What is smallpox? How is it caused?
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An acute contagious viral disease, with fever and pustules that usually leave permanent scars. It was effectively eradicated through vaccination by 1979. 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
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