[Update on toxoplasmosis prevalence based on serological tests in pregnant women in Dakar, Senegal from 2002 to 2006]. / Evolution de la séroprévalence de la toxoplasmose chez la femme enceinte a Dakar, Sènegal de 2002 a 2006.

The purpose of this study was to update data on toxoplasmosis antibody prevalence based on antenatal surveillance tests in pregnant women in Dakar, Senegal. The study population consisted of 941 pregnant women referred for diagnosis of toxoplasmosis in the Laboratory of Parasitology and Mycology at Le Dantec University Hospital Center from 2002 to 2006. Two tests using the solid-phase immunoenzymatic method were performed on venous blood samples collected at 3 weeks of interval (S1 and S2). This double testing technique was designed to detect increases in IgM and IgG antibody levels in order to confirm diagnosis of toxoplasmosis by ruling out immune response, acquired immunity or nonspecific antibody fixation. Comparison of S1 and S2 results in the 941 patients indicated a prevalence of 7.7% and 0% respectively for IgM+IgG- cases, 23.3% and 24.3% respectively for IgM+IgG-cases, and 11.3% and 10.2% respectively for IgM+IgG+ cases. The overall prevalence of toxoplasmosis antibodies was 34.5%. These data showing a high prevalence of toxoplasmosis among pregnant women in Dakar underscore the need to improve serological screening and follow up.