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特許 係属中 Influenza, commonly known as "the flu", is an infectious disease caused by the influenza virus.[1] Symptoms can be mild to severe.[2] The most common symptoms include: a high fever, runny nose, sore throat, muscle pains, headache, coughing, and feeling tired. These symptoms typically begin two days after exposure to the virus and most last less than a week. The cough, however, may last for more than two weeks.
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