We studied the occurrence of Capnocytophaga spp. and Haemophilus actinomycetemcomitans in periodontal pockets using selective medium. The subjects examined in this study consisted of 148 students (75 junior high school students and 73 high school students) . They were divided into four groups by clinical examination: simple gingivitis (SG) group, proliferative gingivitis (PG) group, adult periodontitis (AP) and juvenile periodontitis (JP) group and control group. Capnocytophaga ochracea could be isolated almost equally from both healthy and affected sites. However, the occurrence of Haemophilus actinomycetemcomitans varied significantly among the groups by Chi-square test. In the PG group and AP and JP group, no statistically significant age-and sex-differences were found in the microbe-positive rates.
It was concluded that Haemophilus actinomycetemcomitans occurred frequently at periodontal diseased sites in junior high school students and high school students.
