HIV is a virus. AIDS is a condition brought about by the virus HIV.
You can have HIV without having AIDS, and many people live for many years with HIV without ever developing AIDS. But if you have AIDS, you have to have HIV.
The NIH (National Institutes of Health) has more detailed information about the medical diagnosis of AIDS, which consists of having HIV plus having a very low count of CD4 cells. CD4 cells are part of the immune system, and are attacked/destroyed by HIV.
The best way to fight HIV is to know your status. A simple test can determine if you are infected with the virus.
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