What is AIDS? Complete Definition and History of This Fatal Disease

AIDS stands for Acquired Immunodeficiency Syndrome.
Acquired - means that the disease is not hereditary but develops after birth from contact with a disease causing agent (in this case, HIV).
Immunodeficiency - means that the disease is characterized by a weakening of the immune system.
Syndrome - refers to a group of symptoms that collectively indicate or characterize a disease. In the case of AIDS this can include the development of certain infections and/or cancers, as well as a decrease in the number of certain cells in a person's immune system.
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