I've been bit a lot by my guys. Always either defensively or when I smelled too much like a rat or an ASF. They never hurt much, but bites from larger ones definitely draw some blood.

But I honestly think that bites from ASFs are more annoying. They just keep trying to
bite you and sometimes don't let go. I've lifted an adult an entirely out of it's cage with it still grabbing on to my hand with it's nasty little teeth.

And a bit from a large normal rat? Forget about it, those hurt so much more than snake bites it's not even funny.