re: Spanish Flu, >>8718907 (lb)
In 1948 Heinrich Mueller, the former head of the Gestapo, told his CIA interrogator that the most devastating plague in human history was man-made.
He was referring to the influenza pandemic of 1918-1919 that infected 20% of the world's population and killed between 60 and 100 million people. This is roughly 3 times as many as were killed and wounded in World War One, and is comparable to WWII losses, yet this modern plague has disappeared down the memory hole.
Mueller said the flu started as a US army bacteriological warfare weapon that somehow infected US army ranks at Camp Riley KS in March 1918, and spread around the world.
http://www.pbs.org/wgbh/amex/influenza/peopleevents/pandeAMEX86.html
"Was The 'Spanish Flu' Epidemic Man-Made?"
https://rense.com/general74/amak.htm