Fig. 1.

Differences between the first version of Cobas TaqMan (CTM1) and Abbott RealTime (ABB) assay values (CTM1 − ABB = DIFF1) and differences between the CTM version 2 (CTM2) and ABB assay values (CTM2 − ABB = DIFF2) observed for each sample and for each patient. The medians are illustrated by the dark lines. The black circles indicate that one of the viral loads was undetectable and was replaced by the limit of quantification: 9 among the DIFF1 values (always with the CTM1 assay) and 5 among the DIFF2 values (always with the ABB assay).