially: its larva b:secondary screwworm
: a dipteran fly of the genus Chrysomyia (C. bezziana) that causes myiasis in the Old World
Any of several North and South American blowfly species named for the screwlike appearance of the larva's body, which is ringed with small spines. Screwworms attack livestock and other animals, including humans. The true screwworm (Cochliomyia hominivorax) and the secondary screwworm (Callitroga macellaria) develop in decaying flesh; they may also attack healthy tissue. Each female deposits 200–400 eggs near an open wound. The larvae burrow into the tissue and, when mature, drop to the ground to pupate. Severe infestations (myiasis) may kill the affected animal.