[Multicenter study on the prevention of congenital toxoplasmosis in Buenos Aires].

Toxoplasmosis is an infection caused by Toxoplasma gondii, an intracellular parasite of universal distribution, with a variable prevalence depending on the region. This infection causes both morbidity and mortality in the fetus and newborn. The present study is an evaluation of the Argentine Consensus Guidelines regarding prenatal prevention of toxoplasmosis. Screening tests in pregnant women were done in nine different hospitals within the city of Buenos Aires and surroundings, where 19825 births between May 1st 2006 and April 30th 2007 were registered. Screening tests were done in 13632 pregnant women, using IgG and IgM determinations by ELISA. If acute infection was suspected, the patient's serum was sent to the reference laboratory to fulfill the pending tests: Sabin Feldman, ISAGA M, ISAGA A, ISAGA E and avidity. Clinical and serologic evaluation was done to all newborn of these mothers. Three hundred and fifty one specimens were sent and analyzed. Conclusions from the analysis were as follows: 121 (32%) patients probably acquired the infection during pregnancy, in 176 (46%) patients, acute infection was excluded, in 37 women (10%) serologic results were inconclusive, and in 47 (12%) the interpretation of results was impossible due to lack of information on the exact gestational age. Clinical and serologic control was performed in 94 newborns of mothers infected during pregnancy, and 5 congenital toxoplasmosis were detected, with fetal damage, four corioretinitis and one case of microcephaly. This study allowed us to validate the Argentine Consensus of Congenital Toxoplasmosis Guidelines.