Wanna dig into a spinoff of MK Ultra?
Back in the 50s the CIA sprayed the fog in SF Bay area to spread a virus, 11 people became ill with a "never seen before" urinary tract infection, they considered the experiment a success.
Germ warfare.
You can dig deeper if you like.
https://www.cia.gov/readingroom/docs/Final%20Letter[15992821].pdf