History of flu outbreaks

POSTED: 09:47 AM PST Jan 10, 2013    UPDATED: 08:05 AM PST Dec 18, 2013 

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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