EBNA is a protein produced by EBV (Epstein Barr) during the later stages of infection. The presence of EBNA IgG antibodies usually indicates that the infection occurred some time ago, as these antibodies typically develop several weeks to months after the initial infection and remain detectable for life. Testing for EBNA IgG is often used in conjunction with VCA to distinguish between a current or past infection and to assess the stage of the infection....