From the Centers for Disease Control and Prevention. Update: influenza activity--United States, 1998-99 season.
D002140:California / Q000453:epidemiology; D003428:Cross Infection / Q000453:epidemiology*; D004196:Disease Outbreaks; D006801:Humans; D009980:Influenza A virus; D007251:Influenza, Human / Q000453:epidemiology*; D012112:Residential Facilities / Q000706:statistics & numerical data*; D012621:Seasons; D014481:United States / Q000453:epidemiology