POPULATION HIV-infected male and female subjects from 18 through 60 years of age receiving combination antiretroviral therapy (ART) without changes in the 24 weeks prior to enrollment (changes for reasons other than virologic failure allowed up to 8 weeks prior to enrollment), with a suppressed plasma HIV RNA (<200 copies/mL, one blip up to <1,000 copies/mL permitted) for at least 96 weeks and a CD4+ T-cell count ≥350 and ≤1,000 cells/mm3 at the time of study enrollment.