Common Variable Immunodeficiency

**Definition:** Heterogeneous group of immunodeficiency syndromes characterized by hypogammaglobulinemia of most isotypes, variable B-cell defects, and the presence of recurrent bacterial infections.

**Tree numbers:** - C20.673.330

**Synonyms:** - Common Variable Hypogammaglobulinemia - Common Variable Immune Deficiency - Immunodeficiency, Common Variable