Sera were obtained from venous blood and stored at −20 °C until tested. Sandwich ELISA test kits EIA Toxoplasma IgG (Test-Line Clinical Diagnostics Ltd., Brno, Czech Republic) were used to evaluate serum samples for the presence of specific IgG antibodies to T. gondii. The index of positivity (IP) was calculated for each sample according to the formula: “IP = sample OD (optical density)/average cut-off OD”. Samples with IP >1.1 were considered positive.
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