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Acquired immunodeficiency syndrome (AIDS)

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Acquired immunodeficiency syndrome (AIDS) is the most severe stage of HIV infection. HIV attacks and destroys a type of white blood cell called CD4+ cells, or helper cells. These cells are an important part of the immune system. If HIV is not treated, it will usually get worse over time and cause AIDS.

A person who has HIV is diagnosed with AIDS when they have one or both of the following:

  • A CD4+ cell count below 200 cells per microliter (mcL) of blood.
  • Certain infections or cancers that are usually seen only in people who have problems with their immune system. Examples include infections such as Pneumocystis pneumonia and cancers such as Kaposi sarcoma.

Treating HIV can help the immune system stay healthy. This may delay or prevent AIDS.

Current as of: April 30, 2024

Author: Ignite Healthwise, LLC Staff

Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

Current as of: April 30, 2024

Author: Ignite Healthwise, LLC Staff

Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

The Health Encyclopedia contains general health information. Not all treatments or services described are covered benefits for Kaiser Permanente members or offered as services by Kaiser Permanente. For a list of covered benefits, please refer to your Evidence of Coverage or Summary Plan Description. For recommended treatments, please consult with your health care provider.