The mean season: Influenza strains this year virulent and not fully covered by vaccine

December 16, 2014 2:56 AM

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Nurse Shajaira Powell-Bailey measures out a vaccination at a Florida elementary school. Vaccines, not as effective this year against circulating strains, are still the best defense, the state health department and CDC say.

The cost common flu strain this year in Colorado is influenza A, or H3N2 virus, which is a severe one.

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