Thirty-two illnesses have been reported from 11 states, including 13 people who have been hospitalized.
Ill people in this outbreak were infected with E. coli bacteria with the same DNA fingerprint as the E. coli strain isolated from ill people in a 2017 outbreak linked to leafy greens in the United States and to romaine lettuce in Canada.
The United States Food and Drug Administration, along with the Centre for Disease Control, are coordinating with the Public Health Agency of Canada and the Canadian Food Inspection Agency, in investigating this outbreak of E. coli O157:H7 illnesses in the United States and Canada.
A specific source of the romaine lettuce has yet to be identified. Others may feel as though they have a bad case of upset stomach, and, in some cases, individuals may become seriously ill and must be hospitalised. "You can pinpoint a potential source only to find out a few weeks, months or years later it was maybe not the source and we ruined an industry in response".
"Contaminated romaine lettuce may still be on the market, including in restaurants, grocery stores and any establishments that serve food", according to PHAC.
The cause of contamination has not yet been identified.
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Grocery giants Empire Company Ltd., Loblaw Companies Ltd. and Metro Inc. haven't waited for an official request though.
The Public Health Agency of Canada issued a warning Tuesday afternoon, telling people in Ontario and Quebec not to consume romaine lettuce.
Chan added that most of Canada's romaine lettuce is imported from the USA because Canada's growing season ended in August.
Those affected were between the ages of five and 93 and were located in Ontario and Quebec.
Eleven (79%) of 14 people interviewed reported eating romaine lettuce.