In HF/CMH-Argentina, patients who were LTFU tended to be in more advanced stages of disease at ART initiation than those who remained in care, but much less advanced stages compared to those who subsequently died (median CD4=197, 166, and 50 cells/μL for alive, LTFU, and dead, respectively; proportion with AIDS=18, 27, and 55%, respectively). The gene discussed is CD4; the disease is hydrops fetalis.