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。
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