This study of 370,000+ participants suggests both AZ and Pfizer seem to produce good protection after a single dose https://www.ox.ac.uk/news/2021-04-23-signif

This study of 370,000+ participants suggests both AZ and Pfizer seem to produce good protection after a single dose https://www.ox.ac.uk/news/2021-04-23-significant-reductions-covid-19-infections-found-after-single-dose-oxford https://www.ox.ac.uk/news/2021-04-23-significant-reductions-...