The avidity result is determined using:

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The avidity result is determined using the ratios of antibody titration curves of urea-treated and untreated sera.Studies of the avidity of IgG in pregnant women who have seroconverted during gestation have shown that women with high-avidity test results were infected with T.gondii at least 3 to 5 months earlier (time to conversion from low-avidity to high-avidity antibodies varies with the method used).Because low-avidity antibodies may persist for many months,their presence does not necessarily indicate recently acquired infection.

The Avidity Result Is Determined Using