HLA-DRA and COVID-19: To further investigate the phenotypic alterations of monocytes in response to SARS-CoV-2 virus infection, we divided them into HLA-DRhigh or HLA-DRlow cell types, based on the transcriptional level of the HLA-DRA gene in the studied dataset, and determined the most differentially expressed genes, encoding cell surface proteins, between COVID-19 and control samples (Figure 5A and Figure S10).