Epstein-Barr Virus Ab VCA IgG details

This antibody targets the viral capsid antigen (VCA) of Epstein-Barr virus (EBV), the virus responsible for infectious mononucleosis, and its IgG form indicates past infection — it typically appears within a few weeks of infection and then persists for life, similar to how immunity develops after many viral infections. Since the vast majority of adults have been infected with EBV at some point (often in childhood, without notable symptoms), a positive VCA IgG mainly confirms past exposure rather than indicating a current issue; when a recent or active infection needs to be assessed, VCA IgM and EBV early antigen antibodies are more useful.