What can you contract through grappling and MMA training?
Between the sweat and skin to skin contact it seems that if someone has herpes or other problems than you can contract it during long training sessions.
Staph? Worm? all this seems common, what about STD?
Also, amateur MMA does not look for blood test so you could be fighting an HIV positive or Hep carrier. If the other guy gets cut bad, your corner should throw in the towel. My 2 cents on that.