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Improvement of recombinant-truncated Burkholderia motility protein A (BimA)-based indirect ELISA for equine glanders.

Glanders is a contagious and highly fatal disease of equines with zoonotic potential. It is caused by a Gram-negative, nonmotile bacterium Burkholderia mallei. Complement fixation test (CFT) is one of the most commonly used tests for diagnosis of glanders; however, it has some limitations. A recombinant-truncated Burkholderia intracellular motility A (BimA) protein-based indirect enzyme-linked immunosorbent assay (iELISA) was previously reported by us for glanders diagnosis, which has been re-optimized in this study using a panel of glanders positive (n = 75) and glanders negative (n = 227) serum samples. The improved iELISA exhibited 96% sensitivity and 90.75% specificity. The assay had 98.56% negative predictive value. In the improved iELISA, background for negative samples was reduced and a rational assay cut-off based on ROC curves was introduced. Intra laboratory repeatability of the iELISA was tested by 3 different operators with 100% correlation. The BimA-coated ELISA plates could be used without significant decrease in diagnostic efficacy even after their storage at room temperature or 37°C for 90 days. Overall, the improved iELISA is a sensitive, specific, reproducible, and easy-to-use assay that has potential in serodiagnosis of glanders, more suitably to demonstrate freedom from B. mallei infection in a population.

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