FIG. 1.

Comparison between the results of GIPL ELISA employing the enriched GIPL fraction (F2) and the commercial IgM-capture ELISA (Abbott Co.) employing tachyzoite extracts to measure the levels of anti-Toxoplasma IgM in serum. r, correlation index for the two tests. Assays were performed without knowledge of the patient's status regarding levels of T. gondii-specific IgM or IgG in serum. Indexes for capture ELISA and IgM-GIPL ELISA were calculated as the absorbance of the tested serum divided by the average of absorbances of negative control sera. Sera were considered positive if the index was >1.6.