text: 可伴发自身免疫性疾病、哮喘和肠吸收不良血清IgA低于0.05IgM及IgG正常或升高，分泌型IgA也明显减少丙种球蛋白，因其含有微量IgA，可诱导患儿产生抗IgA抗体（属IgG2类），但所幸的是相当一部分IgA缺陷病患儿同时伴发IgG2亚类缺陷，这些人一般不会发生过敏反应。
entities.entity: 自身免疫性疾病
entities.label: sym
entities.entity: 哮喘
entities.label: sym
entities.entity: 肠
entities.label: bod
entities.entity: 肠吸收不良
entities.label: sym
entities.entity: 血清IgA
entities.label: bod
entities.entity: 血清IgA低于0.05
entities.label: sym
entities.entity: IgM
entities.label: bod
entities.entity: IgG
entities.label: bod
entities.entity: IgA
entities.label: bod
entities.entity: 分泌型IgA也明显减少
entities.label: sym
entities.entity: 丙种球蛋白
entities.label: bod
entities.entity: 微量IgA
entities.label: bod
entities.entity: 抗IgA抗体
entities.label: bod
entities.entity: IgG2
entities.label: bod
entities.entity: IgA缺陷病
entities.label: dis
entities.entity: IgG2亚类缺陷
entities.label: dis