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CDC HomeHIV/AIDS > Questions and Answers

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What is AIDS?
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En Español

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.

A diagnosis of AIDS is made by a physician using specific clinical or laboratory standards.

For more information see “What Causes AIDS?” and “What is HIV?”.

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Last Modified: October 20, 2006
Last Reviewed: October 20, 2006
Content Source:
Divisions of HIV/AIDS Prevention
National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention
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