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What virus causes smallpox?

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The variola virus causes it. There are two forms of the virus. The more dangerous form, variola major, led to smallpox disease that killed about 30% of people who were infected. Variola minor caused a less deadly type that killed about 1% of those who got it. How Smallpox Is Spread. The disease is highly contagious. read more

Causes. Smallpox is caused by infection with the variola virus. The virus can be transmitted: Directly from person to person. Direct transmission of the virus requires fairly prolonged face-to-face contact. The virus can be transmitted through the air by droplets that escape when an infected person coughs, sneezes or talks. read more

The cause of smallpox is an infection with the variola virus. This is a double-stranded DNA virus in the family Poxviridae and the genus Orthopoxvirus. Variola virus only infects humans. read more

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