If you're HIV positive and you continue to have unprotected sex, can you increase your viral load this way and is it true that if you are infected by someone that has the virus and has become immune to certain drugs then you will also be immune to these drugs? Also, if you're infected by someone that is not immune, but you don't get tested for HIV and it stays in your body a while does it then become immune to those drugs?

I prefer to use the term resistant to drugs and not immune. But you are correct. Resistant virus can be transmitted to another person. If you give drugs to this person that the transmitted virus is resistant to, they will not work. If you are infected with a virus that is not resistant to drugs, is unlikely, though possible, that the virus will develop resistance on its own. We don't know the answer to your first question. Only a few cases have been described in which an infected person was probably infected again with another strain. Viral loads did go up.

MH