Assertion: smallpox's virus | /r/Synonym | variola major
Facets:
Source sentences:
text: Caused by a moderately contagious virus known as Variola major , the initial signs of smallpox came twelve days after exposure, usually by infection of the respiratory tract.
text: Although researchers say more than 95% of the smallpox cases reported in the 20th century were caused by a mild form of the variola virus (smallpox) called variola minor, the Boston epidemic was caused by a more dangerous form of the virus known as variola major.