The U.S. Centres for Disease Control believes romaine lettuce from Salinas, California, is responsible for spreading E. coli 0157:H7 food-poisoning bacteria.
The Canadian Food Inspection Agency said it believes one case here might be linked to the U.S. outbreaks.
Because romaine lettuce is seldom labelled to indicate whether it came from Salinas, California, Canadians are being warned to be cautious about eating any romaine lettuce.
The Canadian case has yet to be definitely confirmed as caused by romaine from Salinas.
