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Nightly News
Why This Year's Flu Vaccine May Not Work for You
Catch up with NBC News Clone on today's hot topic: Why This Years Flu Vaccine May Not Work For You 367373379804 - Breaking News | NBC News Clone. Our editorial team reformatted this story for clarity and speed.
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The CDC warned today that a strain of the flu virus mutated this year, making the current vaccine less effective.Dec. 5, 2014
