Foodborne and Waterborne Disease in Canada - 1979 Annual Summary.

Data on foodborne disease in Canada in 1979 are compared with data for 1978. A total of 825 incidents, comprising 650 outbreaks and 175 single cases, causing illness in 5503 persons was reported for 1979. The number of incidents and cases decreased by 1.3% and 7.7%, respectively, from 1978 to 1979. Like the previous year, Salmonella spp. were responsible for more incidents (62) and cases (1754) than any other agent. Other incidents were caused by Staphylococcus aureus (29), suspect mold and yeast (18), Bacillus cereus (16), Clostridium perfringens (11), Bacillus subtilis (1) and Hafnia alvei (1). No Clostridium botulinum cases were reported. Five incidents of trichinosis, three of paralytic shellfish poisoning, two involving insect infestation and one each of scombroid, lupin alkaloid and broom tea poisoning and an allergic reaction from beef adulterated with pork were reported. Chemicals implicated in causing illness included tin, rancid compounds, monosodium glutamate and extraneous matter. The deaths of three persons were attributed to salmonellosis and probable mushroom poisoning. About 33% of incidents and 38% of cases were associated with meat and poultry. Vegetables, fruits, bakery products and marine products were also important vehicles in causing foodborne disease. Mishandling of food took place mainly in foodservice establishments (38.9% of incidents, 59.3% of cases) and homes (13.3% of incidents, 7.0% of cases). However, mishandling by manufacturers caused some problems including salmonellosis from a cake and staphylococcal intoxication from canned fish and sausages. Over 53% of reported foodborne disease incidents occurred in Ontario and more than 18% in British Columbia, but the number of incidents per 100,000 population was highest in the Northwest Territories. Narrative reports of selected foodborne incidents are presented. Four waterborne disease outbreaks were reported in 1979 with a total of 73 cases. Lack of adequate water treatment led to the illnesses in at least three of the outbreaks.