The epidemiology of influenza in Canada, 1977-78.
D002170:Canada; D006801:Humans; D009980:Influenza A virus / Q000276:immunology; D007251:Influenza, Human / Q000453:epidemiology* / Q000276:immunology / Q000401:mortality; D009313:National Health Programs; D011159:Population Surveillance; D012621:Seasons