<prompt> Adenosine deaminase deficiency is seen inSevere combined immunodeficiencyWiskott Aldrich syndromeAgammaglobulinemiaHIV  <response>: Ref Robbins 8e p244, 9e p239 Adenosine deaminase ADA deficiency is an inherited disorder that damages the immune system and causes severe combined immunodeficiency SCID. People with SCID lack viually all immune protection from bacteria, viruses, and fungi. They are prone to repeated and persistent infections that can be very serious or life-threatening. These infections are often caused by oppounistic organisms that ordinarily do not cause illness in people with a normal immune system 