Well, I hate to said this but the bog’s at work are cleaner than most home ones. Its all down to who cleans and when. If you have some person who on min wage doing the work, then you know there going to do a bad job.
If your working for a company that employ’s a lot of temp overseas worker or people who sleep around, then you may pick something up from the seat. (Crabs)
The comomist way of picking something up like”worms” is when you don’t wash your hands afterward or someone esle who has not wash there hands.
But I think there was less than 400 case of worms in the UK last year
http://www.worldtoilet.org/doyou/doyou.htm
The worst toilet I ever saw was in a house in London with students living in it, it was white when they move in, now it brown/red with lumps.