HIV (Human Immunodeficiency Virus) is a virus that attacks the body's immune system, specifically the CD4 cells (T cells), which help the body fight infections. If left untreated, HIV reduces the number of CD4 cells, making the person more vulnerable to infections or certain cancers. Over time, HIV can lead to AIDS (Acquired Immunodeficiency Syndrome), which is the final and most severe stage of HIV infection.


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