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现代免疫的概念认为免疫是机体低抗外来侵袭和保持体内相对平衡的重要手段,这一反应是机体极为复杂的生理机制,是在亿万年进化过程中为适应复杂环境所建立的功能。简言之免疫就是机体识别、中和、排除和消灭异物的过程。所谓异物则包括病原微生物及其产物,也包括其他抗原性物质如动物血清,同种异体移植物(皮片、细胞),突变的细胞及改变了性质的自身物质等。当这些异物如微生物侵入机体或异体皮片移植
The concept of modern immunity that immunity is the body’s low resistance to foreign invasion and maintain the relative balance of the body an important means of this response is the body’s extremely complex physiological mechanism is hundreds of millions of years in the evolutionary process to adapt to the complex environment to establish the function. In short, immunity is the body’s process of identifying, neutralizing, eliminating and eliminating foreign bodies. The so-called foreign body includes pathogenic microorganisms and their products, but also include other antigenic substances such as animal serum, allografts (skin slices, cells), mutated cells and change the nature of their own substances. When these foreign bodies such as microorganisms invade the body or allograft