Map: Weekly Influenza Activity Estimates Reported by State and Territorial Epidemiologists (Activity levels indicate geographic spread of both seasonal and 2009 influenza A [H1N1] viruses) (Posted December 24, 2009, 2:30 PM ET, for Week Ending December 19, 2009) -- Percentage of Visits for Influenza-like Illness (ILI) Reported by the U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet), National Summary 2008-2009 and Previous Two Seasons (Posted December 18, 2009, 3:30 PM ET, for Week Ending December 12, 2009) -- U.S. Laboratory Confirmed Influenza-Associated Hospitalizations and Deaths from August 30 to December 12, 2009 : Posted December 18, 2009, 11:00 AM ET : Data reported to CDC by December 15, 2009, 12:00 AM ET -- U.S. Influenza-associated Pediatric Mortality : Posted December 18, 2009 (Updated each Friday) : Data reported to CDC by December 12, 2009.

Stephen B. Thacker CDC Library collection