Adult New World screwworm flies resemble the common blowfly but have multiple distinguishing features.

New cases of the New World Screwworms in Veracruz, Mexico have caused the U.S. Department of Agriculture to once again close southern borders to livestock days after reopening them. On ...

The U.S. has closed its southern border again to livestock imports, saying a flesh-eating parasite has moved further north in ...

Tight cattle supply, rising import costs, and new livestock restrictions threaten to keep beef prices soaring into 2026.

Should the flies reach the states, the larvae could infest livestock, pets, wildlife and, possibly, even people.

The US stopped livestock imports from northern Mexico due to the screwworm fly threat. USDA Secretary Rollins announced border tightening and a $30M sterile fly program.