The immune response of attenuated JE vaccine virus strain was reported.

乙脑病毒减毒株注入脑内后，病毒繁殖受抑并被清除；

youdao

Evans thinks Virxsys has made this less likely by limiting the vaccine virus to a single cycle of infection.

Evans认为VIRxSYS通过限制病毒单次感染而将这种可能减小。

youdao

The problem was to discover how to provide large amounts of vaccine. This was eventually solved by growing the vaccine virus on the flank of cows.

将近一个世纪，疫苗病毒(称牛痘)从手臂到手臂、从一个人身上转移到另一个人身上，问题是如何找到提供大量疫苗的方法，这个问题最终通过在牛胁腹部种植疫苗病毒的办法解决了。

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One was the ability of the vaccine to prevent infections from the human immunodeficiency virus, better known as H.I.V.

VOA: special.2009.10.13

So, that was a naturally occurring attenuated virus that could be produced into a vaccine that didn't cause the disease.

因为天花病毒存在天然的衰减病毒,这种衰减病毒可以用来,直接生产不致病的疫苗

耶鲁公开课 - 生物医学工程探索课程节选

So, some of these cases were probably due to polio that was transmitted by incompletely killed virus that was present in the vaccine.

因此,那些病例的发病的原因,是被那些疫苗中携带的,没有被完全杀死的病毒感染

耶鲁公开课 - 生物医学工程探索课程节选

Basil O'Connor, president of the National Foundation, to develop a dead-virus vaccine, an approach that left just enough of the virus to generate the antibodies needed to fight the disease.

FORBES: 85 Innovations 1939-1955

Gardasil, a vaccine for the virus that causes cervical cancer, experienced a slow in growth.

FORBES: Big Pharma

The first vaccine against the virus that causes cervical cancer has been cleared by the U.S. Food and Drug Administration.

FORBES: Merck Cervical Cancer Vaccine Approved