Single-dose Oxford–AstraZeneca COVID-19 vaccine followed by a 12-week booster


Vaccines to prevent COVID-19 infection are crucial for an effective global pandemic response. In The Lancet, Merryn Voysey and colleagues

  • Voysey M
  • Costa Clemens SA
  • Madhi SA
  • et al.
Single dose administration and the influence of the timing of the booster dose on immunogenicity and efficacy of ChAdOx1 nCoV-19 (AZD1222) vaccine: a pooled analysis of four randomised trials.