Usage History of 'spirochaetes'

The following chart shows how frequently 'spirochaetes' appeared in printed materials over time. For example, the word 'spirochaetes' occurred 2 times in books in 1881 and 709 times in 2008. From 1881 to 2008, the word 'spirochaetes' was used a total of 68,718 times in books scanned by Google. See Reference: Google Ngram project.

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