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Immunoagglutination test to diagnose Chagas disease: comparison of different latex-antigen complexes
Valeria S Garcia1, Verónica D G Gonzalez, Ivan S Marcipar
1INTEC (Universidad Nacional del Litoral and CONICET), Santa Fe, Argentina.
Insights
A new carboxylated latex-chimeric protein 2 (C2-CP2) complex effectively detects Trypanosoma cruzi antibodies. This diagnostic tool shows high sensitivity and specificity, making it valuable for sero-epidemiological studies.
Area of Science:
- Immunology
- Parasitology
- Diagnostic Development
Background:
- Chagas disease, caused by Trypanosoma cruzi, requires accurate serological diagnostic tools.
- Current diagnostic methods may face challenges with specificity due to cross-reactivity with other parasites like Leishmania.
Purpose of the Study:
- To evaluate the diagnostic performance of novel latex-protein complexes derived from Trypanosoma cruzi antigens.
- To assess the accuracy of these complexes in detecting T. cruzi antibodies in patient sera.
Main Methods:
- Development and comparative evaluation of latex-protein complexes using total parasite homogenate (TPH) and recombinant proteins (RP1, RP5, CP1, CP2).
- Immunoagglutination test utilized with T. cruzi-positive, leishmaniasis-positive, and negative sera.
- Diagnostic accuracy assessed using Area Under the Receiver Operating Characteristic Curve (ROC), sensitivity, and specificity.
Main Results:
- Chimeric recombinant proteins (CP1, CP2) demonstrated superior performance over simple recombinant proteins (RP1, RP5) and TPH.
- The carboxylated latex-CP2 (C2-CP2) complex exhibited high specificity, overcoming cross-reactivity issues seen with TPH.
- The C2-CP2 assay achieved an Area Under ROC curve of 0.96, with 92.3% sensitivity and 84.0% specificity, indicating suitability as a screening test.
Conclusions:
- The C2-CP2 latex-protein complex is a promising tool for diagnosing Trypanosoma cruzi infections.
- This novel assay holds potential for effective use in sero-epidemiological studies of Chagas disease.
Objective:
To evaluate the diagnostic performance of novel latex-protein complexes obtained from different antigens of Trypanosoma cruzi through immunoagglutination test using a panel of T. cruzi-positive sera, leishmaniasis-positive sera and negative sera for both parasites.
Methods:
Complexes' behaviour using total parasite homogenate (TPH), two simple recombinant proteins (RP1 and RP5) and two chimeric recombinant proteins (CP1 and CP2) was comparatively evaluated. The area under ROC curves was used as an index of accuracy. Sensitivity, specificity and discrimination efficiency were assessed.
Results:
All recombinant antigens showed higher specificity than TPH. The lower specificity of TPH was mainly due to cross-reacting peptides between T. cruzi and Leishmania spp. In turn, all performance indicators were higher for CP1 and CP2 than for RP1 and RP5. The carboxylated latex-CP2 (C2-CP2) complex was able to detect antibodies against T. cruzi. The values of area under ROC curve (0.96), sensitivity (92.3%, 95% CI: 79.4-100.0%) and specificity (84.0%, 95% CI: 67.6-100.0%) indicate that the assay could be used as a screening test.
Conclusion:
The C2-CP2 complex could be an important tool to carry out sero-epidemiological studies.
