Potties, and Snoogies, and Drool, Oh My!

I was under the impression that I was going to be able to have a short work day today. I only had one scheduled appointment, then some more orientation and paperwork, but then I was going to call it a day. Well, the first house my partner and I went to was filled with dirty children and a very pukey mommy. Needless to say, we cancelled that one and went back to the office. For the last few days, both of us in the room have been fighting whatever bug is going around. The one with the sore throat, stuffy/runny nose, headache, and exhaustion? yeah, that's the one. So we're lysoling EVERYTHING and using hand sanitizer like it's water.
I thought I was in the clear and that I would be able to leave without encountering any more sickness for the day... that was before I was asked to provide "respite" aka babysitting for 4 children while their parents received couples counseling upstairs. So there I was with a 10 year old, 9 year old, 3 year old, and 2 year old playing with puppets (which the little ones were putting in their mouths), making meals in the fake kitchen (which the little ones were putting in their mouths), and building towers with blocks (which the little ones were putting in their mouths AND wiping their VERY green snot on). Then, the 2 year old (who is apparently being potty trained) had the "urge" every 10 minutes or so, causing him to whip his diaper off while in the middle of peeing, me trying to "aim" his little boyhood in the direction of the bathroom (not even the toilet, just trying to get it on linoleum instead of our work carpet). I am pretty sure that every single inch of me has been infected by little boy grossness. When I have my own kids, they will be better raised than this. Everybody with class knows that you put your boogers on your own toys, not someone else's.