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人类发展的历史在某种意义上讲可以说是与疾病抗争的历史。在生活实践中经过长期的经验积累,人类逐渐认识到凡患过某种传染病的人恢复健康后一般就不会再患同样的疾病了,也就是说他们获得了对该病的抵抗力。其实这种所谓的抵抗力就是由于人们接触了病原微生物而产生了免疫力。我国古代给人体接种人痘预防天花,这种人痘可以称为国际上最早的疫苗。
In a certain sense, the history of human development can be described as a history of fighting the disease. After long-term experience in life practice, human beings have come to realize that those who suffer from a certain infectious disease generally will not suffer from the same disease after they are recovered, that is, they have acquired resistance to the disease. In fact, this so-called resistance is due to people’s exposure to pathogenic microorganisms and the resulting immunity. In ancient China, people vaccinated human smallpox vaccination against smallpox, this kind of human pox can be called the earliest international vaccine.