AJTMH Transactions of the Royal Society of Tropical Medicine and Hygiene
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Am. J. Trop. Med. Hyg., 30(5), 1981, pp. 942-947
Copyright © 1981 by The American Society of Tropical Medicine and Hygiene

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Immunoenzymatic Assay (Elisa) in Mucocutaneous Leishmaniasis, Kala-Azar, and Chagas' Disease: An Epimastigote Trypanosoma cruzi Antigen Able to Distinguish between Anti-Trypanosoma and Anti-Leishmania Antibodies*

Maria Carolina Soares Guimarães, Beatriz Juliete Celeste, Euclydes Ayres de Castilho, José Roberto Mineo AND José Manoel Paiva Diniz
Laboratory of Immunology (Seroepidemiology), Instituto de Medicina Tropical de São Paulo, Department of Preventive Medicine, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil, and Instituto Adolfo Lutz de Registro, Estado de São Paulo, Brazil

Areas where mucocutaneous leishmaniasis, kala-azar and Chagas' disease are prevalent often overlap in Latin America. Due to a variable degree of cross-reactivity between the three etiological agents and antibodies synthesized during the course of the disease, a test able to distinguish between them is greatly needed. Saline-extracted antigen from live Trypanosoma cruzi epimastigotes behaved towards Chagas' disease sera in immunoenzymatic assays (ELISA) with the same specificity and sensitivity as the antigen used routinely for such tests. In tests using mucocutaneous leishmaniasis or kala-azar sera, the live T. cruzi antigen showed a much lower geometric mean titer (GMT) than the standard T. cruzi antigen. In ELISA tests with L. braziliensis antigen a higher GMT was seen with kala-azar sera than with those from cases of mucocutaneous leishmaniasis. Also, sera from Vale do Ribeira leishmaniasis showed higher GMT with an L. donovani antigen than with a homologous one. Such discrepancies were not seen in immunofluorescence tests employing the same sera and antigens.

Accepted for publication October 4, 1980.


* This study was supported by grant PDE 08-1-14 from the Conselho Nacional de Pesquisas Tecnológicas (CNPq).






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Copyright © 1981 by the American Society of Tropical Medicine and Hygiene.