A rare genetic primary immunodeficiency due to a defect in adaptive immunity disorder with characteristics of normal or elevated IgM serum levels with low or absent IgG, IgA and IgE serum concentrations, which manifests with recurrent bacterial sinopulmonary and gastrointestinal infections, with frequent lymphoid hyperplasia (peripheral lymphadenopathy, tonsillar hypertrophy), with no increased susceptibility to opportunistic infections. Autoimmune manifestations (including immune cytopenias, arthritis and hepatitis) are occasionally associated. Immunologic findings reveal absent immunoglobulin class switch recombination and lack of defect of immunoglobulin somatic hypermutations in the presence of normal numbers of CD27+ memory B cells. [from
SNOMEDCT_US]