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 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.
Library of Congress
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iStock / LawrenceSawyer
Wisconsin Dept. of Natural Resources
Enrique Castro-Mendivil / Reuters
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