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Flesh-eating screwworm detected 25 miles from US border in Mexico, USDA says

By Thomson Reuters Jun 2, 2026 | 12:38 PM

By Heather Schlitz

CHICAGO, June 2 (Reuters) – A parasitic fly that eats warm-blooded animals alive and could cause ​millions of dollars in economic ‌damage was found in Mexico within 25 miles of the U.S. border, U.S. Agriculture Secretary Brooke Rollins said on Tuesday.

The detection of ‌New ​World Screwworm in a ⁠five-year-old goat in ⁠Mexico’s Coahuila state further increases the threat facing the U.S. beef industry and cattle ranchers, who have monitored ​the flesh-eating fly’s northward progress through Mexico for over a year. This ⁠is the closest ⁠confirmed case to the U.S. ​border during the most recent outbreak, Rollins ​told reporters on a call.

“There’s no ‌doubt that this is a very, very serious threat to our livestock,” Rollins said.

USDA said on Friday that screwworm ⁠had been found in a young sheep in Mexico within 31 miles (50 km) of the ⁠U.S. ‌border.

The fly feeds on the ⁠flesh of living animals, eventually ​killing ‌their hosts if not ​treated. It ⁠could cause $1.8 billion in damage to Texas’ economy alone and would likely raise U.S. beef prices by shrinking the U.S. cattle supply, experts have said.

(Reporting by ​Heather Schlitz)