+Flu, or influenza, is a common acute [Respiratory illness](/wiki/respiratory_illness). It is caused by [Influenza viruses](/wiki/influenza_virus), bringing sudden fever, cough, and body aches, and can lead to serious complications.
+## See also
+- [Common Cold](/wiki/common_cold)
+- [Vaccine](/wiki/vaccine)
+- [Pandemic](/wiki/pandemic)
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