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由于大规模地采用麻疹活疫苗预防接种,明显地减少了麻疹的流行过程及发病率。对大部分未患过麻疹的儿童进行预防接种的地方发病率不超过0.1—0.5％,发病者亦多为轻型或中型,重型者仅占接种人数的1—2％。由于采取麻疹疫苗改变了流行的疫源性。给所有未患过麻疹的儿童进行接种的集体单位,带入麻疹患儿也未散播,所以这些单位也不再采取检疫措施。由于近年来麻疹活疫苗接种的结果,年龄大一
Vaccination on a large scale with live measles vaccine has significantly reduced the prevalence and incidence of measles. The incidence of most vaccinated children who do not have measles is no more than 0.1-0.5%. Most of those who are ill are light- or medium-sized, while those with heavy forms account for only 1-2% of those vaccinated. The prevalence of foci has changed as a result of measles vaccination. Collective vaccination of all those children who have not been infected with measles has also not been carried out with measles children, so quarantine measures are no longer taken by these units. As a result of measles vaccination in recent years, the age of freshman