Here's the stuff we found when you searched for "The "In Flew Enza" rhyme clearly refers to the flu. It may have predated the 1918 Pandemic, though the assertion online that it first appeared in "Our Paper" Vol. 10 (1894) is belied by the fact of that periodical and issue having no trace of it. Yes, I actually found and read it. Certainly, the jump-rhyme first became popular in '18, when its darker meaning was immediately recognized and documented"

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