I wasn't sure what you meant, so I looked it up: "poor bathroom hygiene" is not like toilet seat wiping or other in-bathroom stuff, but rather about pathways th

I wasn't sure what you meant, so I looked it up: "poor bathroom hygiene" is not like toilet seat wiping or other in-bathroom stuff, but rather about pathways that make trace amounts of someone else's feces end up in your mouth. > [Polio] is transmitted primarily via the fecal–oral route, by ingesting contaminated food or water. (--en.wikipedia.org/wiki/polio) This can take many forms, some obvious such as if someone doesn't wash their hands after using the toilet, shakes your hand, and you later eat something; others less obvious such as if someone poops into la Meuse in France and someone gets some water in their mouth in what is known as de Maas in the Netherlands. (Not sure how many pathogens survive French wastewater treatment or how many people swim in Maas-connected water bodies during hot weather, but you get the idea.) More info on this route at https://en.wikipedia.org/wiki/Fecal%E2%80%93oral_route https://en.wikipedia.org/wiki/Fecal%E2%80%93oral_route