Other orthpoxviruses that cause infections in humans include variola ( smallpox ) , vaccinia ( used for smallpox vaccine ) , and cowpox viruses 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。
2.
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 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。
