Deer Parasite in Florida Keys Possible Costly Threat

A rare deer parasite has cropped up in the Florida Keys that biologists haven’t seen in the United States for decades. Known as New World screwworm, the parasite is caused by flies that lay eggs in the open wounds of animals, but this particular variety was thought to be eradicated in the 1970s.

Officials on a preserve in the Florida Keys that manage…

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