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我们知道,人得了麻疹、流行性乙型脑炎、伤寒、流行性腮腺炎等传染病,一经康复后,一般不会再得同样的病。这是什么原因呢?原来人体感染了这些病的病原体以后,就会发生一系列特殊的反应——免疫反应,在体内产生免疫物质(抗体等),这些物质协同作战把体内的病原体消灭掉,病就痊愈了。人体内的这些抗体可以长时间甚至终身存在,使人体获得免疫力,一旦同样的病原体再次入侵,抗体就能及时把它消灭,人也就不会再得同样的病了。预防接种就是根据这个原理。使用科学的方法把病原体或其毒素杀灭
We know that people who have acquired infectious diseases such as measles, Japanese encephalitis, typhoid and mumps will not usually get the same disease after recovery. What is the reason? The original human infection of these pathogens after the disease, there will be a series of special reactions - the immune response, the body produces immune substances (antibodies, etc.), these substances work together to eliminate the body’s pathogens, The disease is healed. These antibodies in the human body can exist for a long time or even for a lifetime, so that the human body can acquire immunity. Once the same pathogen re-invades, the antibody can eliminate it in time and the human will no longer get the same disease again. Vaccination is based on this principle. Use scientific methods to kill pathogens or their toxins