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Micro Enzyme-Linked Immunosorbent Assay (ELISA) for the Serodiagnosis of New World Leishmaniasis^*

Of 21 confirmed cases of New World leishmaniasis, 16 exhibited antibody to antigens of the promastigote of Leishmania braziliensis panamensis by the enzyme-linked immunosorbent assay (ELISA). Comparison of antibody titers obtained by ELISA with titers obtained by indirect immunofluorescence using an amastigote substrate confirmed that the sensitivities of the two techniques were within the same range (r = 0.80). Although sera from patients with New World leishmaniasis failed to react with antigens extracted from epimastigotes of Trypanosoma cruzi, sera from 39 cases of Chagas' disease were reactive with promastigotes of L. braziliensis panamensis. This apparent unidirectional cross-reactivity has been attributed to differences in potency of the antigenic stimulus presented in the two diseases.

Accepted for publication June 2, 1979.

^* Address reprint requests to: Dr. Ronald L. Anthony, Clinical Immunology Laboratory, Room 2-1250, University of Maryland Hospital, 22 South Greene Street, Baltimore, Maryland 21201.