Correction to: Nature Medicine https://doi.org/10.1038/s41591-021-01563-8, published online 27 October 2021.

In the version of this Article initially published, a versioning error led to a mistake in the third paragraph of the Discussion. In the text now reading “In our dataset, the most extreme and sustained increase in SARS-CoV-2 cases associated with school opening was in the South, where school opening was associated with a weekly increase in cases ranging from 9.8 to 21.3 per 100,000 people,” the range initially reported was “7.8 to 18.9 per 100,000.” The results presented in the text and figures are unaffected.

The change has been made to the online version of the Article.