Usage History of 'variolate'

The following chart shows how frequently 'variolate' appeared in printed materials over time. For example, the word 'variolate' occurred 2 times in books in 1811 and 32 times in 2008. From 1811 to 2008, the word 'variolate' was used a total of 610 times in books scanned by Google. See Reference: Google Ngram project.

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