The flu season is in full swing and reported cases are spreading quickly throughout the U.S. Take a look at history's four main flu outbreaks.
In the spring of 2009, a new flu virus spread quickly across the United States and the world. The first U.S. case of HINI (swine flu) was diagnosed on April 15, 2009.
Library of Congress
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Wisconsin Dept. of Natural Resources
Enrique Castro-Mendivil / Reuters
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