Viral load greater than 10,000 copies/mL on available optimized combination antiretroviral therapy, to include at least 3 drugs, one of which is a non-nucleoside reverse transcriptase inhibitor (NNRTI), integrase inhibitor, or protease inhibitor. Patients not on combination antiretroviral therapy will be eligible, but must be willing to resume combination antiretroviral therapy and to have had a viral load greater than 10,000 copies/mL after at least 2 weeks of therapy.