Patients with CVID and selective IgG subclass deficiency with gastrointestinal symptoms of malabsorption, maldigestion, and chronic diarrhea will be enrolled into this study. Subjects (up to a total of 10 individuals) will receive a treatment dose of 270 mg (3 doses of 90 mg either single-use prefilled syringe or single-use vial, depending on availability) will be injected subcutaneously in subjects by qualified nursing staff on the Day 0 study visit. Subjects will then receive a follow up treatment dose of 90 mg at Week 8, Week 16, Week 24, Week 32 and Week 40 and be followed for a total of 48 weeks.