1887

Abstract

The DiversiLab system, which uses repetitive sequence-based PCR (rep-PCR) to genotype micro-organisms, was evaluated as a molecular typing tool for members of the genus . Initially, 41 clinical spp. (7 , 10 , 7 , 10 and 7 ), previously identified at the species level by morphological and biochemical analysis, were analysed with the DiversiLab system. Species identification was confirmed by DNA sequence analysis of the contiguous internal transcribed spacer (ITS) region (ITS1–5.8S–ITS2). On the basis of an 80 % similarity threshold, rep-PCR consistently clustered like species and this set of isolates, along with five ATCC reference strains, was used to create a DNA fingerprint library with the DiversiLab software. Subsequently, an additional set of 115 clinical isolates, identified biochemically as (=94), (=8), (=5), (=3), (=3) and (=2), isolated at a regional reference laboratory, were typed using DiversiLab. One hundred and six of these isolates clustered with members of the library at >80 % similarity and thus could be assigned species identification, and initial calculations showed that identification via rep-PCR fingerprinting was 95 % concordant (101/106) with the biochemical/morphological identification. However, ITS region sequencing of the five discrepant samples, as well as the nine isolates that were <80 % similar to the database samples, showed that nine were misidentified with traditional biochemical/morphological methods. For the misidentified isolates, the sequence-based identification was in agreement with the DiversiLab clustering, yielding an actual correlation of >99 %. As traditional techniques can take several days to provide information about at the genus/species level, genotyping with the DiversiLab system holds promise for more-rapid speciation of members of this genus. This system may also be useful for epidemiological studies such as source tracking that require subspecies discrimination.

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2007-06-01
2024-11-14
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