What is Influenza (flu)?

Influenza, commonly called the flu, is caused by the influenza virus, which infects the respiratory tract (nose, throat, lungs). Unlike many other viral respiratory infections, such as the common cold, the flu causes severe illness and life-threatening complications in many people.

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1. What are the symptoms of the flu?
2. When is the flu season in the United States?
3. How does the flu spread?
4. What is Influenza (flu)?
5. Does the flu have complications?
6. How do I find out if I have the flu?
7. How soon will I get sick if I am exposed to the flu?
8. How long is a person with flu virus contagious?
9. How many people get sick or die from the flu every year?