The virus that causes smallpox is known as variola.

Monkeypox is a cousin of the virus that causes smallpox.

They took a harmless version of the vaccinia virus, which causes smallpox, and infected melanoma cells with it in the laboratory.

The rose is imbued with a spell to cause smallpox.

In 1700, Nicolas Andry thought that some of these microscopic organisms caused smallpox and other diseases.

Alastrim, also known as variola minor, is the milder strain of the variola virus that causes smallpox.

Smallpox vaccine, which is made from a live virus related to the one that causes smallpox, is considered the most dangerous immunization.

The most famous member of the genus is Variola virus, which causes smallpox.

The viruses that cause smallpox, monkeypox and cowpox, because they infect people, are among the best-known members of the pox virus family.

The vaccine is made from a virus different from the one that causes smallpox.