A screwworm may sound like a creature straight out of a Stephen King novel. Unfortunately, it's a real pest — one that has made its way back to the United States after being kicked out years ago. According to the U.S. Centers for Disease Control and Prevention (CDC), a screwworm (or New World Screwworm) is a type of fly that can literally get under your skin. After it enters your body through an open cut or sore, it lays hundreds of eggs. When the eggs hatch, they hungrily feed on the living tissues around them. It's kind of like how a tapeworm feeds, although their food sources are different. (Read how a tapeworm infection is diagnosed .)

Having tiny screwworms burrowing into your body is as painful as it sounds. That said, an infestation of screwworm larvae is treatable through t

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