A method for surveillance of influenza epidemics.
D000328:Adult; D004196:Disease Outbreaks; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data; D004812:Epidemiologic Methods; D006753:Hospital Records; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology*; D009518:New York; D011014:Pneumonia / Q000401:mortality