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Journal of Clinical Microbiology, March 2002, p. 821-825, Vol. 40, No. 3
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.3.821-825.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Association of Bacteroides forsythus and a Novel Bacteroides Phylotype with Periodontitis

Eugene J. Leys,1 Sharon R. Lyons,1 Melvin L. Moeschberger,2 Robert W. Rumpf,1 and Ann L. Griffen3*

Department of Oral Biology,1 Department of Pediatric Dentistry, College of Dentistry,3 Division of Epidemiology and Biometrics, School of Public Health, College of Medicine and Public Health, The Ohio State University, Columbus, Ohio2

Received 6 August 2001/ Returned for modification 18 October 2001/ Accepted 27 November 2001

Chronic periodontitis is a common infectious disease in the adult population. The etiology is clearly bacterial, and a small number of bacterial species have been consistently associated with periodontitis, including Bacteroides forsythus and Porphyromonas gingivalis. Comparatively little attention has been paid to the identification of health-associated and potentially beneficial bacterial species that may reside in the gingival sulcus. The purpose of the present study was to examine the relationship of the presence of B. forsythus and a newly identified Bacteroides phylotype, oral clone BU063, to periodontal health status. The study was accomplished with a set of samples that were collected from subjects with periodontitis and healthy controls. These samples had previously been analyzed for the presence of P. gingivalis. An oral sampling strategy that included every tooth and a PCR-based detection method were used to maximize detection sensitivity. The presence of B. forsythus in the oral cavity was strongly associated with periodontitis, and its nearest genetic neighbor, oral clone BU063, was associated with oral health (P < 0.0001 for both). Colonization with P. gingivalis was independent of the presence of either Bacteroides species, but the two Bacteroides species were found together less often than would be expected by chance (P < 0.0001). This suggests the presence of a specific exclusionary mechanism between the two Bacteroides species. Comparisons between these two organisms may prove useful for studies that determine how B. forsythus functions in the disease process. In addition, oral clone BU063 deserves further study as a possible preventive or therapeutic intervention for periodontitis.

* Corresponding author. Mailing address: The Ohio State University, 305 W 12th Ave., P.O. Box 182357, Columbus, OH 43218-2357. Phone: (614) 292-1150. Fax: (614) 292-1125. E-mail: griffen.1{at}osu.edu.

Journal of Clinical Microbiology, March 2002, p. 821-825, Vol. 40, No. 3
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.3.821-825.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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