provides a comprehensive look at the who,
what, when and how of Influenza
< b>Influenza: The flu is caused by viruses that infect the respiratory tract
which are divided into three types, designated A, B, and C. Most people who get
the flu recover completely in 1 to 2 weeks, but some people develop serious and
potentially life-threatening medical complications, such as pneumonia. Much of the
illness and death caused by influenza can be prevented by annual influenza vaccination.
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