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Serum IgG Titers Against Toxoplasma gondii in Uninfected Infants Exposed In Utero to Toxoplasmosis. OBJECTIVES: To describe the mean time of decrease of T. gondii IgG titers in uninfected infants exposed in utero to toxoplasmosis. METHODS: A retrospective cohort study was conducted between 2008-2017, among infants under 12 months and exposed in utero to toxoplasmosis. Serial monthly monitoring of serum IgG titers were done till undetectable levels. RESULTS: 240 infants with mean gestational age at diagnosis of 19.2 weeks were included in the study. The mean (range) time for IgG level to become undetectable was 7.9 (0.8-25.0) months. 14 infants became negative between 13-24 months. CONCLUSIONS: Majority of asymptomatic infants exposed in utero to T. gondii become seronegative before 12 months of age.