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NIAID animation explains the ever-changing nature of influenza viruses.

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View a list of links for more information about influenza.

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Flu (Influenza): 2009 H1N1, Seasonal, Avian (Bird), Pandemic

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Understanding Flu
The Flu Types—Seasonal, Pandemic, Avian (Bird), Swine
Key Facts About Seasonal Flu
How Flu Spreads
Symptoms
What To Do If You Get Sick
Preventing Seasonal Flu
Seasonal Flu Vaccine
Publications

NIAID's Role in Influenza Research

Each year in the United States, seasonal influenza kills more than 36,000 people and hospitalizes 200,000 more. NIAID scientists worldwide are working together to find better ways to prevent, diagnose, and treat seasonal and pandemic influenza, including H1N1 flu. For the latest in NIAID-supported influenza research, see Recent Scientific Findings and H1N1 Influenza (Swine Flu).