Information about the 2009 H1N1 Virus
This website is archived for historical purposes and is no longer being maintained or updated. For updated information on the current flu season, see the CDC Seasonal Flu website.
November 25, 2009 10:00 AM ET
- Origin of the 2009 H1N1 Virus: Questions and Answers
- Reports of Small Changes to Some 2009 H1N1 Viruses: Questions & Answers
- Images of the 2009 H1N1 Influenza Virus
- General Information About Influenza Viruses
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