The nine year old, predictably, got cowpox.

不出所料，这个九岁的孩子得了牛痘。

Jenner took material from a milkmaid 's cowpox sore and injected it into the child.

詹纳从一个挤奶女工的牛痘疮中提取出物质，并将其注射到孩子身上。

They were known to get a mild disease called cowpox.

人们发现，她们会得一种叫做牛痘的轻微疾病。

She told Jenner that one of her cows, named Blossom, had recently suffered from cowpox.

她告诉詹纳，一头名叫布洛瑟姆的奶牛最近患了牛痘。

Jenner suspected that her blister might give him the opportunity to test whether cowpox was humanity's long-awaited cure.

詹纳猜想她身上的水泡可能会给他一个测试牛痘是否是人类期待已久的治疗方法的机会。

It worked by infecting people with pus from pox lesions caused by similar but far less pernicious conditions, like cowpox.

其工作原理是让人们感染痘疹伤口流出的脓来产生免疫，这些痘疹由类似但危害性小得多的疾病（如牛痘）引起。

And the scientific term for cowpox is at the heart of our story about the English word, " vaccine" .

牛痘的科学术语是关于英语单词" vaccine（疫苗）" 的故事的核心。

Two had been deliberately infected with cowpox.

其中两人被故意感染了牛痘。

This virus is a much more hazardous cousin of chickenpox and cowpox.

这种病毒是水痘和牛痘的近亲，危险性更大。

And so he used that observation to in fact immunize an eight-year-old boy, James Phipps, using the cowpox virus.

因此，他利用这一观察结果，实际上使用牛痘病毒免疫了一名 8 岁男孩詹姆斯·菲普斯 (James Phipps)。