Update: influenza activity United States, 2004-05 season.
Influenza activity has increased steadily in the United States since late December and, as of February 19, might not have peaked. Laboratory-confirmed influenza infections have been reported from all 50 states. This report summarizes influenza activity during October 3, 2004-February 19, 2005.
D006801:Humans; D009980:Influenza A virus; D009981:Influenza B virus; D007251:Influenza, Human / Q000453:epidemiology*; D011159:Population Surveillance; D012621:Seasons; D014481:United States / Q000453:epidemiology