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J Med Microbiol 56 (2007), 1350-1355; DOI: 10.1099/jmm.0.47220-0
© 2007 Society for General Microbiology
ISSN 1473-5644

Multiplex PCR for direct identification of Campylobacter spp. in human and chicken stools

Aisha Al Amri1,{dagger}, Abiola C. Senok2,{dagger}, Abdulrahman Yusuf Ismaeel1, Ali E. Al-Mahmeed1 and Giuseppe A. Botta1,3

1 Department of Microbiology, Immunology and Infectious Diseases, College of Medicine and Medical Sciences, Arabian Gulf University, PO Box 22979, Manama, Kingdom of Bahrain

2 Department of Clinical Sciences, College of Medicine, University of Sharjah, United Arab Emirates

3 Department of Medical and Morphological Sciences, Institute of Microbiology, Udine Medical School, Udine, Italy

Abiola C. Senok
asenok{at}sharjah.ac.ae

Received 8 February 2007
Accepted 15 June 2007

Differentiation between Campylobacter jejuni and Campylobacter coli is problematic in clinical specimens due to fastidious growth requirements and limited biochemical tests. This study describes a rapid, multiplex PCR protocol for the direct detection and differentiation of C. jejuni and C. coli in stools. An evaluation was carried out of this multiplex protocol based on the detection of cadF (genus specific), and hipO (C. jejuni) and asp (C. coli) genes, using stool from patients with Campylobacter enteritis and chicken. Protocol sensitivity was assessed and specificity determined using a panel of enteric bacteria, and evaluation of 30 diarrhoeic stool specimens culture negative for Campylobacter. Of the 114 specimens (54 human and 60 chicken) evaluated by the protocol, 70 (61.4 %) were identified as C. jejuni, 35 (30.7 %) as C. coli and 9 (7.9 %) as a mixed infection/colonization with both species. All mixed infections were identified as C. jejuni by culture. Among the stool specimens that were culture negative for Campylobacter, two (6.7 %) were C. jejuni positive by multiplex PCR. The protocol sensitivity limit was 0.015–0.016 ng C. jejuni and C. coli DNA µl–1 in the specimen. There was no cross-reaction with the reference strains assessed. Comparison of hippurate test and multiplex PCR demonstrated 17 isolates with false-positive hippurate enzymic activity and 7 with false-negative activity. This rapid protocol (turnaround time 6 h) is highly sensitive and specific for direct evaluation of stool for these pathogens. It has significant application for routine clinical diagnostic and epidemiological purposes.

{dagger}These authors contributed equally to this work.




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