It’s called toilet plume.

A toilet plume is the invisible to the naked eye, cloud-like dispersal of raw, infectious sewage particles as a result of flushing a toilet. Flush particles rapidly rise out of the bowl and several feet into the air after flushing. Aerosolized droplets can remain suspended in the air for tens of minutes between users, posing an inhalation risk. These invisible particles go on to coat and spread onto surfaces like floors and counters or objects like hand towels, bathmats, or even toothbrushes.

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    12 hours ago

    The invisible particles that spread by air are not generally able to transmit disease because of their size, low concentration, and the short lifespan of pathogens surviving the airborne journey.

    However, when you flush under a closed lid a MUCH higher concentration and long-lived pathogenic layer is deposited on the underside of the lid.

    When you then sit down to shit, your shirt brushes against that moist underside of the lid behind you and THAT is much more dangerous as it moistens your garments and follows you back to your couch or bed.