I would like to say that you should probably wear shoes inside the shower...I am 1000% certain that I contracted a foot fungus after using the shower at T2 (station 3) ....
Having never in my entire life having contracted a foot fungus (despite travels in the swamps of Florida & Georgia, Cambodia, Misery (the State) ) I got one there...I even remembered thinking.."hmmm...this shower looks pretty sketchy...."
My gunny sergeant from a long time ago taught me to always pee on my feet in the showers to sanitize my feet if the shower was gross but it didn't work in this case..YMMV!!
I didn't report it but I suppose I could have gotten 5k miles if I did!