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Pfizer Says Booster Shots of Vaccine Restore Waning Immunity

  • Presentation for FDA meeting details waning shot effectiveness
  • FDA staff makes no recommendation on clearing third dose
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Pfizer Points to Waning Immunity in Need for Booster Shots
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Pfizer Inc. said that data from the U.S. and Israel suggest that the efficacy of its Covid-19 vaccine wanes over time, and that a booster dose was safe and effective at warding off the virus and new variants.

The company detailed the data in a presentation it will deliver to a meeting of outside advisers to the Food and Drug Administration on Friday. The panel is expected to make recommendations for whether more Americans should receive booster shots.