title: Western blot analysis of antibodies to Leishmania infantum antigens: potential of the 14-kD and 16-kD antigens for diagnosis and epidemiologic purposes.
abstract: When infected with Leishmania species, patients develop specific antibodies that constitute the basis of serodiagnosis. Using Western blot analysis, we studied the specificity of anti-L. infantum antibodies in patients with visceral leishmaniasis (including patients with acquired immunodeficiency syndrome [AIDS]) and in healthy subjects living in an endemic area. Sera from patients with visceral leishmaniasis recognized numerous antigens that had a molecular mass range of 12-120 kD. The 14-, 16-, 28-30-, 46-, and 68-kD antigens were recognized by 92%, 95%, 63%, 80%, 69%, and 89% of the patients' sera, respectively. The 14-16-kD antigens had the greatest specificity for leishmaniasis. The same pattern was found with sera from AIDS patients with proven leishmaniasis, but the 14-kD band was not present in some cases; recognition of the 16-kD band was constant. In these patients, Western blotting characterized specific antibodies even when the results of classic serologic tests (indirect immunofluorescent antibody test and enzyme-linked immunosorbent assay) were negative. Western blotting was found to be more sensitive than the IFA and ELISA, and it was used to detect antibodies to the 14-, 16-, 22-, and 24-kD antigens in subjects living in an endemic area. The detection of antibodies for the 14-kD and 16-kD Leishmania antigens would be a valuable tool both in the diagnosis of visceral leishmaniasis and in epidemiologic studies.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000150:complications*; D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood*; D000918:Antibody Specificity; D000953:Antigens, Protozoan / Q000276:immunology; D015153:Blotting, Western; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000276:immunology; D005455:Fluorescent Antibody Technique; D006801:Humans; D007893:Leishmania donovani / Q000276:immunology*; D007898:Leishmaniasis, Visceral / Q000150:complications / Q000175:diagnosis* / Q000276:immunology; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity
chemical_list: D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan; D000939:Epitopes