Usage History of 'treponeme'

The following chart shows how frequently 'treponeme' appeared in printed materials over time. For example, the word 'treponeme' occurred 2 times in books in 1903 and 73 times in 2008. From 1903 to 2008, the word 'treponeme' was used a total of 9,649 times in books scanned by Google. See Reference: Google Ngram project.

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