First, we analyzed the numbers of circulating DNT cell subsets by gating for CD45+CD3+CD4−CD8− cells (Fig. 1A) in pneumonia patients and healthy controls; we found that the numbers of DNT cells in healthy controls were not significantly different from those in patients in the pneumonia (p > 0.05) and severe pneumonia (p > 0.05) groups (Fig. 1B). This evidence concerns the gene PTPRC and susceptibility to pneumonia measurement.