Blood lymphocyte count was significantly lower, and blood IL-10 levels significantly higher in COVID-19 patients who died during the study period, compared to control patients [0.67 (0.47, 0.78) vs. 1.12 (0.52, 1.73) cells x103/μl, p < 0.05; 33 (18, 53) vs. 7 (2, 9) pg/ml, p < 0.001, respectively]. Here, IL10 is linked to COVID-19.