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Smallpox was caused by two viral strains; Variola major and Variola minor. The mortality rate for V. major, overall, was about 30%. With V. minor, the mortality rate was about 1%. After a massive and continuing vaccination campaign begun in the mid-20th century, the World Health Organization claimed the complete eradication of smallpox in 1979.

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Q: What is the mortality rate of smallpox?
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