In 1996, the World Health Assembly recommended that all remaining stocks of smallpox (variola) virus be destroyed.

1996年，世界卫生大会建议销毁所有剩余的天花病毒储存。

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This research was recommended by the WHO Advisory Committee on Variola Virus research in November 2004, and is intended to develop better medicines, vaccines and diagnostics for smallpox.

这项研究是由世卫组织天花病毒研究咨询委员会2004年11月建议的，旨在针对天花开发更好的药物、疫苗和诊断办法。

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The vaccinia virus is a non-dangerous virus used in the smallpox vaccine because it is related to the variola virus, which is the agent of smallpox.

痘苗病毒使用在牛痘苗时是无害的，因为它与作为传播天花媒介物的天花病毒相关。

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We know now that it's caused by a related virus, called vaccinia, remember the virus that causes smallpox is called variola.

我们现在知道这病由一种相关的病毒引起,这种病毒叫牛痘病毒,想想天花病毒也被叫做牛痘病毒

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Remember that the lucky thing about the smallpox vaccine was that a naturally occurring attenuated form of the smallpox virus variola called vaccinea was found.

对于天花病毒来说,幸运的是,存在一种自然发生的,被称作痘苗病毒的,天花病毒的衰减疫苗

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But variola, which causes smallpox in humans, and vaccinia, which causes a disease called cowpox in cattle, turned out to be, we now know, viruses that are molecularly very similar.

但是导致天花的人痘病毒,和导致牛痘,的牛痘病毒,后来发现其实是,我们现在知道,这两种病毒在分子水平上十分相似

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