Half-dose Pfizer COVID booster nearly as effective as full dose with fewer side effects

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Study compares the half-dose and full-dose Pfizer-BioNTech BNT162b2 COVID-19 booster in adults previously vaccinated with ChAdOx1, BBIBP-CorV, or Gam-COVID-Vac. It finds that the half-dose booster has fewer side effects and maintains similar immunogenicity, offering a viable option for booster vaccination strategies.