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J Med Microbiol 57 (2008), 95-99; DOI: 10.1099/jmm.0.47561-0
© 2008 Society for General Microbiology
ISSN 1473-5644

Occurrence of staphylococci in the oral cavities of healthy adults and nasal–oral trafficking of the bacteria

Y. Ohara-Nemoto1, H. Haraga2, S. Kimura2 and T. K. Nemoto1

1 Department of Oral Molecular Biology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8588, Japan

2 Department of Oral Microbiology, Iwate Medical University School of Dentistry, Morioka 020-8505, Japan

Correspondence
Y. Ohara-Nemoto
ynemoto{at}nagasaki-u.ac.jp

Received 6 August 2007
Accepted 25 September 2007

To investigate a possible peroral route of infective endocarditis (IE), the occurrence of staphylococci in the oral cavity was examined using saliva and supragingival plaque specimens from 56 systemically and periodontally healthy adults aged 22–43 years old (27.1±5.3). Nine Staphylococcus species and 334 isolates were identified. In saliva, the total occurrence rate was 83.9 % and the total number of bacteria was 102–104 c.f.u. ml–1. Staphylococcus aureus was the most frequent species (46.4 %), followed by Staphylococcus epidermidis (41.1 %) and others (Staphylococcus hominis, Staphylococcus warneri, Staphylococcus intermedius, Staphylococcus capitis, Staphylococcus haemolyticus, Staphylococcus lugdunensis and Staphylococcus gallinarum, isolation frequencies ranging in order from 12.5 to 1.8 %). A similar isolation tendency was observed in supragingival plaque, with a total occurrence rate of 73.2 % and amounts of bacteria ranging from 102 to 105 c.f.u. g–1. Four common Staphylococcus species (S. aureus, S. epidermidis, S. lugdunensis and S. hominis) were isolated from nasal swab samples taken from the oral staphylococci-positive subjects. Genotyping of all 18 combinations of oral- and nasal-derived isolates by PFGE indicated that identical clones or close relatives were commonly distributed in these two cavities. Since the provision of micro-organisms from the nasal cavity was shown and occurrence rates in the oral cavity were adequate, these results suggest a possible peroral route of staphylococcal IE, as in cases of viridans streptococcal IE.

Abbreviations: IE, infective endocarditis.




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