Usage History of 'tuberculins'

The following chart shows how frequently 'tuberculins' appeared in printed materials over time. For example, the word 'tuberculins' occurred 2 times in books in 1845 and 54 times in 2008. From 1845 to 2008, the word 'tuberculins' was used a total of 14,702 times in books scanned by Google. See Reference: Google Ngram project.

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