I had a party 2 weeks before, and I were sharing a beer on same bottle with one person in the party. We were drinking like, he will take a sip of beer from the bottle, and give to me, then I will take a sip and then he will take another, then me, like it went till the bottle is empty.
I noticed later, the person had a wound in his lips, so my worry now is if any fresh blood from his wound is in the top of the bottle(where I Sipped) or blood in the beer, is there any risk of transmitting HIV to me if that person is HIV Positive ?