Anonymous
I had accidental (condom came off) unprotected sex in Nov. I went on PEP 56 hours post exposure and took PEP for 28 days. 25 days after the exposure I took an HIV test and it was negative. I was taking the PEP still when I got the test done AND it had only been 3.5 weeks since the exposure. I went to the dr. today to get a repeat HIV test and asked her what kind of tests they use in hopes she would say they use the most up to date tests that detect early infections, but she said they use the older version of HIV tests that doesn't normally pick up early infections. SO, my question is, what are my chances that I will still be negative this time around? Could the PEP have given me a false negative? What about testing 3.5 weeks after an exposure, would I have enough antibodies by then to test positive? Also, could receiving oral sex transmit HIV? Like lets say a guy performed oral sex on another female a couple hours prior to performing it on another girl, could it be transmitted that way? I'm a female by the way. Thanks for reading and please I could use as many answers as possible!!!
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Anonymous
Hello and thank you for contacting the AIDS Vancouver Helpline. I understand you are worried about your recent test results, and I will be more than glad to address your concerns.

An HIV test taken at 3.5 weeks would not be very accurate to being with, since for a test to be conclusive it must be taken at least 3 months after exposure. The fact that you are on PEP also further reduces the accuracy of the test. Once you complete your 28 days of PEP treatment, you have to wait 3 months and then be tested, for it to be considered conclusive. (so basically 4 months after exposure, considering the 1 month of PEP adding to the 3 month window period). The good news is that PEP is over 90% effective to prevent acquisition of HIV.

To answer your other questions, receiving oral sex is a negligible risk activity, meaning that there has never been a documented case of HIV transmission by this activity.

Sincerely,

Ali

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