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 summer of 1957, the virus came to the United States quietly with a series of small outbreaks. When children returned to school in the fall, they spread the disease in classrooms and brought it home to their families.
Keystone Resort/Ben Lindbloom
Jessica Rinaldi / Reuters
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