They will bite, but they won't kill or make you sick. Depending on how the person reacts to bug bites, you can have a little red spot, or a huge bump.
Late last night, I went outside to talk to my neighbor and what could have been the same spider ran across the patio headed to my open door! I shooed it away and before i could say anything, the neighbor stomped on it! So much for saving the poor guy's life!