在世界上许多不发达的国家和地区,麻疹是5岁以内儿童发病和死亡的主要原因。各种研究结果表示,几乎所有未免疫的儿童都会患此病。许多国家麻疹免疫的覆盖面小,常见的原因是保健人员经常面临许多免疫禁忌症。如果小孩生病、营养不良或者住院,免疫接种就会推迟。然而,正是这些儿 Measles is the leading cause of morbidity and mortality among children under five years of age in many underdeveloped countries in the world. Various studies show that almost all un-immunized children develop the disease. In many countries, the coverage of measles immunization is small and often due to the fact that many health-care providers often face many contraindications to immunization. Immunization will be delayed if the child is sick, undernourished or hospitalized. However, it is these children