Between 1951 and January 1972 listeriosis was diagnosed bacteriologically in 101 Canadian patients. This study adds 80 cases to the 21 reported from Metropolitan Toronto by Sepp and Roy in 1963. The Laboratory Centre for Disease Control, Ottawa, collated epidemiological and clinical data. Serotypes of Listeria monocytogenes included 4b (53), 1 (15), 1b (6), 1a (2), 2 and 3. Clinically, 54 patients had meningitis and 23 septicemia. The mortality rate was 30%.Between 1954 and January 1972 listeriosis affected 15 British Columbian patients: nine were male and six female; 12 were less than 1 or more than 45 years old. Among the patients were a pregnant mother and the son to whom she gave premature birth. A day-old infant and an elderly man died.
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