| Smallpox vaccine contains live vaccinia virus, a milder cousin of the variola virus. |
| Other viruses in this group that can cause infection in humans include variola, vaccinia, and cowpox viruses. |
| It suggested that immunizing humans against smallpox might protect them against genetically engineered variola as well. |
| Smallpox is an acute contagious disease caused by variola virus, a member of the orthopoxvirus family. |
| Dr Edmiston explained how anthrax, smallpox variola virus, botulism, and pneumonic plague fit the criteria. |
| The Smallpox virus, or variola, has been wreaking havoc across the globe for thousands of years. |
