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  • Ringman

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    Pfizer to ask FDA to authorize booster dose of COVID vaccine as Delta variant spreads

    Dolsten said that early data from the company's own studies shows that a third booster dose generates antibody levels that are five to 10-fold higher than after the second dose, suggesting that a third dose will offer promising protection.

    Pfizer plans to launch soon a placebo-controlled efficacy trial of the booster with 10,000 participants. That study will run throughout the fall, Dolsten said, meaning it will not be completed ahead of the company's filing with the Food and Drug Administration.

    Dr. Eric Topol, a professor of molecular medicine and director of the Scripps Research Translational Institute in La Jolla, California, said basing the decision on waning antibody protection ignores the role of important other parts of the immune response, including memory B cells, which can make antibodies on demand when challenged by the virus.

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    Dolsten also said Pfizer and BioNTech are designing a new version of the vaccine targeting the Delta variant, but said the companies do not believe that the current version will need to be replaced in order to combat the variant.

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