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Journal of Clinical Microbiology, January 2003, p. 330-336, Vol. 41, No. 1
0095-1137/03/$08.00+0 DOI: 10.1128/JCM.41.1.330-336.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.
Evaluation of 11 PCR Assays for Species-Level Identification of Campylobacter jejuni and Campylobacter coli
Stephen L. W. On* and Penelope J. Jordan
Danish Veterinary Institute, Copenhagen, Denmark
Received 27 March 2002/
Returned for modification 15 July 2002/
Accepted 22 October 2002
We examined the sensitivity and specificity of 11 PCR assays described for the species identification of Campylobacter jejuni and Campylobacter coli by using 111 type, reference, and field strains of C. jejuni, C. coli, and Campylobacter lari. For six assays, an additional 21 type strains representing related Campylobacter, Arcobacter, and Helicobacter species were also included. PCR tests were initially established in the laboratory by optimizing conditions with respect to five type and reference strains of C. jejuni, C. coli, and C. lari. One PCR test for C. coli failed to give appropriate results during this initial setup phase and was not evaluated further. The remaining 10 assays were used to examine heated lysate and purified DNA templates as appropriate of well-characterized type, reference, and field strains of C. jejuni (n = 62), C. coli (n = 34), and C. lari (n = 15). The tests varied considerably in their sensitivity and specificity for their respective target species. No assay was found to be 100% sensitive and/or specific for all C. jejuni strains tested, but four assays for C. coli gave appropriate responses for all strains examined. Between one and six strains of C. jejuni gave amplicons in four of seven C. jejuni PCR tests only where purified DNA was used as the template; corresponding results were seen with one strain of C. coli in each of three assays for the latter species. Our findings indicate that a polyphasic strategy for PCR-based identification should be used to identify C. jejuni and C. coli strains. The data may assist laboratories in selecting assays suited for their needs and in designing evaluations of future PCR tests aimed to identify these species.
* Corresponding author. Mailing address: Danish Veterinary Institute, Bülowsvej 27, DK-1790 Copenhagen V, Denmark. Phone: 45 35 30 02 59. Fax: 45 35 30 01 20. E-mail:
sto{at}vetinst.dk.
Journal of Clinical Microbiology, January 2003, p. 330-336, Vol. 41, No. 1
0095-1137/03/$08.00+0 DOI: 10.1128/JCM.41.1.330-336.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.
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