A similar result related to the expression of C5AR1 was revealed by the reanalyses of another public data set of the single-cell transcriptome of cells from BAL fluid of patients with COVID-19 (33), corroborating that C5AR1-expressing neutrophils are increased in the lungs of patients with COVID-19 (Supplemental Figure 2). This evidence concerns the gene C5AR1 and COVID-19.