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What Is HIV and AIDS?

HIV is a virus spread through certain body fluids that attacks the body’s immune system, specifically the CD4 cells, often called T cells. Opportunistic infections or cancers take advantage of a very weak immune system and signal that the person has AIDS. AIDS, or Acquired Immune Deficiency Syndrome, is a disease in which there is a severe loss of your body’s cellular immunity, greatly lowering the resistance to infection and malignancy. The prevalence of HIV and AIDS varies widely by country. Over 1 million people in the US have HIV.