Fig. 1From: Prenatal diagnosis and prevention of toxoplasmosis in pregnant women in Northern Vietnam: study protocolDiagnostic flowchart of congenital Toxoplasma gondii infection. Adapted from Van Haesebrouck et al. [28] and Montoya and Remington [27]. #Low avidity can be an indication of recent infection but should not be directly interpreted as recent infection [26]. *Amniotic fluid PCR can be performed starting from 18Â weeks of gestation onwards and at least 8Â weeks after diagnosis of seroconversion. The risk of the procedure should be carefully weighed against the potential benefit of diagnosing fetal infection [27]. pos, positive; neg, negative; US, ultrasound; PCR, polymerase chain reaction; TGS, Toxoplasma gondii specificBack to article page