The flu is a contagious disease caused by the influenza type A, B, and C viruses. It spreads through the air, and can produce high fever, headache, sore throat, non-productive and dry cough, muscle aches, some gastrointestinal problems, and extreme tiredness. More than 200,000 persons are hospitalized in the US each year due to flu.
Author(s): Deanne Erdmann, MS, and Nancy Moreno, PhD
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