The other mutation with a significant effect on virulence has been seen in the NA gene of two influenza virus strains that infect mice.
另一种对病毒毒性具有重要影响的突变，存在两种感染小鼠的流感病毒株的NA基因上。
ObjectiveTo study the effect of gene polymorphism of a (H1N1) influenza virus on viral replication and virulence.
目的研究a (H1N1)甲型流感病毒基因多态性对病毒复制及毒力的影响。
Conclusion The rate of carrying virulence gene in Vibrio parahaemolyticus from seafood isolates was very low in China.
结论 中国副溶血性弧菌水产品分离株毒力基因携带率非常低。
For example, transfer of virulence gene and transmission of drug-resistant gene mediated by a phage results in gene polymorphism of bacteria, which is an important problem in medicine and genetics.
如由噬菌体介导的细菌毒力基因的转移、细菌耐药基因的传递等导致了病原菌基因表型的多态性，这在医学与遗传学中是一个日益严峻的重要问题。
Using this inducible system can be used for quantitative regulation of gene expression regulation and virulence gene function analysis and so on.
利用这种可诱导的调控系统可以用于定量调控基因表达以及进行毒性基因功能分析等方面的研究。
The results of virulence gene survey showed that the frequencies of V2, V2+ 6 and V8changed widely.
毒性基因结构分析表明，V2、V2+6和V8等毒性基因的频率有较大变化。
Dynamic gene mutation and the reassortment of genes have been considered as the key factors responsible for influenza a virus virulence and host tropism change.
动态的基因突变和基因重组被认为是流感病毒A的致病性和宿主趋向性改变的关键因子。
Dynamic gene mutation and the reassortment of genes have been considered as the key factors responsible for influenza a virus virulence and host tropism change.
动态的基因突变和基因重组被认为是流感病毒A的致病性和宿主趋向性改变的关键因子。
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