Aaron Tam / FILE / Getty Images
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Scientists Halt Bird-Flu Research
Sushanta Das / AP Photo
After a mutation made the virus more contagious.
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How Health Reform Would Have Changed History
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Why Future Flu Pandemics May Be Much More Lethal
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Photos: A History of the Flu
Over the past three centuries, the world has seen a flu pandemic every 30 or 40 years.... MORE
