h5n1 avian influenza virus

基本解释

Not only are seasonal flu strains circulating but also the H5N1 avian influenza virus, which has killed 258 out of 423 people infected since 2003.
除了季节性流感，H5N1禽流感也是会流通的，自从2003年开始，禽流感已经感染了423人，其中造成258人死亡。
Research on influenza pandemics and pandemic viruses increased considerably following the first human cases of infection with the H5N1 avian influenza virus in 1997.
在1997年发现首批人患H5N1禽流感病毒感染病例之后，大大加强了对流感大流行和大流行性病毒的研究力度。
At the time, this was considered a likely scenario should the highly lethal H5N1 avian influenza virus develop an ability to spread readily among humans, but it was never a formal definition.
当时的看法是，如果高致命性H5N1禽流感病毒发展出人际轻易传播的能力，就可能会出现这一情景，但这从来不是一项正式定义。

Two tests on the woman were positive for H5N1 avian influenza, but the government did not say how she might have contracted the virus.
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