Lymphocytes CD8+ have been assayed prospectively in 245 individuals infected with HIV. Percentage and number of CD8+ have been nearly two-fold higher in asymptomatic patients or patients with lymphadenopathy than those in the control group. The number of CD8+ lymphocytes has been rapidly decreasing parallel to the progression of HIV (ARC and AIDS), while their percentage has increased--however insignificantly. There has been a positive correlation between the number of CD4+ and CD8+ cells and all clinical stages of HIV infection.