IL6 and COVID-19: Different biomarkers have been investigated in COVID-19, including C-reactive protein (CRP), procalcitonin (PCT), interleukin-6 (IL-6), and soluble urokinase-type plasminogen activator receptor (suPAR).6, , -9 These biomarkers are involved in different inflammatory pathways and are elevated in different kind of infections and have also been incorporated in different prediction models of disease severity or mortality.10,11