I was thinking of O-157 (https://en.wikipedia.org/wiki/Escherichia_coli_O157:H7) as it was associated with ground beef contamination back in the 90s.
The best known strain in this category is O-157:H7.
Of course, I may have made some errors, my background is in biochem not microbio.
https://en.wikipedia.org/wiki/Shigatoxigenic_and_verotoxigen...