How do I find out if I have the flu?

It is very difficult to distinguish the flu from other viral or bacterial causes of respiratory illnesses on the basis of symptoms alone. A test can confirm that an illness is influenza if the patient is tested within the first two to three days after symptoms begin. In addition, a doctor's examination may be needed to determine whether a person has another infection that is a complication of influenza.

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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?