Influenza, commonly known as the flu, is a contagious respiratory illness caused by influenza viruses. These viruses primarily infect the nose, throat, and sometimes the lungs, leading to a range of symptoms that can vary in severity. Most individuals experience symptoms such as fever, cough, sore throat, body aches, headaches, chills, and fatigue. In some cases, particularly among vulnerable populations such as young children, the elderly, and individuals with pre-existing health conditions, influenza can lead to severe complications, including pneumonia, hospitalization, and even death.
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