Correction to: Nature Medicine https://doi.org/10.1038/s41591-020-01194-5, published online 17 December 2020.

In the version of this article initially published, the following names were missing from the author list for the Oxford COVID Vaccine Trial Group: Francesca R. Donnellan, Giacomo Gorini, Gaurav Gupta, Nathifa Moya, Ekta Mukhopadhyay, Fay L. Nugent, Stephannie Salvador, Iman Satti and Iona Jennifer Taylor (all at affiliation 1); Carla Ferreira Da Silva, Natalie G. Marchevsky, Daniel Phillips, Christine S. Rollier, Lisa Stockdale, Adriana Tomic and Marije K. Verheul (all at affiliation 2); Miles W. Carroll (at affiliation 7); and Annina Schmid (at affiliation 9). Also, two author names (Rachel Varughes and Gary Mallett) were incorrect; the correct names are ‘Rachel Varughese’ and ‘Garry Mallett’ (respectively). The errors have been corrected in the HTML and PDF versions of the article.