The flour in 10-kilogram bags was sold in British Columbia, Alberta, Saskatchewan and Manitoba.
It was recalled Tuesday by the Canadian Food Inspection Agency (CFIA) after it was determined some of the flour was contaminated with E. coli O121.
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Six people required hospitalization, the Public Health Agency said Wednesday in a release.
"These individuals have recovered or are recovering," the agency said.
A spokesperson for the Canadian Food Inspection Agency said it is looking into how the flour, which was sold in Western Canada, ended up making people sick in Newfoundland and Labrador.
The agency said any 10-kilogram bags of Robin Hood brand all-purpose flour with a best-before date of April 17, 2018, should be thrown out or returned to the store.
The recalled product's UPC is 0 59000 01652 8.
According to the company that produces Robin Hood flour, the recalled product was produced at a mill in Saskatoon.
"The investigation is ongoing and it is possible that additional products linked to the outbreak investigation may be identified," the health agency said.
Symptoms of E. coli poisoning can include nausea, vomiting, mild to severe abdominal cramps, and watery to bloody diarrhea