This seems to indicate that a Pfizer vaccination is better than having Covid previously: https://www.ox.ac.uk/news/2021-08-19-vaccines-still-effective-against-

This seems to indicate that a Pfizer vaccination is better than having Covid previously: https://www.ox.ac.uk/news/2021-08-19-vaccines-still-effective-against-delta-variant-concern-says-oxford-led-study-covid-0 https://www.ox.ac.uk/news/2021-08-19-vaccines-still-effectiv... Pfizer reduced rates by 82% whereas a Covid infection reduced rates by 73%. >Fourteen days after a second dose of Oxford-AstraZeneca or Pfizer-BioNTech, rates had dropped by 67% and 82% respectively. In comparison, people who had not been vaccinated but had had COVID-19 before had rates which were 73% lower than unvaccinated individuals