Hand washing is a biggie
I love dancing...but not the germs. Without being too crude, germs thrive in heat and humidity and all of the touching and lack of handwashing after the bathroom are a recipie for getting sick! You don't necessarily need any antibacterial soap, soap and water are fine. The main thing is to not touch the faucet or the bathroom door after washing your hands. As I said before, a lot of people don't wash their hands (or they just rinse) after using the restroom. I always turn off the faucet with an elbow or a paper towel and open the door with it as well. I know it sounds paranoid, but I don't get sick too often. Also, I try not to touch my face while I'm dancing or when I'm sweaty (but don't always succeed!). Again, that's how a lot of germs get transferred, I think.
As always, drinking water and getting plenty of rest is always a plus. HTH!