Localized cutaneous leishmaniasis (chiclero's ulcer) in Mexico: sensitivity and specificity of ELISA for IgG antibodies to Leishmania mexicana mexicana.

Sera from 223 human beings were assayed by enzyme-linked immunosorbent assay for immunoglobulin G antibodies to Leishmania mexicana mexicana promastigotes. 76% of 74 sera from patients with chiclero's ulcer gave positive reactions at a titre of 1:40; the positivity rate was lower in patients with long-standing infections. False positive reactions were obtained with only 7% of 56 sera from healthy individuals with positive Montenegro tests and with 6 of 7 sera from patients with Chagas disease. It is concluded that this method would be a useful contributory diagnostic method in cases of suspected chiclero's ulcer.