Hmm...with me when they hit me the floating dmg number is zero but I do take health dmg and will die in about 30 seconds if standing still. Water keeps them at bay as long as its ankle deep or more, torch doesn't do anything. I cant do dmg to them with any weapon so far and as I always start a new character on maps I don't yet have any tames. They glitch right through my base walls and hit me so at best I get a minute or two to try to do chores/craft before I get chased back to water, makes creating weapons, narcs and tranqs tough. I will test bug repellent if I ever get farming up but I don't