Introduction: Systemic Lupus Erythematosus (SLE) is an autoimmune disease whose clinical manifestations are characterised by periods of exacerbation interspersed with periods of relative quiescence. Autoantibody overproduction is a hallmark of the disease which has been ascribed to a B-cell hyperactivity; which of late its thought to be T-cell driven and/or sustained. Thus we have studied phenotypic alterations found in CD2+ (T and NK) cells from SLE patients in relation to the activity of the disease.