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Journal of Clinical Microbiology, September 2003, p. 4058-4067, Vol. 41, No. 9
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.9.4058-4067.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Clonal Complexes of Campylobacter jejuni Identified by Multilocus Sequence Typing Correlate with Strain Associations Identified by Multilocus Enzyme Electrophoresis

Andrew D. Sails,* Bala Swaminathan, and Patricia I. Fields

Foodborne and Diarrheal Diseases Branch, Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia

Received 14 November 2002/ Returned for modification 10 January 2003/ Accepted 26 June 2003

Multilocus sequence typing (MLST) and pulsed-field gel electrophoresis (PFGE) with SmaI were used to subtype 55 isolates of Campylobacter jejuni from a diverse range of human and animal sources previously characterized by multilocus enzyme electrophoresis (MEE). MEE and MLST targeted 11 and 7 loci, respectively, and all loci were unique to each method. MEE, MLST, and PFGE identified 40, 37, and 48 discrete subtypes, respectively, with many of the subtypes occurring only once within the data set. Simpson's indices of diversity were calculated to be 0.979, 0.966, and 0.994 for MEE, MLST, and PFGE, respectively, demonstrating that MEE and MLST had similar discriminatory powers but that PFGE was more discriminatory. Allele diversity was higher in the MLST loci; individual single-locus diversities for the 11 MEE loci and the 7 MLST loci were 0.491 and 0.854, respectively. The clonal complexes recognized by MLST correlated with the strain associations previously recognized by MEE and contained some isolates indistinguishable by PFGE. Many clusters contained isolates from diverse geographical regions and from both humans and animals. These results demonstrate the usefulness of MLST for investigation of the global epidemiology of this important pathogen and illustrate its potential to identify indistinguishable strains or clones in geographically distinct regions.

* Corresponding author. Present address: Health Protection Agency, Newcastle Laboratory, Institute of Pathology, Newcastle General Hospital, Westgate Rd., Newcastle upon Tyne NE4 6BE, United Kingdom. Phone: 44 (0) 191 226 1074. Fax: 44 (0) 191 226 0365. E-mail: andrew.sails{at}hpa.org.uk.

Journal of Clinical Microbiology, September 2003, p. 4058-4067, Vol. 41, No. 9
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.9.4058-4067.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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