Summary of clinical data from the six participants. Keys define the symbols and colors used for antiretrovirals, plasma HIV-1 RNA, and blood CD4+ cell concentrations. The multicolored circles and squares in the middle of the graphs indicate the dates on which specimens were collected. ATZ/r, atazanavir-ritonavir; RTV, ritonavir; NVP, nevirapine; d4T, stavudine; 3TC, lamivudine; ZDV, zidovudine; NLF, nelfinavir; ddI, dideoxyinosine; EFV, efavirenz; LPV, lopinavir; SQV, saquinavir; TNF, tenofovir.