[Congenital toxoplasmosis in twins: case report].

Congenital toxoplasmosis in twin pregnancies is infrequent. We present the case of a monozygotic and monocorial twin pregnancy with maternal toxoplasmosis infection diagnosed at 33 weeks gestation by detecting reactive IgM and IgG and low avidity test for IgG. The detection of the parasite in amniotic fluid could not be performed because the amniocentesis was not done.