Usage History of 'aphthous'

The following chart shows how frequently 'aphthous' appeared in printed materials over time. For example, the word 'aphthous' occurred 6 times in books in 1715 and 4,084 times in 2008. From 1715 to 2008, the word 'aphthous' was used a total of 145,421 times in books scanned by Google. See Reference: Google Ngram project.

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