The median (range) duration of AIDS was 20.5 (0–240) months, with a mean (range) CD4-positive cell count of 489.8 ± 191.9 (185–915) cells/mm3.The CD4-positive cell counts were <200 cells/mm3, 200–500 cells/mm3, and >500 cells/mm3 in 3.8%, 63.5%, and 32.7% of patients, respectively. The gene discussed is CD4; the disease is AIDS.