A seroepidemiological study including a population of 3,196 pregnant women was carried out in Havana City, to identify the presence of IgG/anti-Toxoplasma gondii antibodies, their concentration (ui/mL) and the expected number of primary infection. 50.59% of the pregnant women were positive to T. gondii 37.41%, of the total positives, reported concentrations of specific antibodies greater than 100 ui/mL.The evaluation of fundamental aspects related to this parasite infection is urgently recommended as part of the National Programme for Pregnant Women.