Answers are grounded in this paper and cite their sources.
Covid-19: Infections fell by 65% after first dose of AstraZeneca or Pfizer vaccine, data show Gareth IacobucciInfections of SARS-CoV-2 fell by 65% after a first dose of the Oxford-AstraZeneca or Pfizer-BioNTech vaccines, preliminary results from a large UK surveillance study indicate.Reductions increased to 70% after a second dose of the Pfizer vaccine, data from the UK Covid-19 Infection Survey show.Not enough people had yet received two doses of the AstraZeneca vaccine to assess this.
No takes yet. Share an insight, caveat, or question.
Gareth Iacobucci (2021) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: