Elevated Serum Level of Fas Ligand Correlates With the Asymptomatic Stage of Human Immunodeficiency Virus Infection

To the Editor: Several reports have established an impotant role for Fas/Fas ligand (FasL) interaction in mediating programmed cell death of CD4+ lymphocytes in human immunodeficiency virus (HIV)-infected subjects.[1][1] ,[2][2] Soluble forms of the Fas receptor and its ligand have also been