- common variable immunodeficiency [DOID:12177]
An agammaglobulinemia that is characterized by low Ig levels with phenotypically normal B cells that can proliferate but do not develop into Ig-producing cells and that esults in insufficient production of antibodies needed to respond to exposure of pathogens.
- X-linked agammaglobulinemia [DOID:14179]
An agammaglobulinemia that is that has_material_basis_in a mutation in the Bruton's tyrosine kinase (BTK) gene on the X chromosome resulting in X-linked agammaglobulinemia type 1, which is an immunodeficiency characterized by the failure to produce mature B lymphocytes, and associated with a failure of Ig heavy chain rearrangement.