There seems to be an active effort to hide this history, but I think that "Spanish flu" was an epidemic caused by a run amok vaccine experiment conducted by Rockefeller physician Dr. Frederick Gates.

https://rupress.org/jem/article-pdf/28/4/449/1175015/449.pdf

On origins of "Spanish flu" in Kansas.

https://www.kansas.com/news/local/article200880539.html (You might want to know when this article was "updated")

This is an older article: https://www2.ljworld.com/news/2005/nov/25/flu_fears_bring_mind_deadly_horror_1918/

I think we should be looking at this in light of the material shared as a notable "Murder by Injection".