1887

Abstract

Two commercial real-time PCR assays for the detection of , BD GeneOhm Cdiff assay (BD Diagnostics) and Xpert assay (Cepheid), were compared to each other and to toxigenic culture, which was used as a gold standard, on a set of 194 clinical stools submitted for routine diagnostic analysis. Of 28 (14.4 %) toxigenic culture positive samples 23 were positive with both assays, the BD and the Cepheid real-time PCR assays, 4 were positive only by Cepheid Xpert assay and 1 sample was negative by both PCR assays, resulting in sensitivity, specificity, positive predictive value and negative predictive value of 82.1, 98.2, 88.5 and 97.0 %, respectively, for the BD GeneOhm Cdiff assay, and 96.4, 97.3, 87.1 and 99.3 %, respectively, for the Cepheid Xpert assay. Altogether 26 out of 194 (13.4 %) samples were reported invalid by Cepheid. Toxigenic positive samples contained 15 different PCR ribotypes distributed into toxinotype 0 and 2 different variant toxinotypes (III, IV). Clinical data were available for 24 out of 28 (85.7  %) toxigenic positive patients and 18 (75.0 %) of them were diagnosed with diarrhoea, while others had other symptoms or risk factors related to possible infection (antibiotics, bloody stool, peritonitis, Crohn’s disease).

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2011-08-01
2021-01-23
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