Rapid identification of Candida species in oral rinse solutions by PCR.

Abstract:

AIMS:To determine the sensitivity and specificity of a multiplex PCR assay for the contemporary identification of major species involved in oral candidiasis, without extraction and purification of DNA from the samples under investigation; and evaluation of this method in comparison with routine phenotypic culture identification. METHODS:78 oral rinse solutions were collected. The concentrated oral rinse technique was used for a quantitative and qualitative study. Research and identification of Candida spp, with routine phenotypic culture identification (germ-tube test in serum at 37 degrees C for 3 hours and sugar assimilation strip analysis), were performed. Each sample was analysed with multiplex PCR directly on oral rinse solution. Samples giving discrepant results between routine phenotypic and PCR identification methods were resubcultured on CHROMagar Candida plates. The fungus-specific primers ITS1, ITS2, CA3, and CA4 were used. For the identification of other species (C kefyr, C famata and C dubliniensis), ITS1F, ITS1K, and ITS2D primers were designed. RESULTS:Multiplex PCR correctly identified all samples, including those with single species, or with mixed species, negative samples and positive samples which appeared to be negative from routine phenotypic methods. CONCLUSION:This multiplex PCR assay provides a rapid alternative to the conventional culture based technique for the identification and speciation of the most frequently isolated Candida species. The absence of an extraction method made identification of 10 species possible in a few hours.

journal_name

J Clin Pathol

authors

Liguori G,Lucariello A,Colella G,De Luca A,Marinelli P

doi

10.1136/jcp.2006.040782

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

1035-9

issue

9

eissn

0021-9746

issn

1472-4146

pii

60/9/1035

journal_volume

60

pub_type

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