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Journal of Clinical Microbiology, May 2005, p. 2141-2147, Vol. 43, No. 5
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.5.2141-2147.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Repetitive-Sequence-PCR-Based DNA Fingerprinting Using the DiversiLab System for Identification of Commonly Encountered Dermatophytes

ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, Utah,¹ ARUP Infectious Diseases Laboratory, Salt Lake City, Utah,² Spectral Genomics, Inc., Houston, Texas,³ Department of Pathology, University of Utah Medical School, Salt Lake City, Utah⁴

Received 1 December 2004/ Returned for modification 28 December 2004/ Accepted 19 January 2005

The performance of repetitive-sequence-based PCR (rep-PCR) using the DiversiLab system for identification of dermatophytes commonly isolated in a clinical laboratory was assessed by comparing results to those of conventional tests (colony morphology, microscopic examination of slide cultures, and, for suspected Trichophyton species, use of additional media). Sixty-one cultures were tested in phase 1, the feasibility portion of the study; 64 additional cultures were tested in phase 2, the validation portion conducted to assess reproducibility and confirm accuracy. Discrepancies were resolved by repeating rep-PCR and conventional tests and, in phase 2, sequencing the internal transcribed spacers. After initial testing of the cultures in phase 1 (excluding one contaminated culture), agreement between conventional tests and rep-PCR was 90% (54 of 60). Agreement was 98.3% after resolution of discrepancies, and in all but one case the initial rep-PCR result was correct. After initial testing of cultures in phase 2 (excluding one discarded and one contaminated culture), agreement between rep-PCR and conventional testing was 88.7% (55 of 62). After discrepancies were resolved, agreement was 100%. Initial rep-PCR results were correct, except for one Microsporum canis culture containing two colony variants, which could not be initially identified by rep-PCR. The performance of the DiversiLab system for identification of the dermatophytes commonly encountered in a clinical mycology laboratory—Trichophyton mentagrophytes, Trichophyton rubrum, Trichophyton tonsurans, and M. canis—was excellent. Moreover, the DiversiLab system is technically simple and provides results in <24 h once a pure culture is available for testing, which is considerably more rapid than conventional identification tests.

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