Such as complement activation; COVID-19, thrombosis and anticoagulation; FOXP3 in COVID-19 was found in the COVID-19 cohort; meanwhile, COVID-19, thrombosis and anticoagulation; complement activation and Cells and molecules involved in local acute inflammatory response were found in the QIV cohort(Figures 1G, H). Here, FOXP3 is linked to COVID-19.