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COVID-19 tracker: UK study finds strong responses 84 days after booster shot

A U.K.-wide study found prolonged “strong immune responses” 84 days after participants received a booster COVID-19 shot. The study, led by the University Hospital Southampton (UHS) and published in the Journal of Infection, tested immune responses after seven different vaccines used as a boosters 28 days after receiving two doses of AstraZeneca or Pfizer vaccines. While different initial vaccines yielded different results from the booster, “the rate that immune cell responses declined after third doses was similar between all the vaccine combinations and doses,” according to a UHS spokeswoman quoted in the Evening Standard. The study also found that a half dose of Pfizer’s vaccine prompts similar responses to a full dose at three months, which could “help in planning global vaccine supply and delivery,” according to Saul Faust, a professor of pediatric immunology and infectious diseases at the University of Southampton and director of the NIHR Southampton Clinical Research Facility.

FiercePharma - April 21, 2022

View the full story here: https://www.fiercepharma.com/pharma/covid-19-tracker-pfizer-targets-variant-specific-vaccines-fall