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HIV stands for Human Immunodeficiency Virus (say: ih-myoo-nuh-dih-fih-shun-see). AIDS stands for Acquired Immunodeficiency Syndrome. HIV is actually the virus that causes the disease AIDS. To understand AIDS formation process, we need to know what an Immune System is (say: ih-myoon). Every person has body protective system.
By Mayo Clinic Staff. Acquired immunodeficiency syndrome (AIDS) is a chronic, potentially life-threatening condition caused by the human immunodeficiency virus (HIV). By damaging your immune system, HIV interferes with your body's ability to fight the organisms that cause disease. HIV is a sexually transmitted infection. It can also be spread by contact with infected blood or from mother to child during pregnancy, childbirth or breast-feeding. Without medication, it may take years before HIV weakens your immune system to the point that you have AIDS.