USDA releases sterile flies to combat deadly screwworm parasite threatening cattle in the U.S.

The USDA has released sterile screwworm flies to combat the invasive parasite threatening cattle, with the potential to affect pets and humans. This move follows reports of screwworm infestations in U.S. cattle, which can kill animals within three days. The agency is bolstering its efforts with an $8.5 million fly dispersal facility in Texas and hosting a symposium to enhance preparedness. Texas is also developing synthetic baits and a vaccine. The exact causes for the parasite's resurgence are unknown but may involve increased animal movement and climate shifts.