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Comparison of IgM and IgG antibody levels obtained by VCAp18-MIXO(P,G) ELISAs for patients diagnosed as having primary (circles) or past (squares) EBV infection based on the results of the two reference tests (VCA-EA-EBNA-specific IgM ELISA and VCA IgG-EBNA antibody profiling). The diagonal line bisecting the figure is the limit of identity between IgM and IgG absorbance values. OD, optical density.
