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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.
AIDS is not a disease per se but rather the stage of HIV infection where the body's immune system is severely compromised. Technically, AIDS is defined by either a CD4 count of under 200 cells per microliter (ÂµL) or by the diagnosis of a so-called AIDS defining illness.