对 42名婴儿的脐血于免疫前及免疫后跟踪测定了脊髓灰质炎 (脊灰 )抗体。结果显示 :大多数婴儿血清中携带有母体 3个型的脊灰抗体 ,阳性率达 88 10 %～ 90 48% ,几何平均滴度 (GMT)为 1∶8 67～ 1∶2 1 5 3。母亲脊灰抗体水平的高低直接影响婴儿胎传抗体水平 ,母亲抗体滴度越高 ,婴儿滴度亦越高 ,两者呈正相关。 5 0 %左右婴儿胎传抗体在 2月龄时已降至阳性值以下 ,其余的也降至较低水平 ,选择此时进行口服脊灰疫苗全程免疫成功率可达 10 0 % Polio (polio) antibodies were measured on the cord blood of 42 infants before and after immunization. The results showed that most of the maternal serum polioviruses carried 3 types of poliovirus, the positive rate was 88 10% to 90 48%, and the geometric mean titer (GMT) was 1:8 67 to 1: 2 1 5 3. The level of maternal polio antibody directly affects the level of infant’s fetal antibody, the higher the maternal antibody titer, the higher the infant’s titers, the two are positively correlated. About 50% of the babies with antibodies to the baby at 2 months old have dropped below the positive value, the rest also dropped to a lower level, choose this time for oral polio vaccine full success rate of up to 100%