IL2 and COVID-19: Additionally, the analysis of IL-2 (Supplementary Figure 9) showed a positive correlation with anti-NP IgG levels (r=0.3182, p=0.0014) (Supplementary Figure 9A) in all the COVID-19 patients, however, there was no correlation between IL-2 and anti-NP IgA, IgM, anti-Spike and anti-RBD IgG, IgA levels (Supplementary Figures 9A–C).