FCGR1A and COVID-19: We observed that both PBMCs and monocytes had upregulated expression of mRNAs of myeloid markers, including CD14, α-integrins (CD11b and CD11c), FCγ receptors (CD64A), and macrophage scavenger receptors (CD163), as a function of the severity of COVID-19 (Fig. 1A and C).