Actually, let me set the record straight…. AIDS is not the root issue, HIV the root issue. That being said, there are actually two main types (referred to as Type 1 and Type 2).
The interesting thing about this is that the roots of HIV-1 are more commonly found within North America which roughly traces back to Europe of all places, but didn't become catastrophic until it reached the US population, starting in California. HIV-2 on the other hand is more common to Africa, and has a distinctly different makeup than the HIV-1 virus that is more prevalent within North America.
Now that all being said, it is important to understand the key difference between HIV and AIDS.... HIV is merely the presence of the virus, however AIDS is technically classified as a CD4 count below 200, which is where other illnesses can begin to set in and create real problems. For those that do not know, the CD4 cells are the particular cells found within your white blood supply that your immune system uses to fight off any foreign substance/matter within your body. In short, the lower the number equates to the more danger you are in, and the higher the number equates to the stronger your system is.
After posting this, I noticed another interesting comment with regards to the lack of protection in Africa
Viral Load is another key thing to take into account when assessing the risks. The only known way in which to suppress the viral load to keep the virus at bay is with proper medications. The problem comes in here where the big pharma companies are all greedy and charge outrageous amounts for their medications, even though the R&D is already long ago paid for. I'll bet that you didn't know that in North America alone (where the companies are the greediest), the average cost of medications to keep someone with HIV alive are approximately $2000 - $4000 for a 30 day supply, depending on the particular pharmacy that you go to. The bigger the pharmacy chain, the more they'll charge. These kinds of prices are just not affordable to the masses, particularly in places like Africa. Granted, the medications you'll find in Africa are much different than the ones that you will find within North America for two different reasons, the biggest of which being the US pharma companies are too greedy to make their drugs affordable to the masses.