Validation of a Commercial Glanders ELISA as an Alternative to the CFT in International Trade of Equidae.
Authors: Elschner Mandy Carolina, Melzer Falk, Singha Harisankar, Muhammad Saqib, Gardner Ian, Neubauer Heinrich
Journal: Frontiers in veterinary science
Summary
# Validation of Commercial Glanders ELISA as Trade Testing Alternative Glanders remains a notifiable zoonotic concern in equine populations, and international movement restrictions hinge on negative serological certification—historically requiring the complement fixation test (CFT), which suffers from poor standardisation and problematic specificity leading to costly false positives. Elschner and colleagues evaluated a newer commercial ELISA (ID Screen Glanders Double Antigen Multispecies) against the CFT gold standard using 400 negative and 370 positive field samples from equidae, comparing both analytical performance metrics and practical utility for trade certification. The GLANDA-ELISA demonstrated superior specificity at 99.8% versus the CFT's 97.0%, whilst maintaining comparable sensitivity (98.1% versus 96.5%), effectively eliminating many of the spurious positive results that have previously restricted legitimate equine trade. Given these performance characteristics, the ELISA offers a more standardised, reproducible alternative for serological glanders testing that could substantially reduce unnecessary trade barriers and economic losses from false-positive reactions. For equine professionals involved in international movement or trade documentation, this validation supports advocacy for regulatory acceptance of the GLANDA-ELISA as a replacement confirmatory test, potentially streamlining health certification processes without compromising disease detection capability.
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Practical Takeaways
- •If this ELISA becomes approved for trade certification, it would reduce false-positive test results that currently restrict horse movement and cause financial losses to owners
- •The superior specificity means fewer healthy horses would be incorrectly identified as positive and held from sale or export
- •Adoption of this test could streamline international equine trade while maintaining equivalent or better disease detection accuracy
Key Findings
- •GLANDA-ELISA demonstrated 99.8% specificity compared to CFT's 97.0% specificity in detecting glanders antibodies
- •GLANDA-ELISA sensitivity was 98.1% versus CFT sensitivity of 96.5% across 770 field samples
- •GLANDA-ELISA significantly reduces false-positive reactions that cause trade restrictions compared to the current mandatory CFT
- •GLANDA-ELISA is suitable as a confirmatory test and realistic alternative to CFT for international equine trade certification