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.
Most influenza–and pneumonia–related deaths occurred between September 1957 and March 1958. Although the 1957 pandemic was not as devastating as the 1918 pandemic, about 69,800 people in the United States died. The elderly had the highest rates of death.
Ralf Manteufel/Wikimedia Commons
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