Officials generally are pleased if a flu vaccine is 40% to 60% effective.
The shots tend to do better when they are well matched against the circulating flu strains. Officials say that’s what’s happened during this — relatively typical — flu season.
The recommendation was approved by CDC Director Mandy Cohen, allowing the United States to join Canada and the United Kingdom in offering a spring booster this year to people at high risk of severe disease if they contract Covid.
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