_:vb50936598 . _:vb50936598 "A selective immunoglobulin deficiency disease thatis a dysgammaglobulinemia resulting from decreased levels of immunoglobulin M (IgM) production to roduction of other antibodies."^^ . _:vb50936598 . _:vb50936598 "url:http://en.wikipedia.org/wiki/Isolated_primary_immunoglobulin_M_deficiency"^^ . _:vb50936598 "url:http://en.wikipedia.org/wiki/IgM"^^ . _:vb50936598 . _:vb50936598 . _:vb50936598 .