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２０００年版《中国生物制品规程》（以下简称《规程》）要求腮腺炎疫苗的半成品滴度不低于４．７５ＬｏｇＣＩＤ５０／１．０ｍｌ，成品３７℃放置７ｄ前后滴度均不低于４．０ＬｏｇＣＣＩＤ５０／１．０ｍｌ。我们通过克隆法筛选主代种子批疫苗毒种，选育出毒力强且稳定性好
The 2000 edition of the China Biological Products Regulations (hereinafter referred to as the “Regulations”) requires that the titers of the mumps vaccine should not be lower than 4.75LogCID50 / 1.0ml, the titers of the finished products should not be lower than 4.0 before and after 7 days of storage at 37 ℃. 1.0ml. We cloned by screening the main generation of seedlings vaccine strains, bred strong virulence and good stability