Influenza season overview health and human resources subpanel meeting april 2012
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Influenza Season Overview: Health and Human Resources Subpanel Meeting, April 2012. David H. Trump, MD, MPH State Epidemiologist Director, Office of Epidemiology. Influenza Surveillance Refresher.

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Influenza season overview health and human resources subpanel meeting april 2012

Influenza Season Overview:Health and Human Resources Subpanel Meeting, April 2012

David H. Trump, MD, MPH

State Epidemiologist

Director, Office of Epidemiology


Influenza surveillance refresher
Influenza Surveillance Refresher

  • VDH Office of Epidemiology tracks the following key indicators to establish the statewide influenza activity level each week

    • Visits to emergency departments and urgent care centers for influenza-like illness (ILI)

      • ILI = fever with cough and/or sore throat

    • Laboratory test results confirming influenza

    • Outbreaks


2011 2012 influenza season
2011-2012 Influenza Season

  • Late, short, and mild

    • Virginia and U.S.

    • Compared to past 15 flu seasons

  • Late – reached widespread level (affecting majority of regions of the state) week of February 25, 2012

    • The latest time in the seasons studied

  • Short – stayed at widespread for only 3 weeks

    • Average of 9 weeks at widespread in 14 seasons (excluding May-December 2009 pandemic period)

  • Mild – highest percent of visits for ILI only 2%; only 4 confirmed outbreaks

    • Peak ILI 5% in 2010-2011; 33 outbreaks in 2011




Vaccine composition for 2012 2013
Vaccine Composition for 2012-2013 Viruses Cause ILI

  • Composition has been identical for past two seasons

  • WHO and FDA recommend changes for next season’s vaccine

    • A/California/7/2009-like (2009 H1N1) – same

    • A/Victoria/361/2011-like (H3N2) – change

    • B/Wisconsin/1/2010-like (B/Yamagata lineage) – change

  • Recommendation based on surveillance on circulating viruses, serological responses to 2011-2012 trivalent seasonal vaccines, and availability of candidate strains and reagents


Who surveillance for influenza a h5n1 avian flu
WHO Surveillance for Influenza A/H5N1 (Avian flu) Viruses Cause ILI

  • 600 cases since 2003 (as of 4/5/2012)

  • 353 (58.8%) have died

  • 2012

    • 22 cases, 13 deaths

    • Bangladesh, Cambodia, China, Egypt, Indonesia,Viet Nam

  • Cases associated with exposure to sick or dead poultry or to live bird markets

  • Spread to household or community contacts not being seen


Conclusion
Conclusion Viruses Cause ILI

  • Influenza continues to behave unpredictably

  • Relatively mild season in U.S. this year

  • Circulating viruses matched vaccine strains

  • WHO continues to actively monitor avian influenza

  • Surveillance, vaccine, and vigilance are necessary for influenza control


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