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Levels of EBV-specific IgG subclass in venous blood of mothers and their neonates. Anti-VCA-p18-specific (A) and anti-EBNA1-specific (B) IgG subclass antibodies in cord blood (CB) and maternal venous blood (VB) at delivery were measured by ELISA. Arbitrary units were calculated by dividing the test sample ODs by the mean OD plus 2 standard deviations (SDs) of the negative-control sera. Horizontal bars represent the means, and only significant P values are shown in the figure.
