Usage History of 'immunizers'

The following chart shows how frequently 'immunizers' appeared in printed materials over time. For example, the word 'immunizers' occurred 2 times in books in 1908 and 8 times in 2008. From 1908 to 2008, the word 'immunizers' was used a total of 741 times in books scanned by Google. See Reference: Google Ngram project.

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