What is influenza (the flu)?
Influenza is a contagious disease that is caused by the influenza virus. It affects the respiratory tract in humans (nose, throat, and lungs). Influenza is different from a cold and can range from mild to severe illness, and can lead to death.

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1. What is influenza (the flu)?
2. What are the symptoms of influenza?
3. What are some complications of influenza?
4. How is the influenza virus spread from one person to another?
5. Is influenza contagious?
6. What should I do if I get the flu?
7. How do you keep from getting the flu?