Methods: In 40 cases with infantile pneumonia and 20 case controls,serum vitamin A levels were determined by fluorescene,and T-lympHocyte subsets(CD3+,CD4+,CD8+,CD4+/CD8+)of the pneumonia group were determined by FCM.

• 方法:采用微量荧光法测定血清VitA含量,对40例婴幼儿肺炎患儿进行检测并与同期20名体检健康婴幼儿对照; 流式细胞仪测肺炎患儿T细胞亚群(CD3+,CD4+,CD8+,CD4+/CD8+);