IL6 and COVID-19: In WAVE III, the serum levels of IL-6 and sIL-6R continued to be significantly increased in COVID-19 patients compared to healthy controls (63.15 ± 18.5 pg/mL vs. 1.91 ± 0.89 pg/mL, p < 0.01 and 75.21 ± 14.29 ng/mL vs. 26.51 ± 8.16 ng/mL, p < 0.05, respectively).