Influenza or the seasonal flu is a highly infectious acute viral infection caused by the influenza virus. It affects mainly the nose, throat, bronchial tubes, and occasionally the lungs. The symptoms may last from a few days to a week and a person generally improves without any active treatment. It can become extremely severe and may even be life-threatening, especially in people at risk such as the elderly, very young children, or those with certain medical conditions like HIV/AIDS.
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