Overview Study of Vitamin D3 Substitution to Patients With Primary Immunodeficiency Status: Completed Trial end date: 2011-06-01 Target enrollment: Participant gender: Summary Hypothesis: Cholecalciferol (vitamin D3) prevent respiratory tract infections in patients with primary immunodeficiency. Phase: Phase 1/Phase 2 Details Lead Sponsor: Karolinska University HospitalTreatments: CholecalciferolErgocalciferolsVitamin DVitamins