A toxoplasmosis sero-epidemiological inquiry was effected with 2,324 sera collected from Libreville, Lébamba, Makokou, Lastourville and Woleu-Ntem. All the sera were first screened through Pastorex toxo (Diagnostics Pasteur). Those with more 8 IU/ml and 267 sera with less 8 IU/ml were then assayed by ISAGA (bioMerieux) for IgM. The results of ISAGA must be interpreted with carefulness for natural agglutinins are frequent in this population. The acquisition of immunity is precoce and more of 60% have a serology positive from ten years old. There was no difference between sex.
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