Correction to: Nature Reviews Immunology https://doi.org/10.1038/s41577-021-00525-y, published online 03 March 2021.

There was an error in the third paragraph of text of this Comment article, which incorrectly stated that “53 pregnancies occurred across the trials of the three vaccines that have so far been approved in the UK”; the actual number of pregnancies is 57 and this has now been corrected online.