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Chagas' disease: an algorithm for donor screening and positive donor counseling
N Hamerschlak1, J Pasternak, V Amato Neto
1Serviço de Hemoterapia, Hospital Israelita Albert Einstein, São Paulo, Brasil.
Summary
Enzyme immuno-assay (ELISA) offers a superior method for screening Chagas disease in blood donors. This automated test provides high sensitivity and specificity, improving upon traditional subjective assays.
Area of Science:
- Medical diagnostics
- Immunology
- Parasitology
Background:
- Traditional serological assays for Chagas disease diagnosis are labor-intensive and prone to subjective interpretation.
- Accurate and efficient screening of blood donors is crucial for preventing Chagas disease transmission.
Purpose of the Study:
- To evaluate the performance of enzyme immuno-assay (ELISA) for Chagas disease screening in blood banks.
- To develop and propose an optimized algorithm for blood donor screening using ELISA.
Main Methods:
- Screened 7,999 blood donor samples using reverse passive hemagglutination (RPHA) and indirect immunofluorescence assay (IFA).
- Utilized supplementary RPHA, IFA, and complement fixation assays (CFA) for confirmatory testing.
- Evaluated ELISA kits from three manufacturers using a panel of 60 confirmed samples.
Main Results:
- All evaluated ELISA methods demonstrated 100% sensitivity for Chagas disease detection.
- ELISA exhibited superior specificity compared to traditional screening methods.
- The study confirmed ELISA's suitability for automated, objective blood donor screening.
Conclusions:
- Enzyme immuno-assay (ELISA) is the preferred method for Chagas disease blood donor screening due to its high sensitivity, specificity, and automation potential.
- A validated algorithm incorporating ELISA can enhance the safety and efficiency of blood banks.