Welcome to the Forum. Thanks for your questions.  As you might imagine, there are no scientific studies to provide an answer to your question.   However, there have been theoretical concerns about sharing straws or rolled bills  contaminated with blood to snort cocaine and, through this mechanism, transmission of HIV.  If this occurs at all (I have never seen or heard of a case), it is very, very rare.  Further, the risk of getting inoculated from a credit card is much, much less likely than the risk from a straw.   When you combine these facts with the fact that most people do not have untreated HIV, the risk of HIV from an exposure of this sort is close to zero and not something I would worry about.  EWH---

Thank you for your answer sir. I have been reading other questions about the same topic, also in this forum, and as you say, I understand that is hard to find studies that give information about it. My fear is based on the fact that blood can transmit it, and thinking about the chance that there could be blood on the card makes me feel worried (close to panic). I've done a lot of research about it on the resources from the CDC and other sources, finding nothing. But as you probably know, other sources affirm that it is a way of adquiring HIV. And that is why it's hard for me to assume there ir almost zero risk (It is a personal matter, I am not meaning I dont trust you, nothing like that). I dont know if you could share with me any study, finding or evidence about this kind of cases, if they exist. I would be so thankfull. I understand you would no worry about it, but trying to be sure and resolve my anxiety, could you tell when should I take a 4th generation laboratory test or an RNA PCR (Viral load) for HIV to be conclusive? So much thanks again.

By looking for information through other sources, I suspect you mean the Internet. If so, I think you will find that much of what his present is misleading, and it is difficult to tell fact from fiction. As I mentioned above, I have never heard or seen a case of HIV acquired in the way you suggest. This mechanism of HIV transmission, to my knowledge, is purely Theoretical, and if it occurs at all occurs very very rarely. So rarely that testing is a little benefit.---
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Thank you so much Mr. Hook. I will follow your advice and just to be safe, I'll take a PCR after the time you suggested. I would like to share the results with you if you agree. Thank you again.

Thanks.  I’ll leave the thread open so that you can share your results.  I anticipate they will be negative, showing that you were not infected. EWH---

Hello Mr. Hook. Today I took a quantitative HIV-1 PCR test with a cuttoff of 20 copies/ml, 12 days after the situation, giving a negative or undetactable result. The doubt that I have right now is if it is enough time for it to be conclusive. I saw that the CDC says the window period for that test is from 10 to 33 days, the clinic where I took it says 7 days to be conclusive. I'm so thankfull that it came back negative. Thanks again. 

Thank you for the update. Please remember what a low risk exposure. This was. I would consider these results conclusive.---