Does the Human Immunodeficiency Virus come before the Aquired Immune Deficiency Syndrome?

Most doctors believe that HIV is the virus that causes AIDS. However, there are a few people who appear to be immune to the disease; they carry the HIV virus, but never get AIDS. And many people who suffer from "acquired" immune system disorders do not have the HIV virus. Just as smoking does not inevitably CAUSE lung cancer, but brings a highly increased RISK of lung cancer, there are a few doctors who believe that HIV does not cause AIDS, but merely makes you more susceptible to something else that does.

It seems likely that additional research will provide more information about the exact nature of the HIV/AIDS relationship.