以下为句子列表：
英文: It belongs to a group of viruses that includes the smallpox virus (variola), the virus used in the smallpox vaccine (vaccinia), and the cowpox virus.
中文: 它属于一个包括天花病毒、在天花疫苗中采用的病毒和牛痘病毒的病毒组。
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英文: Other orthpoxviruses that cause infections in humans include variola (smallpox), vaccinia (used for smallpox vaccine), and cowpox viruses.
中文: 其他导致人类感染的正痘病毒包括天花、牛痘（用于天花疫苗）和牛痘病毒。
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英文: Some compounds made from separate virus strains have been successfully used in vaccines against viruses from the same subfamily, such as smallpox in humans, which is made from cowpox virus, and human measles vaccines for canine distemper in puppies.
中文: 一些单独的病毒的混合,已经成功做成对抗病毒的疫苗,譬如像人类的天花,是相同的亚科病毒，是利用牛痘病毒做成的，而且人类的麻疹为小狗的大瘟热疫苗。
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英文: Variola virus belongs to the genus of orthopoxvirus, and there are some other infectious members, such as Vaccinia virus, cowpox virus, and monkeypox virus.
中文: 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。
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