obsolete_common variable immunodeficiency: ['A hypogammaglobulinemia that is results in insufficient production of antibodies needed to respond to exposure of pathogens and is characterized by low Ig levels with phenotypically normal B cells that can proliferate but do not develop into Ig-producing cells. Patients with common variable immunodeficiency have marked reduction in serum levels of both immunoglobulin G (IgG) and immunoglobulin A (IgA); about half of these patients also have reduced immunoglobulin M (IgM).', '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.', 'Heterogeneous group of immunodeficiency syndromes characterized by hypogammaglobulinemia of most isotypes, variable B-cell defects, and the presence of recurrent bacterial infections.']

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