Test Details: Toxoplasmosis is an infection caused by the parasite Toxoplasma gondii. The IgG avidity ELISA test could measure the avidity of specific IgG in acute and chronic phases of toxoplasmosis. The avidity of IgG is low in acute phase and high in chronic phase of toxoplasmosis, therefore, detection of a low IgG avidity is a reliable indicator for recent toxoplasmosis, whereas detection of a high IgG avidity shows that the infection had occurred in the previous 3-5 months. High avidity (AI≥60%) means that Toxoplasma infection was acquired before 3 months ago, whereas borderline avidity (50%<AI<60%) means infection at an indeterminate period and low avidity (AI≤50%) means that the infection was acquired within the last 3 months.