Table 1. Correlation between expected results and automated extraction method performed as quality control for EBV DNA load measurement.

Expected results	EBV DNA load
Log copies	Log copies	Ct mean
2	1.94	30.63
3	2.90	27.48
4	3.96	24.00
5	4.97	20.69

The table lists Ct value and log copies/reaction using standard commercial EBV calibrators (EBV Q-PCR Alert Standard kit, ELITech Group, Puteaux, France). Negative cell-free CSF samples were spiked with EBV DNA concentrations ranging from 10⁵ to 10² copies/microl.