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流感大流行指的是全球范围的流感暴发。引发大流行的流感病毒可以是全新的,也可以是旧的流感病毒重现。人体内几乎没有对抗这种病毒的免疫力,又尚无有效的疫苗。流感病毒能够在人群中快速传播,感染者可发生严重的疾病,甚至死亡。疾病可以在短时间内波及整个国家以及全球。很难
The flu pandemic refers to a worldwide flu outbreak. The flu pandemic flu virus can be brand new, it can be the old flu virus reproduce. Almost no human body against the virus’s immunity, there is no effective vaccine. Influenza virus can spread rapidly in the population, the infected person may have serious diseases, and even death. Illness can reach the entire country as well as the world in a short period of time. Difficult