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Flu vaccine makers have to guess nearly a year in advance, which strains of flu viruses will hit before creating their formula.
This year it appears they guessed wrong.
The Center for Disease Control is blaming the severity of this year's flu outbreak in part on mutated strains of flu that were not anticipated when the flu vaccine was formulated last year. Officials said 40 percent to 50 percent of cases presenting with flu this year had taken the flu shot.
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