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Flu Choose a Subcategory Flu Basics Flu Treatment Current Topics in Flu Related Topics - Colds - Infectious Diseases Featured Video Flu Overview Video Transcript Most of us are familiar with the symptoms of the flu—fever, chills, fatigue, stuffy nose, sore throat. Most of us know that it is caused by the influenza virus. And we all dread it. But just wha... More Related Topics Choose a related topic below - Colds - Infectious Diseases

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