Flesh-eating screwworms have been detected in the US for the first time since 1966. The New World Screwworm are parasitic flies who lay eggs, which hatch and burrow through living flesh and eventually kill their host if untreated. For the past year, the worms have been increasing in Central America and Mexico. Tap the link in @BBCNews's bio to read more about how the screwworm spreads. #Screwworm #US #BBCNews