Update: Influenza activity--US and worldwide, 2004-2005 season.
D002487:Centers for Disease Control and Prevention, U.S.; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D009980:Influenza A virus; D009981:Influenza B virus; D007251:Influenza, Human / Q000453:epidemiology* / Q000821:virology; D011159:Population Surveillance; D012621:Seasons; D014481:United States / Q000453:epidemiology