Abstract
A multicenter evaluation was undertaken to evaluate the performance of a new three-color peptide nucleic acid fluorescence in situ hybridization assay that identifies isolates directly from blood cultures positive for Gram-negative bacilli (GNB). The assay correctly identified 100% (186/186) of the Escherichia coli isolates, 99.1% (109/110) of the Klebsiella pneumoniae isolates, and 95.8% (46/48) of the Pseudomonas aeruginosa isolates in this study. Negative assay results were correctly obtained for 162 of 165 other GNB (specificity, 98.2%).
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