For IL-10, we found that serum IL-10 levels were increased in nonsevere and severe cases with COVID-19 compared to healthy subjects (WMD = 1.08, 95% CI: 0.60-1.56, and P < 0.01; WMD = 2.27, 95% CI: 1.26-3.29, and P < 0.01) (Figures 8(a) and 8(b)). This evidence concerns the gene IL10 and COVID-19.