RESUMO
Congenital toxoplasmosis is a consequence of a first infection during pregnancy. A descriptive study was carried out in a sample of 181 pregnant women. This sample was representative of a universe integrated by pregnant women from 3 policlinics of La Lisa municipality, Havana City, booked from March to September 2004, with the aim of identifying those with acute or recent toxoplasmosis infection. As well, the follow-up and control of seronegative pregnant women was also conducted. The sample size was determined through a simple, randomized sampling. The serological method of Indirect Immunofluorescence (IFI) was used to detect the IgG and IgM anti-Toxoplasma antibodies, and the molecular method of the Polymerase Chain Reaction (PCR) to confirm infection in blood or amniotic fluid. One of the patients of this study, who was at her 18th week of gestation with acute infection and probable congenital transmission, showed seroconversion with IgG antibody titters of 1/256 and 1/2048 in her first and second sera, respectively. The result of the IgM detection was of 1/32. These findings demonstrate a 44,2% of seroprevalence of T. gondii infection in a pregnant women population