尽管儿童在接种麻疹疫苗后患病率一般在1～3％的低水平范围,但是有的疫区接种某种批号麻苗制剂后,其患病率相当高,尤其最近几年此问题更加突出,这就迫切需要研号与复种有关的问题。本文就疫区与一般居民区麻疹患病率以及复种麻苗对象的选择方法进行了研究。材料和方法无论是城镇一般居民区患病还是疫区学龄前及学校儿童出现暴发或散在流行,均统计麻苗接种后的患者,同时核对所用麻苗批号。将1967～1975年间用L-16和EST麻苗 Although the prevalence of measles vaccination in children is generally in the low range of 1-3%, the prevalence of some batches of vaccines in some endemic areas is quite high, especially in recent years This urgently needs the study of issues related to multiple cropping. In this paper, the prevalence of measles and the general residential area prevalence and the method of selection of multiple anesthesia seedlings were studied. MATERIALS AND METHODS Patients in both general residential areas in urban areas and in pre-school and school-based areas outbreaks or casualties were surveyed. 1967 ~ 1975 with L-16 and EST Ma Miao