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.
Cattle producers still need to be mindful of the tropical pathogen as Texas braces for outbreak
U.S. border has been closed to Mexican cattle since July due to New World screwworm cases
Human screwworm case was Maryland resident who recovered, state health department says
USDA criticized by cattle producers for failing to take timely measures to prevent screwworm from entering the U.S.