CNN |
Flu vaccine just 36% effective this season, CDC reports
CNN (CNN) Flu season is still raging in the United States, yet already it ranks among the most difficult in recent years. One reason: This year's vaccine has been just 36% effective against both A and B virus strains, the US Centers for Disease Control and ... Flu shot only 36 percent effective overall, 25 percent against most common strain 2018 Flu update: Flu shot did not prevent woman's death US officials warn 'intense' flu season to continue, urge shots |
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