更重要的是，这种减毒活病毒结种于未孵化的鸟类后可提供有效的预防。
More importantly, this live attenuated virus provided effective protection when it was administered to birds before they had hatched.
目前使用的载体大多是减毒或修改过的病毒。
Many of the vectors currently in use are based on attenuated or modified versions of viruses.
在南非追踪研究最近被感染了因突变而减毒的艾滋病毒而且无上述优势人类白细胞抗原的21名妇女。
The South African study tracked 21 women without the beneficial form of HLA who were recently infected with the weakened strain of HIV.
在南非追踪研究最近被感染了因突变而减毒的艾滋病毒而且无上述优势人类白细胞抗原的21名妇女。
The South African study tracked 21 women without the beneficial form of HLA who were recently infected with the weakened strain of HIV.
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