There were incidents at a local park growing up too that only had one of those little kiddy pools that were maybe 18" deep in the middle...between little kids having "accidents" and bigger kids screwing off (riding mud-caked bike through it...hey it was a bike wash! or older kids drinking and ahh...you know...) it got shut down a lot... People did not freak out about bugs then...colds, flu...all ran through the school...you either got it or not...mostly I believe I got it from a family member, where they got it from who knows... We touched everything, didn't swim in hand cleaner, coughed and sneezed in our hands... Most guys did the Iowa-hanky outside...
Morons today would die from panic attacks by the score!