Toxoplasma prevalence among pregnant women in Norway: a cross‐sectional study

Infection by Toxoplasma gondii may lead to complications in the foetus if the mother suffers from primary infection during pregnancy . Previously infected women have produced toxoplasma‐specific IgG antibodies. The most recent study on prevalence of toxoplasma IgG in the Norwegian pregnant population was conducted 20 years ago. The present study is part of a research programme initiated by the Norwegian Institute of Public Health. We aimed to update the knowledge regarding the prevalence of toxoplasma IgG among pregnant women in Norway. In this cross‐sectional study, sera from 1922 pregnant women in Buskerud (992) and Sør‐Trøndelag counties (930) in Norway were collected consecutively. The presence of toxoplasma IgG was identified by values ≥8 IU/mL using an ELISA test. The overall prevalence of toxoplasma IgG seropositivity was 9.3% (95% CI 8.1–10.7); Sør‐Trøndelag 10.4% (95% CI 8.6–12.6) and Buskerud 8.3% (95% CI 6.7–10.2). There was no difference between the counties (p = 0.13), and the result did not differ from prevalences found in 1974 (12.1%) and 1994 (10.7%). We found a higher prevalence among women ≥40 years (OR 2.65, 95% CI 1.30–5.42). The prevalence of toxoplasma IgG among pregnant women in Norway is low and has been stable during the last decades.