第二章原发性免疫缺陷病免疫缺陷病（immunodeficiencydiseases，ID）是指免疫系统的器官（如胸腺），免疫活性细胞（如淋巴细胞和吞噬细胞）及免疫活性分子（免疫球蛋白、淋巴因子、补体分子和细胞膜表面分子）发生缺陷引起某种免疫反应能力缺失或降低，导致机体防御能力普遍或部分下降的一组临床综合征。
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