Enforcement ‘Big Six’ banned 9 years ago are getting their due with E. coli testing USDA’s Food Safety and Inspection Service (FSIS) plans to expand its routine verification testing to include six Shiga toxin-producing Escherichia coli (non-O157 STEC; O26, O45, O103, O111, O121, or By News Desk / 15 Jun 2020