Usage History of 'immunogen'

The following chart shows how frequently 'immunogen' appeared in printed materials over time. For example, the word 'immunogen' occurred 12 times in books in 1917 and 1,457 times in 2008. From 1917 to 2008, the word 'immunogen' was used a total of 90,017 times in books scanned by Google. See Reference: Google Ngram project.

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