The Canadian Food Inspection Agency recall initially involved Compliments brand Super 8 Beef Burgers sold in packages of six in Sobeys, Sobeys Urban, Foodland, Freshco and Price Chopper stores in Ontario and Atlantic Canada.
The recall now includes President's Choice Beef Burgers in 4.54 kilogram packages sold nationally in Loblaws banner stores and Webers Bucket of Burgers sold in 1.02 kilogram packages, which may have been distributed across Canada.
The CFIA said Toronto-based Belmont Meats Ltd. was voluntarily recalling the affected burgers and cautions that the recall may be expanded further.
Ontario Chief Medical Officer of Health Dr. Arlene King says that as of Wednesday there were seven confirmed and one suspect cases of E. coli in the province linked to the burgers.
After the initial recall was announced, health officials in southwestern Ontario said lab tests linked three cases of E. coli O157:H7 to the Compliments burgers. The Middlesex-London Health Unit said the three residents of London, Ont., were recovering.
King said people should check their fridges and freezers for the recalled burgers.
Food contaminated with E. coli O157:H7 may not look or smell spoiled but may cause serious and potentially life-threatening illnesses.
Anyone showing signs or symptoms of E. coli O157:H7 infection, in particular stomach pain and severe or bloody diarrhea, should contact their doctor.