text: 不同程度血清IgG2、IgG4、IgA和IgE下降甚或缺如抗体反应下降T细胞数量和功能多有减弱逐渐出现反复呼吸道感染淋巴细胞对放射线非常敏感，其DNA损伤不易修复。
entities.entity: 血清IgG2
entities.label: bod
entities.entity: IgG4
entities.label: bod
entities.entity: IgA
entities.label: bod
entities.entity: IgE
entities.label: bod
entities.entity: 血清IgG2、IgG4、IgA和IgE下降甚或缺如
entities.label: sym
entities.entity: 抗体
entities.label: bod
entities.entity: 抗体反应下降
entities.label: sym
entities.entity: T细胞
entities.label: bod
entities.entity: T细胞数量和功能多有减弱
entities.label: sym
entities.entity: 呼吸道感染
entities.label: dis
entities.entity: 逐渐出现反复呼吸道感染
entities.label: sym
entities.entity: 淋巴细胞
entities.label: bod