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.

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istock

By April 21, the Centers for Disease Control and Prevention (CDC) was working to develop a vaccine for this new virus. On April 26, the U.S. government declared H1N1 a public health emergency.

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