| NOUN | animal | variola virus, smallpox virus | the virus that causes smallpox in humans |
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| Meaning | The virus that causes smallpox in humans; can be used as a bioweapon. | |
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| Synonym | smallpox virus | |
| Narrower | variola major, variola major virus | A type of smallpox virus that has a fatality rate of up to 25 percent |
| variola minor, variola minor virus | A type of smallpox virus that has a fatality rate of about 1 percent | |
| Broader | poxvirus | Any of a group of viruses that can cause pox diseases in vertebrates |
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