What are the symptoms of influenza?

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The symptoms of influenza include sudden and distinct chills, fatigue, and muscle aches. A person’s body temperature rises rapidly to 38–40 °C (101–104 °F). There are diffuse headaches and severe muscular aches accompanied by irritation or a sense of rawness in the throat. Symptoms associated with respiratory tract infection become more prominent, accompanied by lingering feelings of weakness.

What is the difference between influenza epidemics and influenza pandemics?

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Pandemics are worldwide outbreaks of a disease and are estimated to occur on average once every 50 years for influenza. Epidemics happen much more frequently, and seasonal influenza appears annually in most parts of the world. The influenza pandemic of 1918–19 is the most destructive influenza outbreak in history. It resulted in an estimated 25 million deaths globally.