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CDC: Flu shot only 23 percent effective
CDC: Flu Vaccine Only 23 Percent Effective
Concerns After CDC Says Flu Vaccine Only 23 Percent Effective
This season's flu vaccine is only 23% effective
FILE- CDC REPORT SAYS FLU SHOT 23% EFFECTIVE
CDC: Flu Shot Reduces Hospital Risk By 23%
Flu shot only 23% effective, still recommended
Flu vaccine only 23 percent effective
CDC announce flu vaccine effectiveness this season
Why The CDC Just Declared A Flu Epidemic
The Flu Vaccine is Effective
Don't Lose Faith in the Flu Vaccine