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疫苗使用后相应疾病明显缺如是评价疫苗效果的最好指标,但许多疾病周期性的特点使得短期内难以判断。对一个区域或机构的免疫保护程度的较好指标,是大多数已接种者持续存在满意的抗体水平。为进一步研究幼儿群体免疫状况,1986年4月在全省抽取10,831名幼儿进行了麻疹白喉破伤风的血清流行病学监测。材料和方法一、抽样方法:依照按容量比例的概率抽样方法(2),对108～120个县市区进行监测,占全省
The apparent absence of a vaccine after its use is the best indicator of vaccine efficacy, but the cyclical nature of many diseases makes it difficult to judge in the short term. A good indicator of the degree of immune protection in a region or agency is the persistence of satisfactory antibody levels in most vaccinated individuals. To further study the immunization status of young children, 10,831 young children were sampled from the province in April 1986 for serological surveillance of measles-diphtheria tetanus. Materials and Methods 1. Sampling Method: According to the probability sampling method (2) according to the proportion of capacity, 108-120 counties and cities are monitored, accounting for the entire province