A new strain of bird flu has infected 130 and killed 40 people in China already this year. 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.
Ralf Manteufel/Wikimedia Commons
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