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For more information, see: Wikipedia | MayoClinic
Influenza – Flu
Commonly called “The Flu”. Influenza: Several influenza epidemics in the 20th century caused millions of deaths worldwide, including the worst epidemic in American history, the Spanish influenza outbreak that killed more than 500,000 in 1918. Today influenza is less of a public health threat, though it continues to be a serious disease that affects many people. Approximately 20,000 people die of the flu in the United States every year. The influenza virus attacks the human respiratory tract, causing symptoms such as fever, headaches, fatigue, coughing, sore throat, nasal congestion, and body aches.
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For more information, see: Wikipedia | MayoClinic
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