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Thank you for requesting me.
I apologize for the slight delay in my response as I was away.
I understand your concerns about HIV but with this route the transmission rate is VERY LOW indeed. It is less than 0.1%.
Practically speaking the risk is even lower and in your case since you do not have any sore in your mouth and also considering that your friend was most likely HIV negative your risk is negligible to say the least.
So I would not worry whatsoever.
Let me know if you have more questions.
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