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blood on the subway train

Question: 

Hi, I was on an escalator in the metro when i noticed blood on the bottom of the ramp. I'm not sure if it was dry or not. If it was hiv+ and wet, and if my clothing touched it, and if i touched that part of my clothing (i did not see any blood on my hands) and then went to the bathroom, could i get anything?

Answer: 

Hello,

Thank you for your inquiry. From what we gather from the question, you were asking about whether or not you can acquire HIV by blood coming in contact with your clothing. From the information given, this scenario is determined to be No Risk. Transmission of HIV is not possible with the given scenario. (No exchange of bodily fluids)

For a risk to exist, specific HIV+ fluids must come into direct contact with the blood stream of an HIV- person. Most of the body's surfaces are dry skin (e.g. legs, arms) and they don't allow HIV to enter the body. Wet skin (or mucous membranes) is more vulnerable to HIV. These include: Foreskin and urethra in penis, cervix & vagina, anus & rectum, mouth and throat, open cuts/sores.

HIV outside of the body or drying HIV causes a rapid (within several hours) 1-2 log (90%-99%) reduction in HIV concentration. Also Quote from CDC states: "HIV does not survive long outside the human body (such as on surfaces), and it cannot reproduce outside a human host.

Recommendation: No need for HIV test with the scenario provided, refer to a physician for other health related questions. Regards, AIDS Vancouver Helpline/Online, (Vardah)