Usage History of 'tuberculin'

The following chart shows how frequently 'tuberculin' appeared in printed materials over time. For example, the word 'tuberculin' occurred 1 time in books in 1822 and 8,721 times in 2008. From 1822 to 2008, the word 'tuberculin' was used a total of 846,640 times in books scanned by Google. See Reference: Google Ngram project.

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