[rabboRubble]

regrettably the toilet infection vector is a known thing in epidemiology. it's called a "fecal plume" or "toilet plume".

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4692156/

https://www.cdc.gov/niosh/nioshtic-2/20043244.html

[londons_explore]

Toilets vary more than you would expect around the world. Some countries have mostly high pressure, fast moving water designs, which I presume leave a lot of droplets in the air, while others have far slower more "swirly" designs that I suspect transfer less into the air.

It would be good to see research on this...