As shown in Figure 1, CD3+ T lymphocytes (p < .05), CD4+ T lymphocytes (p < .01), CD8+ T lymphocytes (p < .05), and CD4+/CD8+ T lymphocyte ratio (p < .05) were all decreased in the SCAP group, compared with the nonsevere CAP group. This evidence concerns the gene CD4 and syringocystadenoma papilliferum.