[Getready]

I have spoke to lifeguards about some of this kinda stuff.
At one outdoor pool i have been to, some baby pooped in the
pool. They closed and drained the pool..OK fair enough...
But when I asked them about it , they said that there always
is a bit of fecal matter in the pool, cause everyone loses
a bit here and there...not to mention saliva/sweat/skin cells/
urine....so imagine a reservoir with birds,fish,worms, insects
pooping, peeing, oh my goodness, copulating nearby...
I just think the guy had to do it, cause otherwise he would
have to admit to all of the other stuff they let get into
it and don’t worry about....

[Paridel]

Polio is mostly contracted through fecal-oral transmission. When it was a major problem in the US many mothers wouldn't let their children swim in public pools. It turns out they were right to do so - small children fouling public pool water was a major decease vector.

-paridel