A6, A9, CD74, COVID-, COVID-19, HLA genes, HLA-DRA, HLA-I, HLA-II genes, IFITM family genes, IFN, IFN-responsive genes, M0, S100 family genes, S100A4, S100A6, S100A8, S100A8 & A9, SARS-, SARS-CoV, SARS-CoV-2, T0, T9, TGF-, Treg, Treg clusters, circulating immune cells, circulating monocytes, high Treg, high Treg Cluster, human, inflammatory monocyte clusters, long, long-lived Tregs, monocyte, monocytes, non-classical monocyte cluster, patients, regulatory T, regulatory T (Treg) cells, regulatory T cells, sc, short, short-ived monocytes