I was recently (yesterday) on the metro/train. An apparently drunk homeless women (with sadly poor personal hygiene) got on the train, and as the train left the station, she fell to the floor. I went to help her up, and offered my hand as support to lift her up, but as I did so, I noticed medical gauze with a bloodstain on her wrist area. I did my best to avoid the area as I pulled her up, and washed my hands and arms carefully within 20 minutes of the incident. There were no traces of (visible) blood on my hand or arm, and I have no open cuts, scrapes, sores or scabs on my arm. If she herself had HIV, is there a risk that I could have contracted it? My understanding is that blood to blood contact is the easiest way for HIV to spread, and this worries me, even though I don't think I touched any of her blood, and I had no cuts on my own arm...