_:vb50954518 "A B cell deficiency that is characterized by deficiency of an immunoglobulin subtype. The clinical course and prognosis is dependent upon the severity of the selective deficiency and associated morbidity."^^ . _:vb50954518 . _:vb50954518 . _:vb50954518 . _:vb50954518 "url:https://www.ncbi.nlm.nih.gov/books/NBK507905/"^^ . _:vb50954518 . _:vb50954518 "url:https://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&ns=ncit&code=C27870"^^ . _:vb50954518 . _:vb50954518 .