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U.S. Influenza Surveillance 2004 - 2005

U.S. Influenza Surveillance 2004 - 2005. Keiji Fukuda Influenza Branch National Center for Infectious Diseases Centers for Disease Control and Prevention. Core Viruses WHO / NRVESS Laboratory System Influenza-like illness Sentinel Provider (SP) System Mortality 122 cities NCHS

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U.S. Influenza Surveillance 2004 - 2005

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  1. U.S. Influenza Surveillance2004 - 2005 Keiji Fukuda Influenza Branch National Center for Infectious Diseases Centers for Disease Control and Prevention

  2. Core Viruses WHO / NRVESS Laboratory System Influenza-like illness Sentinel Provider (SP) System Mortality 122 cities NCHS State activity assessment State & Territorial Epidemiologists Report Changes Underway Current systems Enhancements to SP system New Systems Added Pediatric influenza hospitalizations New Vaccine Surveillance Network Emerging Infections Program Pediatric influenza deaths H5N1 detection in ill travelers Under evaluation Biosense Notifiable diseases, etc. Evolving U.S. Influenza Surveillance

  3. Growth of the Influenza Sentinel Physician Surveillance System * Data as of 1/27/2005

  4. Sentinel Provider System Coverage Map

  5. Visits for Influenza-like Illness to U.S. Sentinel Providers, 2002 - 2005

  6. 2004 – 2005 U.S. Season

  7. Influenza Virus Detections, 2004-05 U.S. WHO/NREVSS Collaborating Laboratories 65,404 specimens tested for influenza viruses 58,286 Negative 7,118 (10.9%) Positive 6,077 (85.4%) influenza A 1,041 (14.6%) Influenza B 1986 (32.7%) subtyped 6 (0.3%) H1 1980 (99.7%) H3N2

  8. U.S. WHO/NREVSS Collaborating LaboratoriesSummary, 2004-05

  9. Visits for Influenza-like Illness to U.S. Sentinel Providers, 2002 - 2005

  10. NVSN Influenza (Lab Confirmed) Hospitalization Rates Children 0 - 4 Years, 2000 - 2005 This graph has been updated from the January 21, 2004 report due to laboratory confirmation of an additional influenza hospitalization between December 26, 2004 and January 8, 2005.

  11. EIP Influenza (Lab Confirmed) Hospitalization Rates Children 0-4 years & 5-17 years, 2003 - 2005

  12. Pneumonia and Influenza Mortalityfor 122 U.S. CitiesWeek Ending 2/05/2005 EpidemicThreshold SeasonalBaseline 2001 2002 2003 2004 20 30 40 50 10 20 30 40 50 10 20 30 40 50 10 20 30 40 50

  13. Weekly Influenza Activity Estimates Reported by State & Territorial Epidemiologists Week ending February 05, 2005 - Week 5 No Report No Activity Sporadic Local Activity Regional Widespread

  14. Conclusion • Moderate impact compared with 2003 • Dominated by A (H3N2) viruses • 6 reported pediatric deaths • Ongoing activity

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