[Anti - T. gondii antibody concentration in sera of pregnant women in the sample of Lódź population]. 
The aims of the study were: to estimate the prevalence of Toxoplasma gondii in pregnant women in the Lódź region; to assess the rate of incidence of suspected recent infection based on the results of the standard test for specific anty -T. gondii IgG and IgM antibodies.  The study covered 1920 pregnant women served in 1998 by Toxoplasma Reference Laboratory in Lódź.  T. gondii specific IgG and IgM were quantitated by an enzym-linked immunoabsorbent assay (ELISA, Organon).  We have demonstrated high prevalence of T. gondii among pregnant women in the Lódź region.  In the analysed sample of Polish population the T. gondii-specific IgG with negative IgM occurred in 43.4% (n = 837).  In 1.42% of pregnant women IgG and IgM specific antibodies were detected.