Parasitic disease in humans: the extent in Canada.

Much is being said, often dramatically, about the potential hazards of parasitic diseases in Canada, but little or no attempt has been made to determine the true extent of the problem. Indigenous parasite pathogens are recognized in resident Canadians, and pathogens are acquired by travellers abroad or reported from immigrants. The role of each of these categories is important in the characterization of the problem of parasitic diseases in Canada. From data provided by provincial laboratories and hospitals it is estimated that 1 person in 1000 will spend 1 day per year in hospital because of intestinal parasites, and 1 in 100 each year will have a diagnosis of intestinal parasitic infection made from examination of a stool sample.