History of flu outbreaks

Published On: Jan 10 2013 09:47:55 AM PST   Updated On: Dec 18 2013 08:05:56 AM PST

The first human has died from the H10N8 avian flu virus, which has only been detected in birds until now. Take a look at history's four main flu outbreaks.

Spanish Flu Fort Riley
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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.

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