Aspects of this topic are discussed in the following places at Britannica.
...fly species, so called because of the screwlike appearance of the body, which is ringed with small spines. These larvae attack livestock and other animals, including humans. The true screwworm (Cochliomyia hominivorax; formerly, Callitroga americana) and the secondary screwworm (Callitroga macellaria) develop in decaying flesh in surface wounds of domestic animals and...
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