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Streptococci Dominate the Diverse Flora within Buccal Cells

Department of Diagnostic and Biological Sciences, School of Dentistry, University of Minnesota, 17-252 Moos Tower, 515 Delaware St. SE, Minneapolis, MN 55455, USA;

^* corresponding author, jrudney{at}tc.umn.edu

Previously, we reported that intracellular Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis, and Tannerella forsythensis were present within buccal epithelial cells from human subjects, as lesser components of a polymicrobial flora. In this study, we further characterized that intracellular flora by using the same double-labeling techniques to identify Fusobacterium nucleatum, Prevotella intermedia, oral Campylobacter species, Eikenella corrodens, Treponema denticola, Gemella haemolysans, Granulicatella adiacens, and total streptococci within buccal epithelial cells. All those species were found within buccal cells. In every case, species recognized by green-labeled species-specific probes were accompanied by other bacteria recognized only by a red-labeled universal probe. Streptococci appeared to be a major component of the polymicrobial intracellular flora, being present at a level from one to two logs greater than the next most common species (G. adiacens). This is similar to what is observed in oral biofilms, where diverse species interact in complex communities that often are dominated by streptococci.

KEY WORDS: Streptococcus • Fusobacterium nucleatum • Prevotella intermedia • Campylobacter • Eikenella corrodens • Treponema denticola • Gemella haemolysans • Granulicatella adiacens • buccal cells • bacterial invasion

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