Usage History of 'variola'

The following chart shows how frequently 'variola' appeared in printed materials over time. For example, the word 'variola' occurred 6 times in books in 1727 and 5,440 times in 2008. From 1727 to 2008, the word 'variola' was used a total of 244,765 times in books scanned by Google. See Reference: Google Ngram project.

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