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

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Presentation transcript:

U.S. Influenza Surveillance Ann Moen Influenza Branch NCID/CDC

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

WHO/NREVSS Collaborating Laboratories National Summary,

The Viruses: Influenza Season Week ending February 7, 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

Percentage of Specimens Testing Positive for Influenza National Summary,

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

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

Pneumonia and Influenza Mortality for 122 U.S. Cities Week Ending 02/07/ Epidemic Threshold Seasonal Baseline

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

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 –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

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

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

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

Summary of the Influenza Season