Definition of AIDS
AIDS: Acquired immunodeficiency syndrome, a syndrome caused by infection with the human immunodeficiency virus (HIV), with ensuing compromise of the body's immune system. Features include deficiency of certain types of leukocytes, especially T cells; infection with opportunistic infections that take advantage of the impaired immune response, such as tuberculosis, bacterial pneumonia, human herpes virus, or toxoplasmosis; certain types of cancer, particularly Kaposi sarcoma; inability to maintain body weight (wasting); and in advanced cases, AIDS dementia complex. Treatment for AIDS has advanced rapidly. Antiviral, antibacterial, and immune-boosting medications, among other treatments, are part of current treatment protocols. Last Editorial Review: 3/19/2012 Back to MedTerms online medical dictionary A-Z List 
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