scRNA-seq analysis of PBMCs from two control and two COVID-19 patients (WHO-graded cohort) (SI Appendix, Table S2) charted all expected myeloid and lymphoid populations and discriminated four monocyte populations along the CD14-, CD16-, and HLA-expression scheme (Fig. 2 C and D and SI Appendix, Fig. S3). The gene discussed is CD14; the disease is COVID-19.