C5 and COVID-19: Both, median C5a and sC5b-9 concentrations were higher in COVID-19 males vs. females (C5a, 4.62 vs. 3.46 ng/ml, p=0.019; sCb5-9, 1476 ng/ml vs 859 ng/mL, p=0.008) which was not observed in the control group.