Fusion protein is the main protective antigen of NDV and the primary structure of fusion protein determines the virulence of the virus.
蛋白不仅是NDV主要保护性抗原，而且F蛋白一级结构(氨基酸顺序)决定病毒毒力。
In addition, the inherent virulence of the virus can change over time as the pandemic goes through subsequent waves of national and international spread.
而且，随着大流行病在国内和国际上波浪式相继传播，病毒的内在毒力可能会逐渐发生变化。
There are two crucial factors: the transmissibility of the virus, and its virulence.
有两个关键因素：病毒的传播性和其毒性。
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。
For all its virulence, the latter spreads most easily when animals are in close contact with each other, so restricting the movement of animals isolates the virus and stops it from spreading.
因为对于口蹄疫及它所有的毒性而言，病毒最容易的传播途径是通过动物之间的紧密接触；所以限制动物的自由移动就可能隔离病毒、断绝传播源。
Infection of host cells by virus is the key for the virulence, virus particles infect the host cells by binding to cellular receptor and by the receptor-mediated membrane fusion reaction.
病毒感染宿主细胞是病毒致病的关键所在，病毒感染细胞需要与其受体相结合，介导其与细胞的膜融合反应。
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。
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。
Aims: in order to clarify the clinical epidemic of hepatitis G virus (HGV) and evaluate the virulence of HGV.
目的：为了弄清肝病患者中庚型肝炎病毒(HGV)的临床感染情况和评估庚型肝炎病毒的致病力。
The virus was analyzed by the animal pathogenicity test, virus attenuation, protection of the attenuated virus and virulence return experiment.
对分离的痘病毒进行动物致病性试验、病毒分离传代和致弱试验、致弱毒保护力试验和返强试验。
The virus was analyzed by the animal pathogenicity test, virus attenuation, protection of the attenuated virus and virulence return experiment.
对分离的痘病毒进行动物致病性试验、病毒分离传代和致弱试验、致弱毒保护力试验和返强试验。
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