[Question #13975] Prolonged skin contact with debris on public surface (automated massage chair)

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1 months ago
Hi Dr, thank you again for your previous guidance. It was very reassuring and helpful.

I apologize for another question, but I would like to ask about a slightly different real-life situation to make sure I am correctly applying your advice. 

2 days ago, I used a public automated massage chair in a shopping mall. During the session (~30 minutes), my lower leg was in continuous and firm contact with the chair surface.

After the session, I noticed a small brownish, soft/sticky/slightly shining debris on my lower leg, approx- 0.5 cm (5 mm) in size. It looked like possible dried(or partially dried) biological material (e.g. skin debris or a small scab, wound from a previous user).

At the time of contact, my skin was intact with no visible cuts or bleeding (only normal hair follicles or very minor skin irritation).

I understand from your previous replies that environmental and indirect contact is considered zero risk. However, I would like to confirm whether this specific situation still falls under the same category?

My questions are:
1. Would contact like this pose any risk for HIV, syphilis, or hepatitis C? Do I need any tests? 
2. Does prolonged contact (~30 minutes) or massage pressure with this debris change the risk in this type of indirect exposure?
3. Would material like scabs or skin/wound debris remain infectious in a real-world environment?
4. Are there any known cases of transmission from similar environmental contact?

Thank you very much for your time and guidance.
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1 months ago

Just to clarify, my lower leg was under continuous mechanical massage pressure during contact with debris on the automated massage chair that could have been from a previous user, even if that person had an infection.

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1 months ago
One last clarification : The debris was present during the massage, so contact occurred throughout the entire ~30-minute session under mechanical massage pressure.
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H. Hunter Handsfield, MD
1 months ago
*Sigh*

Your previous question ended with this:

Please note the forum policy against repeated questions on the same topic. This is your third about your nonsexual or other zero risk exposures to HIV or other STIs and be your last along these lines. Repetitive questions may be deleted without reply and without refund of the posting fee. The forum sponsor doesn't want repeated payment for questions already answered (or whose answers are obvious from previous discussions) and repeated answers tend to prolong rather than relieve anxiety. In addition, such questions have reduced educational value for other users, one of the forum's goals. Thank you for your understanding.

This is not a significantly "different real life situation."

1. "Would contact like this pose any risk...?" No it would not.
2. "Does prolonged contact...?" No.
3. "Would material like scabs...?" I don't understand this question, but as best I do the answer is no.
4. "Are there any known cases of transmission from similar environmental contact?" No. There are no know cases from environmental contact of any kind.

Forget it. Move on without worry.

HHH, MD
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1 months ago
Dr Handsfield, thank you again for your clear and reassuring reply! Really appreciate!
I would just like to clarify one point in case my wording was unclear earlier. (English is not my primary language)
What I meant to describe is that I am certain the wound debris/scab was from a previous user, not my own.

Q1: With this clarification, may I ask whether your previous answers (all 4 of "No") were already given with this understanding, and therefore still apply? 
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If your previous answers still apply, I understand the conclusion as follows:
C1: biological debris from a previous user (if infected)  environmental surface  prolonged contact (~30 minutes) with my skin under mechanical massage pressure 
This type of indirect environmental contact is no risk at all for HIV, syphilis, or other STIs, regardless of duration or pressure. 

C2: In this specific situation, even if hypothetical my skin had small cut /wound/pimples, this would still be considered a zero risk exposure. (understanding from [#13950] which I've asked and answered)
C3: There are no know cases from environmental contact of any kind, including HIV, syphilis, or other STIs. 
C4: so, it's the same advice for myself. Forget it. Move on without worry. 
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H. Hunter Handsfield, MD
1 months ago
I assumed the wound debris was from someone other than yourself. No chance in my judgment or advice.

All three of your statements C2-4 are correct.
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1 months ago

Hi Dr Handsfield, thank you very much for your clarification and patience. I really appreciate it.

As English is not my first language, I just wanted to confirm that I understood your wording correctly.

When you said “no chance in my judgment or advice,” I initially wondered if “chance” might have been a typo for “change,” so I wanted to confirm your intended meaning.


You meant that there is absolutely no possibility that this situation would change your judgment or advice, and that the risk remains zero, correct?


I now understand that environmental or everyday contact — even involving possible contact with another person’s wound debris — does not pose a risk for HIV, Syphilis or other STIs, and I do not need to worry about such situations in the future. I will not raise further questions about similar situations.


Thank you again.

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H. Hunter Handsfield, MD
1 months ago
Change/chance:  Yes that was a typing error. Sorry.

That completes the two follow-up comments and replies included with each question and so ends this thread. Thanks for the thanks. I'm glad to have helped. 
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