In a phase 2/3 study, Sanofi-GSK’s next-generation COVID-19 vaccine booster resulted in 76.1 percent of participants seeing at least a tenfold increase in neutralizing antibody titers. Pfizer’s booster and Sanofi-GSK’s first-generation vaccine trailed behind at 63.2 percent and 55.3 percent, respectively, according to the June 13 press release.
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