Dear docs, yesterday in italy I’ve tested negative using the Biosure test(rapid finger-prick test, IgG only 2nd generation) at 92 days since the potential hiv exposure. In the meantime, since last week I’m at home and still positive to coronavirus, I had 3 doses of vaccine. Could the covid infection interfere with the rapid finger prick  test result and cause a false negative to my  test? Thanks 

Welcome back. Sorry to hear of your COVID infection despite being vaccinated.---

Thanks, this is reassuring, my exposure was vaginal sex, I’ve tested 3 times using the same rapid 2nd generation test at 56, 70 and 92 days after the exposure, negative all the 3 times, I assume I can rule out infection at this time. Regards 

You still say nothing about your partner and the likelihood she might have been infected. But if a woman has untreated HIV, the risk to her male partners is 1 in 2,500 for each episode of unprotected vaginal sex -- so your risk probably was low. If we assume a 1% chance she had HIV, your risk was 1 in 250,000. If we further assume you test results would detect "only" 99% of HIV infections by 3 months, then the possibility you have HIV becomes 1 chance in 25 million, which is zero for all practical purposes. In other words, in a low risk situation, even an imperfect HIV blood test is extremely reassuring. You can be very sure you don't have HIV!---

Thanks, just to complete the thread as you asked, the partner was a woman I met for one night stand and of unknown hiv status. I’d add also that the Biosure test I took, is the “European version”of the clearview complete marketed by Chembio.

I agree it is a very reliable test. Not knowing where you are, I cannot comment further on how risky this exposure was, i.e. the chance such a woman is likely to have HIV. But as discussed, even if you knew for sure she has HIV, you could still rely on your negative test result.

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