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Why another flu pandemic is likely just a matter of when

Trending story found on www.pbs.org
Why another flu pandemic is likely just a matter of when
Despite the availability of vaccines, the flu still kills tens of thousands of people in the U.S. each year, and hundreds of thousands more worldwide. But public health officials fear that an even graver threat lies ahead: the emergence of a new, much more deadly flu virus. As William Brangham reports, the scenario has occurred before.
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