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The flu is a respiratory infection caused by flu viruses. The viruses pass through the air and enter your body through your nose or mouth. It can also be acquired from contaminated surfaces.

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The orthomyxoviruses (influenza viruses) constitute the genus Orthomyxovirus, which consists of three types (species): A, B, and C. Also known as the flu

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This includes people 65 years and older, people of any age with certain chronic medical conditions (such as asthma, diabetes, or heart disease), pregnant people, and children younger than 5 years.

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Antiviral drugs can help treat flu illness: Antiviral drugs are different from antibiotics. Flu antivirals are prescription medicines (pills, liquid, intravenous solution, or an inhaled powder) and are not available over the counter. Antiviral drugs can make illness milder and shorten the time you are sick.

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Complications of flu can include bacterial pneumonia, ear infections, sinus infections and worsening of chronic medical conditions, such as congestive heart failure, asthma, or diabetes.