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Health researchers keep learning lessons from a flu pandemic that struck almost 100 years ago. The flu of 1918 killed 50 million people worldwide, including 600,000 Americans.
The infection also spread to about a third of the world's population — an enormous number of people. But it didn't make everyone equally sick. Healthy, young soldiers succumbed to this flu virus. Toddlers and people in their 80s survived it.
Now, researchers from the University of Arizona have published a report that sheds light on who died from the flu and why.
This segment aired on April 29, 2014.