USABLE UNTIL JAN. 12, 2026
A worker handles a tray with Mediterranean fruit flies inside a bio-factory as Mexico's government reconditions a plant to a new sterile screwworm fly facility, part of the country's effort to eradicate the flesh-eating parasite that threatens its livestock industry and raises tensions with the United States, in Metapa de Dominguez, Mexico, Oct. 17, 2025. Photo: Daniel Becerril/Reuters

Canada too cold for New World screwworm

Cattle producers still need to be mindful of the tropical pathogen as Texas braces for outbreak

New World screwworm is closing in on the U.S. from Mexico, but the deadly livestock parasite isn’t likely to dig a surviving population in Canada, even if the fly species sneaks over the border.










Photo: Photos.com/Getty Images Plus

U.S. cattle ranchers criticize government for delayed reporting of human screwworm case

Human screwworm case was Maryland resident who recovered, state health department says

The patient with the first human infestation of travel-associated New World screwworm in the United States has recovered from the flesh-eating parasite, and there was no sign of transmission to other people or animals, the Maryland Department of Health said on Monday. Ranchers criticized a lack of transparency about the case.


Cattle at a feedlot near North Platte, Nebraska. (AndrewLinscott/iStock/Getty Images)

U.S. confirms nation’s first travel-associated human screwworm case connected to Central American outbreak

USDA criticized by cattle producers for failing to take timely measures to prevent screwworm from entering the U.S.

The U.S. Department of Health and Human Services on Sunday reported the first human case in the United States of travel-associated New World screwworm, a flesh-eating parasite, from an outbreak-affected country.