NORA [ Nevirapine OR Abacavir study , a sub-study of the Development of AntiRetroviral Therapy in Africa ( DART ) trial ] randomized 600 symptomatic HIV-infected Ugandan adults ( CD4 cell count < 200 cells/mm ( 3 ) ) to receive zidovudine/lamivudine plus abacavir ( cABC arm ) or nevirapine ( cNVP arm ) .