From the Centers for Disease Control and Prevention. Update: influenza activity--United States, 1998-99 season.
D006801:Humans; D009980:Influenza A virus; D009981:Influenza B virus; D007251:Influenza, Human / Q000453:epidemiology* / Q000821:virology; D012621:Seasons; D014481:United States / Q000453:epidemiology