Foodborne Illness Outbreaks Non-O157:H7 STEC Outbreaks Discovered On cue with recent discussions regarding the regulation of non-O157:H7 strains of E. coli, two outbreaks of non-O157 shiga toxin-producing E. coli (STEC) strains have just emerged. Michigan and By Zach Mallove / 27 Apr 2010