• Monozygotic twin girls discordant for acquired immunodeficiency syndrome were born to parents with antibodies to human T-cell lymphotropic virus type III. One twin had clinical evidence of the syndrome with tests positive for antibody, whereas the other at the age of 3 years was clinically, serologically, and virologically normal.
Menez-Bautista R, Fikrig SM, Pahwa S, Sarangadharan MG, Stoneburner RL. Monozygotic Twins Discordant for the Acquired Immunodeficiency Syndrome. Am J Dis Child. 1986;140(7):678-679. doi:10.1001/archpedi.1986.02140210076029