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The dental infections have been increased due to the widespread overuse and exposure to antibiotics. One of the well-known
pathogens is S. aureus The pathogenic properties of S. aureus is associated with the virulence gene. The objective of this study is
to investigate the distribution of virulence gene of S. aureus which may contribute to the prevention and treatment of bacterial
infections. 54 strains of S. aureus were separated from saliva taken from 129 outpatients diagnosed with periodontitis from Jun. to
Dec., 2010 in Seoul. 44 (46.6%) and 13 (31.7%) strains of them were obtained from 88 and 41 outpatients from the S and E dental
clinics, respectively. Then, the distribution of virulence gene and genetic diversity were analyzed with the PCR technique. The result
of the S. aureus isolates possessed coagulase gene and showed six polymorphism types 390~470 bp (1.8%), 550~633 bp (3.7%),
630~714 bp (9.3%), 715~795 bp (20.4%), 796~876 bp (40.7%) and 877~957 bp(22.2%) due to variable numbers of tandem repeats
present within the gene. In this study it will be anticipated that this study can contribute to establish efficiently the countermeasure
about the prevention and treatment of antibiotic bacterial infections.