Figure 2.

EBV levels are shown as measured by three different viral load assays in 48 plasma samples from patients with EBV-related disease. EBV DNA was undetectable by LightCycler assay 1 in six patients who had low-level EBV by the other two assays. In the remaining 42 samples, Lightcycler assay 1 levels tended to be lower than those of the other two assays at levels below 1000 copies per ml, whereas the values were quite similar across the three assays for samples above 1000 copies per ml. It is not clear why the values of all three assays correlated most closely at higher rather than lower viral loads.