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为切实评价我市消灭脊髓灰质炎（简称脊灰）的进程，于1993年11月，选择一农村地区，采用二阶段分层随机抽样方法，进行了健康儿童脊灰血清流行病学的现状监测。1．中和抗体阳性率：99名健康儿童，Ⅰ、Ⅱ、Ⅲ型中和抗体阳性率均为97．98％（9／99）；三型抗体均阳性者为95．96
In order to effectively evaluate the polio eradication process in our city, in November 1993, we selected a rural area and adopted the two-stage stratified random sampling method to monitor the status of polio epidemiology in healthy children . 1. The positive rate of neutralizing antibody: 99 healthy children, the positive rates of neutralizing antibodies of type Ⅰ, Ⅱ and Ⅲ were 97.98% (9/99), those of the three types of antibodies were 95.96