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J&J Says Covid-19 Booster Shot Triggered an Antibody Surge

  • Early data show a second injection led to a ninefold increase
  • Company to discuss booster time frame with health officials
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Do Covid Booster Shots Work?
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Johnson & Johnson said a booster of its Covid-19 vaccine provided a rapid and strong increase in antibodies, supporting use of a second shot among people who previously received its single-dose immunization.

A second dose of the J&J vaccine led to a ninefold increase in Covid-fighting antibodies compared with the levels participants had 28 days after getting their first shot, the health-care giant said Wednesday, citing interim data from an early-stage trial.