Why is it difficult to create a vaccine for AIDS?as we do for other viral diseases?

i dont need any funny answers...jus the technical details....i know completely about AIDS except this....pls tell me

AIDS is caused by the human immunodeficiency virus or HIV. This virus is a sphere with a coating of complex molecules. Its structure allows it to fit into corresponding molecules on the surface of immune system cells. Once inside these cells, it takes over their chemical mechanisms. It starts turning out strings of proteins, which then come together to form new viruses until the cell's resources are exhausted. Under this attack the immune system eventually falters.

To fight AIDS we work to find a cure, or even better, immunity. The curative approach attempts to find a way to deal with the virus once it's operating in our cells. Drugs like AZT block critical steps in the HIV life cycle. The immunity approach requires the development of a vaccine to stimulate antibody production to fight off the virus.

The big problem in all treatments is HIV's rapid rate of mutation. Every virus that comes out of a cell is slightly different from the one that went in. It doesn't take long for drug resistant viruses to appear in the blood. Like the common cold, the HIV virus changes so fast that it's difficult to develop an effective vaccine.

AIDS is a retro virus that changes its DNA so it is hard to destroy. It evolves so to speak to survive. Most vaccines take a dead virus or a very weak virus and inject it into the body so the body's immune system can adapt to it by recognizing it and assigning antibodies to kill that particular strand. AIDS is always changing and does not stay the same, making finding a vaccine for it hard. The best thing to do in that case is to suppress it

HIV adapts & evolves as a defensive response to medicines
( poisons ) that would kill it...

Ok, all the other answeres are copied from some website, trust me. In lamest terms, the aids virus attacks our healthy cells, and when they attack, it stops the healthy cells from sending "messages" to the anti-body cells. We cannot get the cure because we do not know why our body does not send out signals for help. Hope this helped!

all of the above statements are true... but this is also because the virus is directly hitting our T4 lymphocyte cells... these cells are those responsible for disease combat... they are our immune defense system... since the virus would invade these cells and change the dna as well as the rna of the cell, it can't function anymore as what it really should function... and since retroviruses multiply in such a short span of time, then the suppose to be growth of the normal T4cells are totally out of control and the cell itself is totally invaded... hence, the deffense system of the body fail and could no longer fight or adapt to medicines in the case of the terminal stage of aids... that's why,the most cure or rather remedy that they have yet discover is to suppress its growth... but since it reproduce too fast, we can't really suppress and kill them all...
and since the main target is the immune defense system of the body, as it gets worst, immune defenses go down and some complications evolve... most likely the pulmonary or the respiratory... and some other... sometimes... the person would die not of the aids itself but because of the too many complications of aids... coz it will really rip and destroy our immune system... thus shutting the system/s of the body down..

since u know everything, u should know why it is difficult