Immunohistochemical staining of tissues from deceased pediatric patients with KD revealed infiltration of coronary artery aneurysms by CD4+ T cells, CD8+ T cells, and CD68+ macrophages in patients with acute KD, It was also found that CD8+T lymphocytes were 4-5 times more than CD4+T lymphocytes in KD vascular lesions. The gene discussed is CD4; the disease is coronary aneurysm.