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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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。

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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。

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