Replacement therapy in: • Primary immunodeficiency syndromes such as: - congenital agammaglobulinaemia and hypogammaglobulinaemia - common variable immunodeficiency - severe combined immunodeficiency - Wiskott Aldrich syndrome. • Children with congenital AIDS and recurrent bacterial infections. Immunomodulatory effect: • Idiopathic thrombocytopenic purpura (ITP) in children or adults at high risk of bleeding or prior to surgery to correct the platelet count. • Guillain barre syndrome. • Kawasaki disease. Allogeneic bone marrow transplantation.• Myeloma or chronic lymphatic leukaemia with severe secondary hypogammaglobulinaemia and recurrent infections.