Dunno, I surely would like to know this, too! The same goes with diseases. Does the game actually tell you if you contact a disease? I sometimes drink a Cure Disease Potion just in case...
You have to go into the magic screen and scroll down to active effects, then scroll through the active effects and poisons/diseases are in red. Completely illogical and a hassle, but nevertheless...
Edit: Bounties I have no idea.