Anonymous
Hi, my "exposure" was protected vaginal sex, to the best of my knowledge the condom did not break.

I had a 4 Generation HIV Test (Dynacare) at 47 days just to be on the safe side, it was non-reactive. I read that CDC (https://www.cdc.gov/hiv/basics/testing.html) and Catie (https://www.catie.ca/en/fact-sheets/testing/hiv-testing-technologies) regard the 4 Generation HIV Test as conclusive at any time beyond 45 days.

My question is, should I have another test at 3 months? Since my "exposure" was in South America, am I at any risk for HIV-2? Would HIV-2 be picked up conclusively at 47 days as well?

Thanks!
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Anonymous
Hello,

Thank you for your inquiry. From what we gather from the question, you were asking about the conclusiveness of a 4th Generation HIV test taken 47 days after a Low Risk exposure (evidence of transmission occurs through these activities when certain conditions are met).

Protected sex could meet the three components of the [Transmission Equation](https://www.aidswindsor.org/healthy-me/hiv-transmission/) if HIV containing fluids are able to gain access to your bloodstream. Getting an HIV test outside of the window period after such an exposure is a very responsible thing to do. With the 4th Generation test most HIV specialists agree that the results are conclusive after 6 weeks, but some physicians and guidelines still recommend retesting after 3 months for completely conclusive results (1). Since the 4th Generation test can accurately detect 99% of HIV infections after 6 weeks, it is very unlikely that the test result you received is incorrect. HIV-2 is a rare strain of the HIV virus that is prevalent in very few countries and in regards to HIV-2 testing, the antibodies to this strain of HIV would be detectable within the same time frame as HIV-1 antibodies using the 4th Generation test (2). The webpages you cited are great sources of information and I am glad you were able to access them to help with your situation!

Recommendation: Refer to a physician for more personalized answers and for an HIV test 3 months post-exposure (for completely conclusive results).

Regards,

AIDS Vancouver Helpline/Online, Marie
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