Smallpox doesn't exist anymore----How did this happen?

Answers (1)

Smallpox in one of the most freared disease in past times. This disease is caused by variola virus. This disease  was eradicated by a collaborative global vaccination programme led by the World Health Organization and last known case of small pox was observed in 1977.  However, smallpox was officially declared eradicated in 1979.

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