Many different viruses can cause influenza, or flu, a contagious illness of the respiratory tract. ...
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Many different viruses can cause influenza, or flu, a contagious illness of the respiratory tract. Flu is spread through the air when an infected person coughs or sneezes, or by touching things infected with the virus and then touching your mouth or nose. An infected person can spread the virus before symptoms develop. Typical symptoms of influenza: Fever (100 to 103 degrees Fahrenheit in adults; may be higher in children) Respiratory symptoms such as Cough Sore throat Runny or stuffy nose Muscle aches Fatigue, sometimes extreme Like all other viruses, influenza cannot be controlled with antibiotics like penicillin, which kills bacteria. Flu shots are reformulated each year based on the type of virus expected to be most common. The vaccine offers some protection once antibodies develop, approximately 2 weeks after the shot.

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