Usage History of 'allergens'

The following chart shows how frequently 'allergens' appeared in printed materials over time. For example, the word 'allergens' occurred 2 times in books in 1893 and 25,381 times in 2008. From 1893 to 2008, the word 'allergens' was used a total of 602,718 times in books scanned by Google. See Reference: Google Ngram project.

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