接种疫苗是预防保健的一大胜利。但是这项构建免疫学护盾来防范致命病原体的工程还有很长的路要走——一些致命性最强的疾病还没有用于防治的有效疫苗。不仅如此,世界范围内的疫苗分配还存在许多不公平现象。虽然疫苗的开发和生产过程都有了很大进步,但全人类为通过疫苗来根治疾病所做出的努力仍然面临着来自科学、技术和经济方面的障碍。疫苗接种是医学的一大里程碑。但是未来之路依然漫长,这是显而易见的。虽然我们对世界上最致命的三种疾病——结核、疟疾和艾滋病——做了大量研究,我们仍然没有找出针对其中任意一种的有效疫苗。另一种几乎已经被西方世界遗忘的疾病——小儿麻痹症——仍然泛滥在一些贫穷的国家。但我们离终点 Vaccination is a big triumph in preventive care. But there is still a long way to go to build an immunological shield to protect against deadly pathogens - some of the most deadly diseases do not yet have an effective vaccine for control. Not only that, there are still many inequalities in the distribution of vaccines worldwide. Although there has been considerable progress in the development and manufacture of vaccines, all humankind’s efforts to cure diseases through vaccines still face scientific, technical and economic barriers. Vaccination is a major milestone in medicine. But the future is still long, which is obvious. Although we have done a great deal of research on the three most deadly diseases in the world, tuberculosis, malaria and AIDS, we still have not found an effective vaccine against any of them. Another disease, almost forgotten by the Western world, poliomyelitis, continues to proliferate in some poor countries. But we are far from the end