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To assess the diagnostic and operational performance of the InBiOS AMD rapid diagnostic test (RDT) (Seattle, USA) for the detection of B. pseudomallei in grown blood culture broth. The InBiOS RDT is a lateral flow immunoassay in a strip format detecting B. pseudomallei capsular polysaccharide in culture fluids, marketed for research only. Broth of blood culture bottles (BacT/Alert, bioMérieux, Marcy L'Etoile, France) sampled in adult patients at the Sihanouk Hospital Center of HOPE, Phnom Penh, Cambodia, during 2010-2017 and stored at - 80 °C was tested. They included samples grown with B. pseudomallei (n = 114), samples with no growth (n = 12), and samples with growth of other pathogens (n = 139, among which Burkholderia cepacia (n = 5)). Diagnostic sensitivity and specificity were 96.5% [95% confidence interval (CI): 91.3-98.6%] and 100% [CI: 97.5-100%] respectively. Background clearance and line intensities were good and very good. The RDT's test strip, not housed in a cassette, caused difficulties in manipulation and biosafety. The centrifugation step prescribed by the procedure challenged biosafety, but processing of 19 B. pseudomallei samples without centrifugation showed similar results for line intensity and background clearance, compared to centrifugation. The InBiOS RDT showed excellent accuracy for detection of B. pseudomallei in grown blood culture broth. Provided operational adaptations such as cassette housing, it has the potential to reduce time to diagnosis of melioidosis.

Diagnostic accuracy of the InBiOS AMD rapid diagnostic test for the detection of Burkholderia pseudomallei antigen in grown blood culture broth