EBV load.

In peripheral blood of IM patients (IM), asymptomatic seroconvertants (AS), healthy control donors (HC), and negative controls (water, EBV⁻ PBMC, BJAB⁻). EBV genome copies were estimated by semiquantitative BMLF1 PCR-ELISA on PBMCs (see “Materials and methods”). UN indicates undetectable (less than 0). Specific descriptions of the IM and AS donors are outlined in Table 1.