Screwworm outbreak contained near US border, Mexico says Mexico treats infected bovine; US border remains tight23 September 2025 23 September 2025 2 minute read 2 minute read By: By: Global Ag Media North AmericaA confirmed case of an animal infected with the flesh-eating screwworm parasite in Mexico's northern Nuevo Leon state near the US border was immediately treated to prevent a further outbreak, Reuters reported, citing the Mexican government on Monday. The country's agriculture ministry said there was no risk of adult screwworm fly emergence due to the early detection of the infected bovine, which was confirmed on Sunday. Fly traps in northern Mexico have not detected a single screwworm fly, the statement added. The infected animal was in a shipment of 100 animals originating from the Gulf Coast state of Veracruz, Mexico said. Mexican President Claudia Sheinbaum said the country was waiting on an assessment by a team of USDA experts that recently visited Mexico.