- Subjects with primary humoral immunodeficiency, namely with a diagnosis of Common variable immunodeficiency (CVID) as defined by the Pan-American Group for Immunodeficiency (PAGID) and the European Society for Immunodeficiencies (ESID), or X-linked agammaglobulinemia (XLA) as defined by PAGID and ESID, or autosomal recessive agammaglobulinemia who have participated in the study ZLB06_001CR and who have tolerated IgPro well