这就是发现接种牛痘的情况。

That was how vaccination was discovered.

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牛痘的故事告诉我们，战胜传染病需要世界各国的共同努力。

Vaccinia story tells us that the fight against infectious disease needs the concerted efforts of all countries in the world.

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人在接过种后产生的抗体可以同时对牛痘病毒感染及其密切相关的天花病毒感染起到保护作用。

The vaccinated person developed antibodies which protected both against the cowpox infection and against the closely related virus that caused smallpox.

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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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But unlike the Cowpox virus, vaccinea, that we talked about before, this is the real disease causing agent.

但是同我们之前曾讨论过的,牛痘病毒疫苗的不同之处在于,这是可以直接致病的病毒

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And he produced a fluid from cowpox lesions, so these were these lesions, these skin lesions on cows.

他生产出一种取自牛痘,即牛皮肤上的瘢痕的液体

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