CDC: Flu vaccine has 'reduced' effectiveness this year

January 16, 2015 2:18 PM

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Atlanta – This year's flu vaccine has just a 23 percent effectiveness, according to a report released Thursday by the Centers for Disease Prevention and Control.

The CDC explained that one of the causes of the reduced effectiveness is that about 70 percent of the H3N2 viruses, the strain that has predominated so far during the 2014-2015 flu season, are different or have changed with respect to what is included in the vaccine.

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