AIDS stands for Acquired Immune Deficiency Syndrome. AIDS is the most advanced stage of HIV infection.
HIV causes AIDS by attacking the immune system’s soldiers – the CD4 cells. When the immune system loses too many CD4 cells, you are less able to fight off infection and can develop serious, often deadly, infections. These are called opportunistic infections (OIs) because they take advantage of the body's weakened defenses.
When someone dies of AIDS, it is usually opportunistic infections or other long-term effects of HIV infection that cause death. AIDS refers to the body’s immune-compromised state that can no longer stop OIs from developing and becoming so deadly.
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