Usage History of 'biohazard'

The following chart shows how frequently 'biohazard' appeared in printed materials over time. For example, the word 'biohazard' occurred 2 times in books in 1955 and 3,068 times in 2008. From 1955 to 2008, the word 'biohazard' was used a total of 62,997 times in books scanned by Google. See Reference: Google Ngram project.

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