论文部分内容阅读
接种疫苗提高人群的免疫水平，是预防传染病的重要措施之一。因此，世界卫生组织（WHO）和联合国儿童基金会（UNICEF）在发展中国家大力推行扩大免疫规划（EPI），作为保护儿童健康的重大项目。免疫制品的一个特点是具有生物学活性，绝大多数需要注射。注射是医疗预防上广泛应
Vaccination to improve the population’s immune level is one of the important measures to prevent infectious diseases. Therefore, the World Health Organization (WHO) and the United Nations Children’s Fund (UNICEF) vigorously promote the expansion of immunization programs (EPI) in developing countries as a major project for the protection of children’s health. One of the hallmarks of an immune product is its biological activity, with the vast majority requiring injection. Injection is widely used on medical prevention