Correction to: Nature Structural & Molecular Biology https://doi.org/10.1038/s41594-020-0469-6, published online 13 July 2020.

In the version of this article initially published, the PDB accession code for the H11-H4–RBD X-ray crystal structure was incorrect. The correct accession code is 6ZBP. The error has been corrected in the HTML and PDF versions of the article.