星期六中国卫生部网站宣布，新确诊一人患禽流感。
China's ministry of Health has confirmed a new human case of bird flu, the ministry announced on its website Saturday.
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。
Research on influenza pandemics and pandemic viruses increased considerably following the first human cases of infection with the H5N1 avian influenza virus in 1997.
科学家们对H5N1型（属于1型分支）和H7N9型（2型）禽流感病毒进行了研究，目前已有数百人因此患重病或死亡。
The scientists also studied two bird flu viruses, H5N1 (belonging to the type 1 branch) and H7N9 (type 2), each of which already has caused hundreds of cases of severe illness or death in humans.
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