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Some people with lymphoma need an infusion of immunoglobulins to strengthen their immune system if their own antibody levels are low. People with chronic lymphocytic leukaemia (CLL) or who have had an allogeneic (donor) stem cell transplant are most likely to have this treatment. This factsheet explains what immunoglobulin replacement therapy id, who might need it, how it is gives, possible side effects, and what happens after treatment.