The original version of this Article contained errors, where a study participant was omitted in the mild COVID- 19 experimental group for “bulk” analysis. As the result, in the Results, under ‘A clinical cohort to study early COVID-19 with mild or moderate symptoms’, “Subjects with mild symptoms exhibited a mean score of 12.9 ± 2.1 and 12.2 ± 2.8 for total PBMC assays (bulk) and assays of individual PBMCs (single-cell assays), respectively, which corresponded to the World Health Organization (WHO) Ordinal 8-point scale 1 (OS1, ambulatory and with no limitation of activities).” now reads: “Subjects with mild symptoms exhibited a mean score of 12.8 ± 1.9 and 12.2 ± 2.8 for total PBMC assays (bulk) and assays of individual PBMCs (single-cell assays), respectively, which corresponded to the World Health Organization (WHO) Ordinal 8-point scale 1 (OS1, ambulatory and with no limitation of activities).” In Table 1, in column ‘Mild disease’, the ’Number of subjects’, ’Sex (male/female)’ and ‘Max severity score (± SE)’ have been corrected. The correct and incorrect values are listed below. Incorrect: (Table presented.) Correct: (Table presented.) Additionally, the same error occurred in Supplementary Information Figure S1 and Supplementary Table S1. The original Supplementary Figure S1 and accompanying legend appear below. A new row has been added to Table S1. It now reads: (Table presented.) The original Article and Supplementary Information files have been corrected.