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.
Unlike earlier pandemics and seasonal flu outbreaks, the 1918 pandemic flu saw high mortality rates among healthy adults. In fact, the illness and mortality rates were highest among adults 20 to 50 years old. The reasons for this remain unknown.
Wisconsin Dept. of Natural Resources
Enrique Castro-Mendivil / Reuters
Gene Blevins / Reuters
Patrick T. Fallon/Reuters
Larry Downing / Reuters
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