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
It's reproduction of the virus and passage of that virus onto new cells which causes the problems with disease that we associate.
病毒一旦繁殖并进入新细胞,就会带来相关病症的危害
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