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Likelihood of HIV with 27-day negative duo test?

I am a white American heterosexual male in my mid 40s and recently had an unprotected vaginal exposure with a white American heterosexual female former co-worker in her late 40s.  I tested negative for chlamydia, gonorrhea, syphilis, hepatitis B, and HIV at 27 days post-exposure.  Based on what I have googled, I have had none of the “typical” symptoms of any STD or HIV (fever, sore throat, flu-like other).  I also had a candid talk with the female post-event, and she noted that she isn’t promiscuous, although I don’t think that she has had a recent HIV test.

I was non-reactive on the combo (antigen/antibody) test at 27 days.  I realize that is one day short of the 28-day guideline, but for all intensive purposes, should I feel assured that I am HIV negative?
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20620809 tn?1504362969
Most likely the negative you got will remain negative.  That's a day earlier than when it's supposed to be considered confirmatory of status.  But, none the less, close.  Your chose if you want to retest but waiting until 28 days or more is advised for HIV testing.  I personally wouldn't retest.  Your risk wasn't that risky.  This is a known person to you and she isn't high risk.  A one time unprotected exposure is actually very low risk with transmission of less than 2 percent.  So, I personally would not be worried.  
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Avatar universal
Thanks for the thoughtful response, GuitarRox.  I was hoping that my odds were far less than 2% per exposure - 1 in 50 is hardly comforting.  Based on what I’ve read, it seems like risk from single exposure like mine is more likely something like 1 in 2,500, and that assumes an HIV positive partner.  If we’re talking random sampling here (unknown partner risk), my sense is that the single exposure number winds up being something like 1 in 2.5 million (that assumes 1:2,500 per episode and 1:1,000 white women have HIV).  Not intending to be rude, as I appreciate your thoughts.  Just much harder to sleep well with 1 in 50 versus 1 in 2.5 million.
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If it is bothering you then take another test. Statistics apply to large samples but you are one person, so whether your odds are high or low the risk exists. hiv docs can't diagnose from symptoms so no one here pays attention to them because it i a waste of time and neither should you. Only a test can prove.
Well said - thank you.
That risk is for unprotected sex, you didn't have unprotected sex.  Your condom covered your penis head so you were not exposed to hiv.
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