作者测定了256份产妇脐血中抗百日咳和副百日咳杆菌的特异性抗体,认为产妇脐血中存在的不同水平的抗体可以反映长期、系统地大规模接种百日咳菌苗的状况。作者将256名产妇分为4个年龄组,即15～19岁、20～24岁、25～29岁和30～34岁,每组再分为初产妇和经产妇两个亚组。测定结果表明,具有抗百日咳杆菌特异性抗体的产妇数随年龄的增长而减少,其中15～19岁 The authors measured specific antibodies against pertussis and pertussis among 256 maternal umbilical cord blood samples. It is thought that different levels of antibodies present in umbilical cord blood of pregnant women may reflect the status of large-scale, systemic and large-scale vaccination of pertussis. The authors divided 256 mothers into 4 age groups, 15 to 19 years old, 20 to 24 years old, 25 to 29 years old and 30 to 34 years old. Each group was divided into two subgroups, primipara and maternal. The results showed that the number of mothers with anti-pertussis specific antibodies decreased with age, of which 15 to 19 years old