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作者通过流行病学实验,研究推广使用列宁格勒3号腮腺炎活疫苗的可能性。实验时使用3种编码制剂,一次接种量分别含病毒微粒40,000、20,000和5,000,简称1号、2号和3号疫苗。接受观察的对象为3,247名3～7岁的儿童,随机分作4组。实验组儿童(2,536名)各接种上述一种腮腺炎活疫苗,对照组儿童(711名)不接种。
Through epidemiological experiments, the authors investigated the possibility of promoting the use of Leningrad 3 parotid live vaccine. Three kinds of encoding preparations were used in the experiment. The primary inoculum contained 40,000, 20,000 and 5,000 virus particles, respectively, and the vaccines Nos. 1, 2 and 3 were referred to as vaccines. Subjects under observation were 3,247 children aged 3 to 7 years and were randomly assigned to 4 groups. The experimental group of children (2,536) were vaccinated with one of the above mumps live vaccines, while the control group of children (711) were not vaccinated.