A person in Maryland is confirmed to have a screwworm living in them. It is the first case in the U.S. in several years. The person, who was not identified, had traveled to the U.S. from El Salvador, ...

A parasitic fly with a flesh-eating larva has been found in Texas and could threaten the cattle industry if it spreads.

The New World screwworm fly is a type of blowfly whose larvae feed on the flesh of their victims. Currently, the parasite is spreading in North America, threatening not only livestock but also dogs, ...

The USDA plans to open fly breeding and distribution centers to stop the spread of the screwworm fly. Sterile male flies will be released to curb wild breeding and reduce the population. The pest can ...