In the 1990s a prenatal screening program of Toxoplasma infection was performed for 35940 pregnant women comprising 11 of Norway's 19 counties ( Jennum et al. 1998b). Of the women screened, 10.9% were Toxoplasma IgG positive. Evidence of primary infection during pregnancy was shown in 47 women, giving an incidence of 1.7 per 1 000 seronegative women. A significantly higher incidence was detected in the city of Oslo (4.6 per 1000) than in the rest of the country (0.9 per 1000) and among foreign women compared to Norwegian women (6 per 1000 versus 1.5 per 1000). Congenital infection was detected in 11 infants, giving an overall transmission rate of 23%, 13% in the first trimester, 39% in the second, and 50% in the third trimester (Jennum et al. 1998b). During the 1-year follow-up only one infant born to an untreated mother was found to be clinically affected (unilateral chorioretinitis and loss of vision). In Norway, the seroprevalence varied throughout the country. The lowest prevalences were detected in the North (6.7%) and in the inland counties (8.2%). A significantly higher prevalence was detected in the southern counties (13.4%), where mild coastal climate prevails (Jennum et al. 1998a).

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