CDC issued a field note on the 2016-2017 E. coli non-O157 outbreak in Canada associated with flour. In all, 29 people were infected in Canada and one in the US. Robin Hood flour was the identified brand. According to the report, "Eleven of these sixteen patients reported they ate or probably ate raw dough during their exposure period." "Eight patients were hospitalized, and one developed hemolytic uremic syndrome. Clinical isolates were typed as E. coli O121:H19."
CDC MMWR
https://www.cdc.gov/mmwr/volumes/66/wr/mm6626a6.htm?s_cid=mm6626a6_e
Notes from the Field: An Outbreak of Shiga Toxin–Producing Escherichia coli O121 Infections Associated with Flour — Canada, 2016–2017
Weekly / July 7, 2017