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Cutaneous leishmaniasis serodiagnosis by immunoperoxidase assay
1Department of Microbiology and Immunology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel.
Insights
This study assessed anti-leishmanial IgG antibodies using immunoperoxidase assay. Results show distinct antibody profiles for cutaneous leishmaniasis (CL) and visceral leishmaniasis (VL), aiding in disease differentiation.
Area of Science:
- Immunology
- Parasitology
- Medical Diagnostics
Background:
- Leishmaniasis presents as cutaneous (CL) and visceral (VL) forms, caused by Leishmania parasites.
- Accurate serological diagnosis is crucial for differentiating CL and VL and for epidemiological studies.
Purpose of the Study:
- To evaluate the efficacy of the immunoperoxidase assay (IPA) for detecting serum-specific anti-leishmanial IgG antibodies.
- To differentiate between CL and VL patients based on antibody responses to different Leishmania species.
- To compare IPA with other serological methods like immunofluorescent assay (IFA) and radioimmunoassay (RIA).
Main Methods:
- Serum samples from 65 CL patients, 5 VL patients, and 84 controls were analyzed using IPA.
- Intact promastigotes of Leishmania major, L. donovani, and L. aethiopica were used as antigens.
- IPA results were correlated with IFA and RIA findings.
Main Results:
- IPA demonstrated significant differences in anti-leishmanial IgG antibody levels between leishmaniasis patients (CL and VL) and controls.
- CL patients exhibited comparable antibody activity against L. major and L. donovani antigens.
- VL patients showed significantly higher antibody titers against the homologous L. donovani antigen compared to CL patients.
- IPA showed high and significant correlation with IFA and RIA.
- No cross-reactivity was observed with sera from malaria patients.
Conclusions:
- Immunoperoxidase assay is a reliable method for detecting anti-leishmanial IgG antibodies.
- The assay can help differentiate between cutaneous and visceral leishmaniasis based on distinct antibody profiles.
- IPA offers a valuable diagnostic tool for leishmaniasis, with good correlation to established methods and no cross-reactivity with malaria.
Abstract:
Immunoperoxidase assay was used for the determination of serum-specific anti-leishmanial IgG antibodies in 65 patients with cutaneous leishmaniasis (CL), in 5 with visceral leishmaniasis (VL) and in 84 controls. A significant difference was observed between CL and VL sera and the control sera when either Leishmania major, L. donovani or L. aethiopica intact promastigotes were used as antigens. CL patients showed similar activity against L. major and L. donovani antigen (titers 4-64 and less than 2-64 respectively), whereas VL patients showed a higher activity with the homologous antigen L. donovani (titers 128-2,048). A high and significant correlation was demonstrated between immunoperoxidase assay, immunofluorescent assay and radioimmunoassay. No cross-reactivity was found with sera from malaria patients.