After every practice wrestling mats across the country get wiped down.
They get wiped down occasionally with mma and BJJ. Not enough.
The nature of grappling is that you get microabrasions at every exposed point, and the staph bacteria is literally everywhere. Ringworm is generally direct contact and is actually a fungus, similar to athletes foot.
Both of them are gross and good reasons to clean the fucking mats, wear rash guards grappling and hit the shower afterwards.