CDC Warning: Flu Viruses Mutate and Evade Current Vaccine

December 4, 2014 3:43 AM

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Much of the influenza virus circulating in the United States has mutated and this year's vaccine doesn't provide good protection against it, federal health officials are warning.

Flu season's barely starting, but most cases are being caused by a strain called H3N2 this year, the Centers for Disease Control and Prevention said in a health warning issued to doctors Wednesday night.

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