USDA will begin testing beef trim for non-O157 strains of E. coli on June 4, according to a notice to be published in the Federal Register. The testing will focus on six Shiga toxin-producing Escherichia coli (STEC), in addition to E. coli O157:H7.

According to the Center for Infectious Disease Research & Policy (CIDRAP), these six STEC strains account for 80 percent of non-O157 E. coli illnesses infections. The Centers for Disease Control and Prevention estimates non-O157 E. coli strains cause 112,000 illnesses annually, with about 36,700 of those attributed to beef.