1.I got tested for HIV on days 58(negative), 72(negative), and 91(negative) after a questionable sexual encounter, but I don't know the generation of the test. I think it was a 3rd generation ELISA test. Will my test results change at the 6th or 12th month? I don't have any health issues. 

2.Do you think maintenance of the machines used for the tests is being done? Is there a possibility of false negative results? I read somewhere that someone tested negative after 2 months and then tested positive after 6 months. Do you think this could be true? 

3.How many days after being infected with HIV can a person transmit it to others? 

4.Do I have a chance of being an elite controller? Can my body produce HIV antibodies in this case? 5Can I engage in sexual intercourse with my partner now? Can I transmit HIV to them under these circumstances Can I believe that I am negative based on this? tnks

You needn't worry:  you definitely do not have HIV. Before getting to your questions, I will comment that probably there was almost no chance of HIV from the sexual exposure described. Even among the most sexually active women in North America and Europe, typically fewer than one in a thousand has HIV. And of all cases of fever, HIV is among the most rare. Finally, when a woman has HIV, the average transmission risk is once for ever 2,500 episodes of unprotected vaginal sex. But probably more important to you, your negative test results are completely reliable. 

1. It never takes more than about 8 weeks for the third generation HIV antibody tests to become positive -- and all your tests were done beyond 8 weeks (56 days). 

2. The test procedures are highly automated, and patient tests always are run simultaneously with controls, i.e. with known negative and positive specimens. When those results are as expected, it means the test result is valid. The procedures are more or less foolproof and machine maintenance is unlikely to make a difference. I am unaware of any reliable reports of the test results you describe ("I read somewhere....")

3. People are infectious for others starting 8-10 days after infection. But you aren't infected, so this is irrelevant to you situation. You cannot possibly infect anyone with HIV.

4. This is a common misconception. Elite controllers test positive an all the standard HIV tests, including the antibody tests. Indeed, they are elite controllers because they have an especially strong immune response to the virus.

There is no possibility you have HIV. Do your best not to worry. You do not need any more HIV tests.

I hope these comments are helpful. Let me know if anything isn't clear.

HHH, MD

My doctor says it could take 6-12 months for the body to produce late antibodies. Is this possible? That's why my mental state is affected.

What country are you in?

I'm glad you reside in a medically sophisticated country! And you are correct about the blood test result. It rarely if ever takes more than 8 weeks for positive results with the current standard (third generation) HIV antibody tests. And once antibody is present, the test remains positive for life. There are no reliable reports of reversion to negative.

That concludes the two follow-up comments and replies included with each question and so ends this thread. I hope the discussion has been helpful. Best wishes and stay safe.