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  • Title: A rapid slide flocculation test for the diagnosis of American trypanosomiasis using Trypanosoma cruzi fragments preserved by lyophilization. Comparison with hemagglutination, immunofluorescence, and complement fixation tests.
    Author: Hoshino-Shimizu S, Camargo ME, Umezawa ES.
    Journal: Am J Trop Med Hyg; 1975 Jul; 24(4):586-9. PubMed ID: 808144.
    Abstract:
    A slide flocculation test for Chagas' disease is described, which uses a lyophilized, stable antigen obtained by formalin and ultrasonic treatment of culture forms of Trypanosoma cruzi. The test was compared with other tests for the serodiagnosis of American trypanosomiasis and showed a high sensitivity, positive results being obtained in every case of acute or chronic Chagas' disease. In sera from blood donors and from normal individuals with negative T. cruzi antigen complement fixation tests a specificity of 96% was found. False positive flocculation tests were seen, especially in cases of South American blastomycosis and in a few cases of acute toxoplasmosis. Since it is easy and quick to perform, the slide flocculation test can be recommended as a screening procedure, especially for blood banks.
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