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ELISA reactivity of two different sets of serum samples. The cut-off value is indicated for each experiment by a horizontal line. (A) Detection of a set of 95 IgG-positive (•) and 48 IgG-negative (○) human serum samples with the recombinant antigens GRA7, Tg34AR, and a combination of both; (B) detection of a set of 67 IgM-positive (•) and 25 IgM- and IgG-negative (○) human serum samples with the recombinant antigens GRA7 and Tg34AR.
