[Should immunologic monitoring of toxoplasmosis seronegative pregnant women stop at delivery?].

The authors report 2 cases of congenital toxoplasmosis fortuitously diagnosed in 2 newborn infants aged 12 and 35 days respectively whose mothers had no anti-Toxoplasma antibodies detectable at the time of birth. These cases prompted us to carry out, over an 18 months' period, a systematic postnatal control of all pregnant women who were still seronegative at the time of delivery. This enabled us to detect 4 cases of perinatal maternal infection with Toxoplasma contamination in 2 neonates. In view of these results, and in order not to miss any maternal infection at the very end of pregnancy, it seems advisable to complete the control of seronegative women by taking a last blood sample about 30 days after they have given birth.