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U.S. Influenza Surveillance 2003-2004 Ann Moen Influenza Branch NCID/CDC.

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Presentation on theme: "U.S. Influenza Surveillance 2003-2004 Ann Moen Influenza Branch NCID/CDC."— Presentation transcript:

1 U.S. Influenza Surveillance 2003-2004 Ann Moen Influenza Branch NCID/CDC

2 U.S. Influenza Surveillance CDC Laboratories Sentinel Providers State and Territorial Epidemiologists Vital Statistics Registrars Other Public Health Officials PhysiciansMedia Public Health Departments

3 WHO/NREVSS Collaborating Laboratories National Summary, 2003-04

4 The Viruses: 2003-04 Influenza Season Week ending February 7, 2004- week 5 Total specimens tested by WHO and NREVSS laboratories in the U.S. = 92,159 Total positive for influenza = 22,419 (24.3%) Influenza A = 22,286 (99.4%) Influenza B = 133 Total subtyped = 5,862 (26.3%) A(H3N2)= 5,861 (99.9%) and A(H1)=1 Subset characterized at CDC

5 Percentage of Specimens Testing Positive for Influenza National Summary, 2003-04

6 Percentage of Visits for Influenza-like Illness Reported by Sentinel Providers National Summary, 2003-04

7 U.S. Sentinel Providers Reporting Summary as of February 13, 2004 1931 SPs enrolled 1141 regularly reporting 19,727 reports received (19 weeks) 5,581,022 patient visits recorded 169,919 reports of ILI

8 Pneumonia and Influenza Mortality for 122 U.S. Cities Week Ending 02/07/04 20002001 2002 2003 Epidemic Threshold Seasonal Baseline 10 20 30 40 50 10 20 30 40 50 10 20 30 40 50 10 20 30 40 50

9 No Report Sporadic Regional Widespread No Activity Local Activity Weekly Influenza Activity Estimates Reported by State & Territorial Epidemiologists Week ending October 4, 2003 - Week 40

10 Changes in Activity Reports from State & Territorial Epidemiologists Previous Years –4 levels of activity None, sporadic, regional, widespread –Based on percentage of population & counties –Criteria used either outbreaks of culture confirmed influenza or ILI 2003-2004 –5 levels of activity None, sporadic, local, regional, widespread –Based on state defined regions –Defined criteria uses combination of ILI/outbreaks and laboratory data –Specified time frames for lab confirmation

11 Weekly Influenza Activity Estimates Reported by State & Territorial Epidemiologists Week ending December 20, 2003 - Week 51 No Report Sporadic Regional Widespread No Activity Local Activity

12 Peak of Influenza Activity as Reported by State & Territorial Epidemiologists – 1999-2000 Season Week ending January 15, 2000 - Week 2 No Report Sporadic Regional Widespread No Activity

13 Peak of Influenza Activity as Reported by State & Territorial Epidemiologists – 2002-03 Season Week ending March 1, 2003 - Week 9 No Report Sporadic Regional Widespread No Activity

14 Summary of the 2003-04 Influenza Season

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