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How the flu becomes deadly

The CDC says there may be signs flu activity is leveling off, but the threat is far from over. The most severe flu season in nearly a decade has taken a heavy toll, killing 84 children. About three-quarters of them were not vaccinated. Dr. Tara Narula shows how the the virus can quickly turn deadly.

Read more: http://www.cbsnews.com/video/how-the-flu-becomes-deadly/

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