On Apr. 23, 2021, University of Oxford data from the COVID-19 Infection Survey was the first to show the impact of vaccination on antibody responses and new infections in a large group of adults from the general population aged 16 years and older. The study showed that COVID-19 infections fell significantly ﾖ by 65% percent – after a first dose of the Oxford-AstraZeneca or Pfizer-BioNTech vaccines.

The COVID-19 Infection Survey was the largest longitudinal community survey of SARS-CoV-2 infection at national and regional levels in the UK, using data from a representative sample (over 400,000 individuals aged 2 and older) in England, Wales, Northern Ireland and Scotland.