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Infectious disease expert explains why this year's flu virus is so deadly

Health workers are facing a huge challenge in trying to contain this season's flu outbreak. It's the most widespread in recent years, with at least 37 child deaths reported so far. The biggest clusters are in the South and West. Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, joins "CBS This Morning" from the NIH headquarters to discuss the importance of getting vaccinated and why it's so difficult to create a universal vaccine.
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