Fig. 4.

NK cell expressing inhibitory receptors are expanded in COVID-19 patients. Summary results of median percentage (a), absolute numbers (b), and MFI (c) of NK expressing the 2DL1 and ILT2 inhibitory KIR receptors in SARS-CoV-2-uninfected healthy controls (white bar) and in convalescent COVID-19 patients who suffered from mild (light gray bar), moderate (gray bar), or severe (black bar) disease. The percentage of NK cell percentage expressing the 2DL1 (d) and ILT2 (e) inhibitory KIR receptors are also shown. The boxes stretch from the 25th to the 75th percentile. The lines across the boxes indicate the median values. The lines stretching from the boxes indicate extreme values. Statistical significance is shown. *Comparisons no COVID vs severe; ^#comparisons mild vs severe; ^§comparisons moderate vs severe; ^$comparisons no COVID vs mild; ^£comparisons no COVID vs moderate