WHO扩大免疫规划在发展中国家中做了大量预防疾病和挽救生命的工作。然而,每年仍有超过350万的儿童因患能用免疫接种预防的疾病而死亡或残废。无数人患病是因未能接种有效的疫苗。在美国国立变态度应和传染病研究所的报告中提出用于发展中国家预防19种疾病的29种候选疫苗。这些疫苗的排列是根据其潜在的 WHO expanded immunization programs have done a great deal of disease prevention and life-saving work in developing countries. However, more than 3.5 million children die or are crippled every year as a result of diseases that can be prevented by vaccination. Numerous people suffer from the failure to vaccinate effective vaccines. In the report of the National Institute of Health and Communicable Diseases, the United States proposed 29 vaccine candidates for prevention of 19 diseases in developing countries. The arrangement of these vaccines is based on their potential