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Journal of Clinical Microbiology, July 2003, p. 2980-2986, Vol. 41, No. 7
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.7.2980-2986.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Evaluation of Culture Methods and a DNA Probe-Based PCR Assay for Detection of Campylobacter Species in Clinical Specimens of Feces

Majella Maher,1* Cathriona Finnegan,2 Evelyn Collins,1 Brid Ward,1 Cyril Carroll,3 and Martin Cormican4

The National Diagnostics Centre, BioResearch,1 Department of Microbiology,3 Department of Bacteriology, National University of Ireland,4 Department of Medical Microbiology, University College Hospital, Galway, Ireland2

Received 4 November 2002/ Returned for modification 2 February 2003/ Accepted 4 April 2003

Campylobacter species are the leading agents of bacterial gastroenteritis in developed countries. In this study 320 specimens of feces from patients with symptoms of acute gastroenteritis were cultured for Campylobacter species by direct plating on modified charcoal cefoperazone deoxycholate agar and by enrichment in modified Preston broth, with or without blood added, for 48 h at 37°C prior to plating. A 16S/23S PCR/DNA probe membrane-based colorimetric detection assay was evaluated on a subset of the feces (n = 127), including 18 culture-positive and 109 culture-negative specimens. DNA was extracted directly from the fecal specimens by using the QIAamp DNA stool Minikit for the DNA probe-based PCR assay (PCR/DNA probe assay). A second PCR/DNA probe assay based on the 16S rRNA gene in Campylobacter spp. was applied to all specimens that were culture negative, PCR/DNA positive on initial analysis. Campylobacter species were cultured in 20 of the 320 specimens. The 16S/23S PCR/DNA probe assay detected campylobacter DNA in 17 of 18 (94% sensitivity) culture-positive specimens and in 41 (38%) culture-negative specimens. The presence of campylobacter DNA in 35 of 41 culture-negative specimens was confirmed by the 16S PCR/DNA probe assay. DNA sequence analysis of seven 16S/23S PCR products and five 16S PCR products amplified from a selection of these specimens confirmed the presence of campylobacter DNA and more specifically Campylobacter jejuni, C. concisus, C. curvus, and C. gracilis DNA in these specimens. The molecular assays described in this study are rapid methods for the detection and identification of Campylobacter species in fecal specimens. The finding of Campylobacter spp. DNA in a large number of specimens of feces from patients with no other identified cause of diarrhea may suggest that Campylobacter spp. other than C. jejuni and C. coli may account for a proportion of cases of acute gastroenteritis in which no etiological agent is currently identified.

* Corresponding author. Mailing address: DNA Diagnostics Laboratory, The National Diagnostics Centre, National University of Ireland, Galway. Phone: 353-91586559. Fax: 353-91586570. E-mail: Majella.Maher{at}nuigalway.ie.

Journal of Clinical Microbiology, July 2003, p. 2980-2986, Vol. 41, No. 7
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.7.2980-2986.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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