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.
The Spanish flu came on quickly. Some people felt fine in the morning but died by nightfall. People who caught the Spanish Flu but did not die from it often died from complications caused by bacteria, such as pneumonia.
Wisconsin Dept. of Natural Resources
Enrique Castro-Mendivil / Reuters
Gene Blevins / Reuters
Patrick T. Fallon/Reuters
Larry Downing / Reuters
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