1976: A year of epidemic.
D002170:Canada; D003140:Communicable Disease Control; D003141:Communicable Diseases / Q000453:epidemiology; D004196:Disease Outbreaks / Q000453:epidemiology*; D006801:Humans; D007114:Immunization; D009980:Influenza A virus; D007251:Influenza, Human / Q000517:prevention & control; D010356:Patient Isolation; D014774:Virulence