PCR-Dipstick Chromatography for Differential Detection of Carbapenemase Genes Directly in Stool Specimens
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ABSTRACT A PCR-dipstick chromatography technique was designed and evaluated for differential identification of bla NDM, bla KPC, bla IMP, and bla OXA-48 carbapenemase genes directly in stool specimens within 2 h. It is a DNA-DNA hybridization-based detection system where PCR products can be easily interpreted by visual observation without electrophoresis. The PCR-dipstick showed high sensitivity (93.3%) and specificity (99.1%) in directly detecting carbapenemase genes in stool specimens compared with multiplex PCR for genomic DNA of the isolates from those stool specimens.