Flesh-eating screwworm found within 31 miles of US border, says USDA
By Heather Schlitz CHICAGO, May 29 (Reuters) - A devastating parasitic fly that eats warm-blooded animals alive and could cause millions of dollars in economic damage to the U.S. economy has been found in a young sheep in Mexico within 31 miles (50 km) of the U.S. border, the U.S. 
