Usage History of 'serums'

The following chart shows how frequently 'serums' appeared in printed materials over time. For example, the word 'serums' occurred 2 times in books in 1710 and 2,326 times in 2008. From 1710 to 2008, the word 'serums' was used a total of 188,565 times in books scanned by Google. See Reference: Google Ngram project.

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