CD163 and COVID-19: Concerning the other main biomarkers analysed in this study, the median plasma concentration of NE and sCD163 observed in our cohort of COVID-19 patients was respectively at least five times higher, and one-point-six times higher, than the values (16-21 ng/ml and 400 ng/ml for NE and sCD163, respectively) reported in recent publications for control groups of 60-70 years old subjects [34, 40, 41].