毒力变异(virulence variation) ： 卡介苗BCG：Calmette和Guérin将牛分枝杆菌经13年230次传代而获得的减毒活疫苗株 耐药性变异(drug-resistance variation) ：...
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studies on virulence variation 毒性变异研究
virulence variation in pathogen 病原物毒性变异
the variation of virulence 致害性遗传变异
Aim To reval the virulence variation related to vacuolating cytotoxicity of coccoid Helicobacter pylori.
目的指示球形幽门螺杆菌致细胞空泡变性毒力的变异情况。
Then we can really start to look at the genetic variation within the species and gain insight into some of the genes involved in drug resistance or virulence.
然后我们才能真正地开始寻找该物种的种内遗传变异，并获得和耐药性或毒力有关的一些基因的信息。
The variation of virulence and RACES of Xoo population were compared systemically.
通过试验系统比较了不同时期病菌的毒性和小种组成变化。
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