It is now known that under specific conditions and with special treatment, blood stem cells (the cells that make blood) can be transferred or transplanted from one person to another. Stem cell transplantation has been done for patients with CGD who have a healthy brother or sister and who share the same immune type (HLA type) as the patient. Stem cell transplantation allows healthy or normal white cells from the stem cell donor to grow or develop in the patient's bone marrow making the donor's white cells. These healthy white cells can fight infection and prevent future infections for a patient with CGD.