Usage History of 'diphtherial'

The following chart shows how frequently 'diphtherial' appeared in printed materials over time. For example, the word 'diphtherial' occurred 2 times in books in 1858 and 322 times in 2008. From 1858 to 2008, the word 'diphtherial' was used a total of 12,423 times in books scanned by Google. See Reference: Google Ngram project.

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