Influenza (the flu) is a contagious disease that is caused by the influenza virus. It attacks the respiratory tract in humans (nose, throat, and lungs). The flu is different from a cold. The flu usually comes on suddenly and may include these symptoms:
Fever
Headache
Tiredness (can be extreme)
Dry cough
Sore throat
Nasal congestion
Body aches
These symptoms are usually referred to as "flu-like symptoms."
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