Usage History of 'viral'

The following chart shows how frequently 'viral' appeared in printed materials over time. For example, the word 'viral' occurred 2 times in books in 1657 and 248,398 times in 2008. From 1657 to 2008, the word 'viral' was used a total of 5,967,642 times in books scanned by Google. See Reference: Google Ngram project.

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