作者用双盲法将82名健康婴儿随机分成两组。一组接种标准剂量的DTP(0.5ml),另一组减量(0.25ml)接种,比较二组接种后的副作用和血清学应答。免疫程序为初次免疫3次,分别于2、4和6月龄进行;加强免疫1次,于18月龄进行。DTP为Connaught实验室制备。每ml百日咳抗原含8.8小鼠保 The authors used a double-blind method to divide 82 healthy infants into two groups at random. One group received a standard dose of DTP (0.5 ml) and the other group (0.25 ml) was inoculated to compare side effects and serological responses after vaccination. Immunization program for the first immunization 3 times, respectively, at 2, 4 and 6 months of age; enhanced immunization 1, at 18 months of age. DTP was prepared by Connaught Laboratories. Per ml pertussis antigen containing 8.8 mice