From the Centers for Disease Control and Prevention. Influenza activity--United States, 1992-93.
D004196:Disease Outbreaks; D006801:Humans; D009980:Influenza A virus; D009981:Influenza B virus; D007251:Influenza, Human / Q000453:epidemiology* / Q000382:microbiology; D012621:Seasons; D014481:United States / Q000453:epidemiology