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Pfizer-BioNTech Booster Shot Restores Full Covid Protection

  • Trial was run in period when delta was dominant Covid strain
  • Results may strengthen case for giving third doses more widely
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Boosters Could Help Long-term Covid Immunity: Johns Hopkins
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Pfizer Inc. and BioNTech SE said a booster shot of their Covid-19 vaccine restored full protection in a large study, results that are likely to bolster the argument for giving a third dose more widely.

A booster was 95.6% effective against symptomatic Covid in the study, which followed 10,000 people aged 16 and older, the companies said in a statement Thursday. The fast-spreading delta variant was the predominate strain during the trial.