本文调查了１９９２～１９９３年广西８４个暴发点中人群的麻疹年龄发病专率及暴发后麻疹ＨＩ阴性率，用以推算人群在暴发前后的麻疹易感率。发现暴发前２０岁以内的人易感率已高达２０％以上，暴发后人群残余易感率仍有１６％。作者认为在广西亚热带，少数民族山区，可将２０岁以内２０％的人群易感率作为开始暴发的临界点，１６％作为暴发流行的终止点。用此作为监测麻疹是否流行的指标 This paper investigated the incidence of measles age and the measles negative HI rate among 84 outbreaks in Guangxi from 1992 to 1993 to estimate the population susceptibility to measles before and after the outbreak. Found that predisposing people within 20 years of age before the outbreak of susceptibility has been as high as 20% or more, the residual susceptibility after the outbreak of the crowd is still 16%. The author believes that in the subtropical Guangxi, mountainous areas of ethnic minorities, 20% of the population within 20 years of susceptibility can be used as the starting point for the outbreak of the critical point, 16% as the outbreak of the outbreak. Use this as an indicator of the prevalence of measles