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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.
What Are HIV and AIDS? HIV (human immunodeficiency virus) is a virus that most likely mutated decades ago from a virus that infected chimpanzees to one that infects humans. It began to spread beyond the African continent in the late 1970s and is now endemic worldwide.