title: Update: influenza activity--United States, September 30, 2007-April 5, 2008, and composition of the 2008-09 influenza vaccine.
abstract: This report summarizes U.S. influenza activity since September 30, 2007, the start of the 2007-08 influenza season, and updates the previous summary. Low levels of influenza activity were reported from October through early December. Activity increased from mid-December and peaked in mid-February.
mesh_terms: D006801:Humans; D009980:Influenza A virus / Q000276:immunology / Q000302:isolation & purification*; D009981:Influenza B virus / Q000276:immunology / Q000302:isolation & purification*; D007252:Influenza Vaccines / Q000008:administration & dosage; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control* / Q000821:virology; D011159:Population Surveillance; D012621:Seasons; D014481:United States / Q000453:epidemiology
chemical_list: D007252:Influenza Vaccines