Hello,
Thank you for your message, it is good to know that people take the time to appreciate our work. It seems that you are well informed about how HIV is spread. You must note however that the chances of HIV spreading through oral sex are very low and it is still very much debated how risky this activity is. It is nevertheless believed that there have been a few cases of HIV spreading during oral sex. A very good resource for information on the oral transmission of HIV is located at www.mpaetc.org/fdc_06/reznik_oralsex.ppt.
This can happen if infected blood from the mouth of the person giving oral sex (if there is a cut or sore and if you are HIV positive) enters the person they are giving oral sex to through the tip of the penis or the urinary tract. If the person received oral sex has HIV it can also spread from the semen or from blood if the penis has a cut or sore to the person performing oral sex if they have a cut or sore in their mouth.
In your case, as you said there are no visible cuts or sores on either the penis or in the mouth, your penis is only exposed to saliva and therefore chances of HIV infection are very low for you. There could however be the presence of microtears (not visible to the eye) and therefore it is good that you got tested.
Usually a test at 80 days is fairly accurate but as each person's window period (the period between HIV infection and the presence of HIV antibodies) can last different amounts of time (between 3-6 weeks to 3 months and sometimes more is some people) a second test is recommended usually at 6 months. There have been cases of people testing positive after 80 days.
The TRIDOT test is perfectly reliable (over 99%), it is simply a quicker test than the ELISA test which most healthcare centres use. It is the method many of our NGO partners such as Deep Griha Society use for confirmation. The only reason many websites say it is an outdated test is because there are always new methods on the market that might be considered easier to use, more reliable or cheaper to make. If you feel that TRIDOT is not good enough for you then you can discuss this with your doctor and ask for other test options. Most hospitals/clinics in Pune provide ELISA tests as well as TRIDOT and Western Blot. Sassoon Hospital usually use ELISA tests.
I hope this helps. All the best,
Dr Punewali