There is substantial evidence that rIL-2 increases CD4+ cell count. Whether or not rIL-2 delays progression to AIDS and extends survival is currently unknown, such clinical benefits of rIL-2 can only be established in a large, long-term, randomized trial. This study examines the effect of two different rIL-2 doses on HIV viral burden and CD4+ cell count and provides additional information on optimal dosing, safety, and antiviral activity of rIL-2.