fig2

Figure 2. Detection of affinity of EBV-CA IgG. EBV-CA IgG antibody in CSF is indicated by green fluorescence. High affinity of antibody reveals that green fluorescence still exists after CSF is treated with urea. Disappearance of green fluorescence after CSF was treated with urea demonstrates low affinity of the antibody. EBV: Epstein–Barr virus; CA: Capsid antigen; EA: Early antigen; IgG: Immunoglobulin G; IgM: Immunoglobulin M; CSF: Cerebrospinal fluid; EBNA: Epstein–Barr nuclear antigen