The third phase, to test whether the vaccine prevents real infection, has not yet been carried out, as there has been no massive spread of H5N1 influenza in people.
第三阶段临床试验用于测试该疫苗是否能够预防真正的传染，由于现在人群中还没有出现大规模的H5N1禽流感传染，所以该阶段还没有实施。
The third phase, to test whether the vaccine prevents real infection, has not yet been carried out, as there has been no massive spread of H5N1 influenza in people.
第三阶段临床试验用于测试该疫苗是否能够预防真正的传染，由于现在人群中还没有出现大规模的H5N1禽流感传染，所以该阶段还没有实施。
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