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Seven years of clinical experience with the Yeast Traffic Light PNA FISH: Assay performance and possible implications on antifungal therapy

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We evaluated the performance of Yeast Traffic Light PNA FISH (YTL PNA FISH) in identification of Candida spp. from blood cultures. A total of 200 new episodes of candidaemia were analysed prospectively. The YTL PNA FISH results were reported to the clinicians and data on antifungal therapy were documented. In total, there were 164/200 (82%) positive blood culture bottles with monomicrobial growth. Coverage of monomicrobial yeast was 150/164 (91.5%). YTL PNA FISH could identify 23/24 (95.8%) Candida spp. in bottles with concomitant growth of bacteria and one yeast. Growth of two or more different yeast was observed in 12/200 (6%) blood culture bottles and the method could identify all yeast in 8/12 (66.7%). Data on antifungal treatment were available for 181/200 patients (90.5%). In 132/137 (96.4%) samples from patients without antifungal treatment, YTL PNA FISH could identify the Candida spp. or gave a negative result for yeast not included in panel, and based on the result guide appropriate antifungal therapy the same day when the blood culture bottle signalled positive. This study shows that YTL PNA FISH is a rapid, reliable diagnostic method which significantly reduces time delay for choice of appropriate antifungal therapy for critically ill patients.
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Keywords: PNA‐FISH; blood culture; candidaemia; rapid identification

Document Type: Research Article

Publication date: March 1, 2018

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