U.S. Food and Drug Administration
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Flu Information

General Information

Influenza, commonly called the flu, is an infection of the respiratory tract caused by the influenza virus. Signs of the flu include sudden onset of headache, chills, and feeling generally miserable. Respiratory symptoms like nasal congestion, cough and sore throat appear, and the flu sufferer often experiences extreme fatigue and muscle aches in the back and legs. Fever between 100 and 103 degrees Fahrenheit is typical in adults, and is often even higher in children.

Flu Facts

Flu Vaccine Shortage

Prevention and Treatment

Vaccines

Drugs


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