Usage History of 'immunizing'

The following chart shows how frequently 'immunizing' appeared in printed materials over time. For example, the word 'immunizing' occurred 2 times in books in 1812 and 3,488 times in 2008. From 1812 to 2008, the word 'immunizing' was used a total of 241,560 times in books scanned by Google. See Reference: Google Ngram project.

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