NCIt related terms : Common variable immune deficiency (CVID); Acquired Hypogammaglobulinemia;
NCIt definition : A primary immunodeficiency characterized by low levels or absence of all the immunoglobulin
classes and lack of B-lymphocytes or plasma cells. It results in recurrent bacterial
infections. Complications include autoimmune phenomena and cancer development.;
Alternative definition : NICHD: Abnormally low level of functional immunoglobulins in the blood that is not
associated with a primary immunodeficiency.;