CD19 and COVID-19: UMAP and FlowSOM clustering analysis of live, CD3-/CD14-/CD19-/CD56- cells (cleaned from lymphocyte and monocyte lineages) revealed mild and severe COVID-19 patients to harbor clearly distinct population distribution than HC (Fig 1A, UMAP of live PBMCs without lymphocyte and monocyte lineage removal depicted in S1 Fig).