Seroprevalence of Toxoplasma gondii among pregnant women in Sweden

Background. Primary infection with Toxoplasma gondii during pregnancy can cause fetal infection with a risk of complications for the fetus. The proportion of women at risk of acquiring the infection during pregnancy in Sweden is not known.Methods. The seroprevalence of Toxoplasma gondii among pregnant women in Sweden was calculated when 40 978 blood samples collected on filter paper eluates from newborns were tested for Toxoplasma specific immunoglobulin G. The newborns in two geographically different areas (Stockholm County and Skane County) were investigated during a 16-month period between April 1997 and July 1998. The anti-toxoplasma IgG antibodies detected in the eluates were considered to be of maternal origin and to reflect the immune status of the mother.Results. The seroprevalence was 14.0% in Stockholm County and 25.7% in Skane County. The seroprevalence among women born in the Nordic countries was 11.1% in Stockholm and 24.9% in Skane. The corresponding figures for women born outside the Nordic...