| Other viruses in this group that can cause infection in humans include variola, vaccinia, and cowpox viruses. |
| He showed that cowpox vaccination prevented smallpox in a child deliberately exposed to the disease. |
| Unlike vaccination, which utilised the cowpox virus, inoculation involved the deliberate infection of a susceptible individual. |
| Vaccination of smallpox started in the late 18th century with Jenner's cowpox vaccine. |
| He used the mild disease cowpox to confer immunity for the potentially fatal but biochemically similar smallpox. |
| The cowpox virus, which infects a range of animals including humans, has been genetically altered in a similar way. |
