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天然免疫是机体防御反应中重要的环节。目前认为天然免疫系统在防御反应中位于首当其冲，可将进入机体的物质分为无害和有害物质，将有害物质提供给特异性免疫系统并指导其以适当方式将其清除。天然免疫的物质基础是胚系基因编码的各种蛋白质，其广泛存在于血浆和血细胞上。如
Natural immunity is an important part of the body’s defense response. At present, it is considered that the natural immune system bears the brunt of defense reactions. The substances that enter the body can be classified into harmless and harmful substances, and the harmful substances can be provided to the specific immune system and instructed to remove it in an appropriate manner. The material basis of innate immunity is a variety of proteins encoded by germline genes, which are widely present in plasma and blood cells. Such as