HIV and AIDS: The Basics | NIH - HIVinfo
https://hivinfo.nih.gov/understanding-hiv/fact-sheets/hiv-and-aids-basics
WebJul 25, 2023 · AIDS is the most advanced stage of HIV infection. HIV attacks and destroys the infection-fighting CD4 cells ( CD4 T lymphocyte) of the immune system. The loss of CD4 cells makes it difficult for the body to fight off infections, illnesses, and certain cancers. Without treatment, HIV can gradually destroy the immune system, causing health ...
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