FCGR1A and COVID-19: Finally, expression of the low-affinity Fcγ receptor III (CD16) was significantly decreased whereas expression levels of Fcγ receptor II (CD32) and Fcγ receptor I (CD64) were significantly increased on neutrophils in BAL fluid compared with blood neutrophils of patients with COVID-19 (Figure 3, J–L; and Supplemental Figure 1, H and I).