It may be worth noting that while this piece presents it as settled that the Spanish flu originated in Kansas, that's not really the case. The author of this piece, John Barry, has long been an advocate for that position, but there are other theories of origination as well supported by at least as much evidence as the Kansas theory.

Wikipedia has a write-up on the various theories of origination here: https://en.wikipedia.org/wiki/Spanish_flu#Hypotheses_about_t...