Correlation between plasma neutralization titers and glycoprotein antibody levels. (A) Correlation between neutralizing ability against Epstein-Barr virus (EBV) infection of epithelial cells represented by 50% inhibitory dilution (ID50) and the IgG response against gH/gL, gB, gp350, and gp42. (B) Correlation between neutralizing ability against EBV infection of epithelial cells (ID50) and the IgA response against gH/gL, gB, gp350, and gp42. (C) Correlation between neutralizing ability against EBV infection of B cells (ID50) and the IgG response against gH/gL, gB, gp350, and gp42. (D) Correlation between neutralizing ability against EBV infection of B cells (ID50) and the IgA response against gH/gL, gB, gp350, and gp42.