after watching the 4 seasons of tuf, i have an idea of why they might have problems with bacteria on teh mats.
they fucking wear their shoes all over it.
when they line up for the fighter matchups, they are wearing shoes. and they step forward onto the mats with shoes on????
i dunno about u, but at our gym, the guys go ballistic whenever people wear shoes on teh mats, also when guys go to the toilets without shoes on, fucking disgusting.
u cant go trouncing all over training mats with shoes on, and then start training on them, its common sense