This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. This study will determine the antiviral activity and safety of UK-427,857, one of a new class of compounds that appear to block entry of CCR5-tropic HIV-1 into cells. In this multi-center, double blind, randomized (1:1:1) study, participates will be assigned to receive UK-427,857 (300mg once daily or 300mg twice daily) added to zidovudine/lamivudine (300mg/150mg twice daily), compared to efavirenz (600mg once daily) added to zidovudine/lamivudine (300mg/150mg twice daily. Participants will be HIV-infected antiretroviral treatment-nanve, since the vast majority of individuals who are anti-retroviral nanve are infected with CCR5-tropic virus only. Subjects will have 17 study visits with 96 weeks of treatment and undergo physical exams, laboratory and electrocardiogram testing.
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