FIG. 1.
Representative fivefold dilution series of HIV-1 group M and group O isolates. (a) Group M subtypes A, B, C, and D. (b) Group M subtypes CRF-AE, F, and G and group O. Log10 RNA copies per milliliter are plotted versus the dilution series order, whereby numbers 1 through 7 correspond to neat, 1:5, 1:25, 1:125, 1:625, 1:3,125, and 1:15,625 dilutions, respectively. Quantitative values and linear regression trend lines for each of the three commercial viral load tests are shown as follows: solid circle and solid line, LCx HIV assay; open circle and dotted line, MONITOR v1.5 test; and triangle and dotted-dashed line, bDNA v3.0 assay.