In vitro research also allowed scientists to see the HIV molecule interact with the cell. From the knowledge gained about cellular processes, such as HIV (yellow) interacting with the white blood cell, we have learned almost everything we currently know about AIDS - like the fact that animals do not contract AIDS!
How will we combat AIDS without animal experimentation?
Over the last 20 years, billions have been spent fruitlessly trying to infect animals with AIDS. Given the inability to produce an adequate animal model, it is foolish to assume that animal experimentation will lead us to a cure. Many in the AIDS community - with their lives on the line - actively demonstrate against animal experiments as a waste of precious time and money.
Blood from those infected with HIV remains our most illuminating research material to date. Humans who do not progress from HIV to AIDS offer excellent insight to possible ways of countermanding the disease. 
Through epidemiology and in vitro research, scientists have already isolated the human gene believed responsible for their immunity. Though proponents of animal testing claim AZT and other preventative medications for AIDS were developed through animal research, existing human data and computers were in fact responsible. 
AIDS kills humans at the cellular level, so that is where it needs to be studied. Mindlessly investing valuable research funding in animal experiments only keeps AIDS patients ill.[19-22]
Aidsvax was tested on 8,000 high-risk volunteers because it protected chimpanzees from HIV infection. Unfortunately for the volunteers, it afforded them no protection whatsoever.