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CDC: Flu shot less effective this year because current virus has mutated

CDC: Flu shot less effective this year because current virus has mutated

CNN - By Debra Goldschmidt and Jen Christensen, CNN

Scientists are concerned about what they're seeing so far this flu season, the director of the Centers for Disease Control and Prevention said Thursday, a day after the agency advised doctors this year's flu vaccine is not as effective because the current strain of the virus has mutated. Dr. Tom …

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