So it's has great significance to construct the mutant storehouse and slecte the toxicity weak Hps mutant strain for developing the genetic engineering attenuated vaccine.
如构建出突变体库，从中筛选出毒力减弱的副猪嗜血杆菌突变菌株，对研制出基因工程弱毒活疫苗具有重要意义。
Objective To observe the adverse reaction and immunogenicity induced by live attenuated measles vaccine prepared with purified virus seeds of Chang-47 strain in infants aged 8 ~ 10 months.
目的观察麻疹长- 47株纯化毒种制备的麻疹减毒活疫苗在8 ~ 10月龄人群中的接种反应及免疫原性。
In order to study the attenuation of neurovirulence of SA14 14 2 attenuated vaccine virus, monkeys and mice were tested with the strain and its parent SA14 virulent strain.
为了解乙型脑炎（乙脑）减毒活疫苗弱毒株SA14 14 2神经毒力的减弱程度，本文对弱毒株及其原株SA14强毒株进行了猴体和小白鼠的致病性和病理学变化的比较试验。
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