Usage History of 'spirochetes'

The following chart shows how frequently 'spirochetes' appeared in printed materials over time. For example, the word 'spirochetes' occurred 2 times in books in 1719 and 3,910 times in 2008. From 1719 to 2008, the word 'spirochetes' was used a total of 240,118 times in books scanned by Google. See Reference: Google Ngram project.

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