Treatment-Change Episode (TCE) Viewer. TCE Viewer plots (i) antiretroviral (ARV) regimens, plasma HIV-1 RNA levels, and CD4 counts surrounding a treatment change (upper right); (ii) genotypic resistance test results (bottom); and (iii) a summary of the past ARV history (upper left). ARVs are shown beneath the TCE timeline; plasma HIV-1 RNA levels in log copies/ml are shown in red; and CD4 counts are shown in blue. Plasma HIV-1 RNA levels below the limits of quantification are indicated by inverted triangles. Genotype times are indicated by numbered vertical dotted lines. Genotypic resistance test results list amino acid differences from the consensus B protease and RT sequences. Nucleoside-, nonnucleoside, and protease inhibitor resistance mutations are colored. The past history summary shows the CD4 nadir and a list of past ARV regimens. For each past regimen, the plasma HIV-1 RNA levels rounded to the nearest log10 value and the last CD4 count are shown.