Usage History of 'serotypes'

The following chart shows how frequently 'serotypes' appeared in printed materials over time. For example, the word 'serotypes' occurred 2 times in books in 1893 and 9,442 times in 2008. From 1893 to 2008, the word 'serotypes' was used a total of 265,459 times in books scanned by Google. See Reference: Google Ngram project.

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