通过种牛痘天花已得到控制。
一位英国医生爱德华•琴纳(Edward Jenner)，发现通过接种感染牛痘脓疱可以预防天花。
An English physician, Edward Jenner, discovered that by inoculating a person with pustules from the pox infection of a cow, smallpox could be prevented.
所有儿童都种了牛痘以预防天花。
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.
这个致命的传染病，曾夺走了数百万人的生命，并带来许多苦难。但是WHO展开根除天花的计划，服务范围无远弗届；只要有人居住的地方，都有专人将牛痘疫苗送达该处。
Smallpox had caused millions of deaths and much suffering for centuries, but once the agency set out to eradicate it, WHO personnel traveled the world to conduct a massive vaccination program.
接种人痘，是直接使用小量的天花，和金纳后来用牛痘接种不同。
Unlike Jenner's later vaccination, which used cowpox, variolation used a small measure of smallpox itself.
接种牛痘能使人免患天花。
我种过了牛痘，所以对天花有免疫力。
我种过牛痘了，所以对天花有免疫力。
我的小孩种了牛痘以防天花。
在西方世界里，从发现种致使的牛痘能抵抗天花的那一刻起，天花就不再是一种灾难性的疾病。
From the discovery that harmless cowpox gave protection against deadly smallpox came vaccination and the end of smallpox as a scourge in the western world.
他们做的事情就像是爱德华·詹纳通过狂热的追寻治疗天花的方法而发现了牛痘。
They were doing what Edward Jenner did when he discovered a vaccination for smallpox by abandoning his quest for a cure.
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。
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.
吉米感染了牛痘并且很快就痊愈了。后来，他接触天花患者却不被感染，即使有的人都因患天花而死去。
Jimmy caught cowpox and soon got better, but later when he came near people who had smallpox he did not catch it, though other people die.
他发现他们都得过一种相似的但是温和的小病，牛痘，正是由于牛痘使得他们逃过了致死的天花。
He found that they'd all contracted a similar but milder disease, cow pox, which vaccinated them against the deadly smallpox.
我的小孩种了牛痘以防天花。
我的小孩种了牛痘以防天花。
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