I had an encounter with a gentleman with whom we discussed his status and mine (both negative) and I pick at my thumbs, but had a band aid over it. During lunch, the band aid came off, and after, we made out in the car and I touched his penis and may have gotten precum on my thumb, then he did do filatio to me, but did not for long. I got test tested with the 4th generation test 8 weeks and 1 day after to which it came back negative. What is the likelihood of HIV transmitting, and should I get tested again?
Hello and thanks for reaching out to the AIDS Vancouver Helpline.

It sounds like you have some concerns about the likelihood of acquiring HIV.

First off, it is great that you talked about both your partner's status and yours during the encounter, it's always good to discuss with your partner before engaging in any sexual activity. From what you have told me, you had a small cut on your finger, which was originally covered by a band-aid but came off and may have gotten in contact with pre-cum. When it comes to HIV transmission, there needs to be a body fluid, an activity and a direct access for the virus to enter the bloodstream. While there is a risk for one to acquire HIV from an open cut, this particular cut needs to be deep enough that one would need to seek medical attention immediately. Furthermore, the body fluid would have to essentially have no air time as once exposed to air, the virus becomes damaged to the point where it is no longer transmissible. Thus, since your cut is small you would be at a
Negligible Risk for acquiring HIV. Furthermore, the act of receiving oral sex from your partner is considered Negligible Risk as well as there is an exchange of bodily fluids, but no one has ever acquired HIV in this manner before.

It is great that you pursued HIV testing! Here at AIDS Vancouver we recommend routine testing as it is a great way to stay up to date on your current HIV status. The 4th generation test is one of the best tests that you can take at the moment.

4th Generation EIA

As you can see above it is conclusive at 3 months post exposure. While you have not engaged in any high risk activities, you can always pursue a rapid test at the 3 month mark to get that conclusive result letting you know what your current HIV status is.

Below I have attached an HIV Transmission Equation Chart, which goes into further detail on the necessary factors that are required for one to be at risk of HIV transmission.


Test Name Method Window Period Conditions
4th Generation EIA Blood test that looks for antibodies AND p24 protein antigens. Commonly referred to as the "combination," "combo" or "DUO" test. P24 protein is detectable immediately after infection but only for the first few weeks. The antibody (ab) test has a window period of 4-12 weeks post exposure. This test is widely available in North America. Most HIV specialists consider this test to be conclusive at 6 weeks but official HIV testing guidelines still recommend re-testing at 12 weeks for conclusive results. Conclusive at 3 months post exposure.
---------- -------- ----------------------------
• blood (including menstrual) • unprotected anal or vaginal intercourse • vagina
• semen • sharing needles • anus
• pre-cum • mother to child (in specific cases) • urethra in the penis
• rectal secretions • open cuts and sores (in theory)
• vaginal fluids • other mucosal membranes
• breast milk | • points of needle injection
For more information on HIV you can visit [HIV Basics](


Chris, Volunteer

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