Correction to: Nature Biotechnology https://doi.org/10.1038/s41587-020-0732-8, published online 21 October 2020.

In the version of this article initially published, LY-CoV555 was described in the introductory paragraph as a cocktail of two mAbs. It is a single mAb. The error has been corrected in the PDF and HTML versions of the article.