1887

Abstract

A multiplex-PCR method, specifically designed for application in routine diagnostic laboratories, was developed for the detection of and . Primers were directed towards the following loci: the hippuricase gene () characteristic of , a sequence partly covering an aspartokinase gene characteristic of , and a universal 16S rDNA gene sequence serving as an internal positive control for the PCR. The method was tested on 47 strains and 88 strains, and found to be almost 100 % in concordance with biochemical analyses (all except for one strain), regardless of whether the DNA was prepared from colonies by a simple boiling procedure or by DNeasy Tissue Kit. Pure cultures of and were identified at 10–100 cells per PCR. When the multiplex-PCR method was used on spiked human stool samples, both strains were identified at 10 cells per ml stool. This sensitivity limit was the same whether the DNA was purified by the method of KingFisher mL or QIAamp DNA Stool Kit. When the same spiked stools were grown on modified charcoal cefoperazone deoxycholate agar (mCCDA) plates before PCR, the sensitivity was 100 cells per ml stool, indicating that culturing of campylobacters on mCCDA plates is superior to direct DNA extraction at least when fresh stool samples are analysed by PCR.

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2005-11-01
2019-10-23
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