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.
By April 21, the Centers for Disease Control and Prevention (CDC) was working to develop a vaccine for this new virus. On April 26, the U.S. government declared H1N1 a public health emergency.
Keystone Resort/Ben Lindbloom
Jessica Rinaldi / Reuters
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