More importantly, this live attenuated virus provided effective protection when it was administered to birds before they had hatched.

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。

youdao

GACVS considered recent data on the safety profile of live attenuated sa 14-14-2 JE vaccine, provided in a number of expert presentations to the Committee.

GACVS审议了一系列新近由专家递交的关于乙脑病毒减毒活疫苗SA 14 - 14 - 2株安全特性的资料。

youdao

Most will be inactivated virus vaccines made in eggs, some will be killed virus vaccines made in cell cultures and a few will be live attenuated virus vaccines.

多数是在鸡胚中生产的灭活病毒疫苗，一些是在细胞培养基中生产的灭活疫苗，还有几个减活病毒疫苗。

youdao

We've talked about getting lucky, finding a naturally occurring attenuated live vaccine as in the case of smallpox.

我们谈到过,在天花病案中,我们发现自然弱化的活性疫苗,是多么的幸运

耶鲁公开课 - 生物医学工程探索课程节选

So, it's more effective because it's a live virus but it's a little bit more concerning because it's a live virus as well, in that you trust that it's attenuated but could it convert back to a virulent form or a form that caused a disease.

因此,口服疫苗更加有效,因为它是活性病毒,但又是因为这一点,人们也存有更多顾虑,当它处于减毒状态时你会信任它,但是它会不会转变回,强毒壮态或者致病状态呢

耶鲁公开课 - 生物医学工程探索课程节选

Fluenz is a live attenuated - weakened - intranasal vaccine, which has been used for several years in the United States under the brand name FluMist.

BBC: Flu vaccines for all children