Usage History of 'viruses'

The following chart shows how frequently 'viruses' appeared in printed materials over time. For example, the word 'viruses' occurred 2 times in books in 1703 and 220,664 times in 2008. From 1703 to 2008, the word 'viruses' was used a total of 6,184,115 times in books scanned by Google. See Reference: Google Ngram project.

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