Every illness, no matter how grave its effects or how untreatable it may be to modern medicine, has at least a small group of people who have an immunity to it. And believe it or not, there are actually people who are immune to HIV. There is even research to suggest that it may be a small number of people who are of European descent, and whose ancestors lived through (due to their immunity to) the Bubonic Plague. Apparently, because of a particular protein in their genetic makeup, both the Bubonic Plague and HIV are unable to establish a foothold within their cells, and end up dying off due to their inability to sustain and propagate themselves within these people’s bodies.
While you most likely would not initially associate the Bubonic Plague’s impact on Europe with having any sort of a resistance to HIV infection, apparently they do share a connection in that they establish themselves within the cells of the people they infect in a similar way. Of course, this should not be a cause for people to begin assuming that because their ancestors came from Europe that they can engage in unprotected sex and intravenous needle usage, it is rather fascinating to think that there may be a fairly large group of people in this world who will neither contract HIV nor the Plague, regardless of how often they may be exposed to either.
And until this connection can be explored in greater detail, the general public might not even be ready to really understand this relationship between these two dreaded diseases. After all, the effects could be devastating to the effort against AIDS if a large number of people believed that having European descent was enough to prevent them from ever contracting AIDS. The percentage of European descended people who actually are immune is potentially very small, after all. The fact that there is anyone at all, however, is more than incredible.