Usage History of 'flu'

The following chart shows how frequently 'flu' appeared in printed materials over time. For example, the word 'flu' occurred 2 times in books in 1507 and 92,351 times in 2008. From 1507 to 2008, the word 'flu' was used a total of 1,485,985 times in books scanned by Google. See Reference: Google Ngram project.

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