The flu vaccine has not been a great a match for the predominant viruses this season, preliminary data from the US Centers for Disease Control and Prevention shows — but the season isn’t over, and the estimate could change.
The vaccine was only about 16 percent effective at reducing a person’s chance of getting a mild or moderate infection, the agency said. Experts said a good rate would be at least 50 percent.
Read more at nytimes.com
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