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.
牛痘刚感染一个细胞后，就在细胞表面显示出两个病毒蛋白，这表明细胞已经感染。
Just after vaccinia infects a cell, it expresses two viral proteins on the cell surface, which marks the cell as infected.
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.
在正痘病毒属还有另外几种病毒对人具有一定的感染性，如痘苗病毒、牛痘病毒和猴痘病毒。
Variola virus belongs to the genus of orthopoxvirus, and there are some other infectious members, such as Vaccinia virus, cowpox virus, and monkeypox virus.
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.
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.
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