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.

• 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。