It has also been pointed out that flushing toilets with the lid up aerosolizes fecal matter in the bowl and sends it up in a misty little plume. And public restrooms never have lids. So unless it just been cleaned thoroughly in the last few minutes it’s poop on every surface.
So basically public restrooms are a perfectly fecal environment from the ground up.
[ETA: ack. @anon94804983 beat me to it.]
