I have a question. So if i had sex with someone who has unknown hiv status, after about a year and half, I get hiv antibody test ( a third gen test i suppose that is)  and it comes back negative. I then had a couple more 4th gen tests over the years. Every since the third gen test, two years have passed, and i am doing all right with every test negative so far. My health seems okay and i had done a couple of body checks in hospitals and the results were all fine. My question is, i have read documents and news on how patients in the aids phase, which is the final phase of hiv infection, to not be able to produce antibodies any more, which means testing would come back negative for them. Is that common? If someone does not get treated for one and half year like i did, is it likely for he or she could remain healthy-ish i like i did for more than two years? 

I also heard if you do not have antibody detectable, antigen should then be detectable, is that true even in the final phases?

My final question would be, if i were injured by something sharp that may contain hiv blood, but my wound is too small to be noticed by my eyes and there is no visible blood, is there any risks for infection?

Thank you so much.

Rarely in persons with far advanced, end-stage HIV, after many years of infection and when infected persons are in a state of severe malnutrition, on rare occasions HIV antibodies may not be detectable, This is extraordinarily rare and in such patients a p24 antigen test would still be positive.   This would not occur after just a year and a half of infection

Your question about injuries by sharp things containing blood from an untreated HIV infected person is repetitive.  You will see answers to this question in our earlier exchanges.  EWH

Thank you again in advance doctor. You have been great to help.

This ends this thread.  No further questions please.  EWH