Correction to: Nature https://doi.org/10.1038/s41586-021-03234-7Published online 25 January 2021

In this Article, in the Methods section ‘Patients, participants, severity score and clinical data collection’, the word ‘mild–moderate’ should be replaced by ‘severe’ in the sentence ‘Patients classified as … (typically five days or more).’. The corrected sentence should read: ‘Patients classified as having severe disease are patients who required intensive care and mechanical ventilation (typically five days or more).’. The Article has been corrected online.