Last year, the USDA’s Food Safety and Inspection Service (FSIS) was petitioned to declare six additional disease-causing and potentially life-threatening strains of E. coli, those referred to as non-O157 Shiga-toxin producing E. coli (STECs) or more succinctly, “the big six,”  as adulterants. Specifically, those six strains include E. coli O26, O11, O103, O121