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Solubilization of Schistosoma mansoni antigens was obtained by agitation of adult worms in a 3M KCl solution. The protein contents of the KCl extrats varied from 0.35 to 0.96 mg/ml. Sera from 97 patients with hepatointestinal shistosomiasis and viable eggs in stools from a Brazilian endemic area were studied by immunoelectroomophoresis and Ouchterlony immunodiffusion methods with the KCl extract and with another antigen, obtained by homogenization of adult schistosomes in saline. The rate of positiveness of immunoprecipitation deterctions by immunoelectroomophoresis with the KCl extract was 53.5%. A correlation was verified between methods of detection and extration procedures, resulting in a better association of the extract obtained by agitation in 3M KCl and immunoelectroomophoresis. Foi obtida a solubilização de antígenos do Schistosoma mansoni por agitação de vermes adultos em solução de KCl 3M. O teor protéico dos extratos de KCl variou de 0,35 a 0,96mg/ ml. Foram testados pelos métodos de imunoeletroosmoforese (IEOP) e dupla imunodifusão (Ouchterlony), 97 soros de doentes de area endêmica brasileira de esquistossomose, forma clínica hepatointestinal e com exames coprológicos positivos para S. mansoni, com o extrato de KCl e outro antígeno obtido pela homogenização de vermes adultos em salina. A taxa de positividade das reações de imunoprecipitação por IEOP com o antígeno extraído pela ação do KCl 3M foi 53,5%. Foi verificada a correlação entre os métodos de detecção e de extração resultando numa melhor associação entre o extrato obtido por agitação no KCl 3M e a IEOP

Schistosoma mansoni antigenic extracts obtained by different extraction procedures