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Influenza, commonly called the flu, is a contagious respiratory illness caused by influenza viruses. It spreads through droplets when infected individuals cough or sneeze, affecting the nose, throat, and lungs. Symptoms include fever, cough, sore throat, fatigue, and body aches. Most people recover in a week, but serious cases can cause complications. Annual flu vaccination, proper hygiene, and early medical care are essential to prevent influenza and stay healthy during flu season.