OCA2 and chronic periodontitis: Finally, this study also analyzed the relationship between P. gingivalisFimA genotypes and their association to other bacteria like Tannerella forsythia and Aggregatibacter actinomycetemcomitans; so that of 30 healthy patients positive for P. gingivalis, six were positive for T. forsythia and one for A. actinomycetemcomitans, while of 94 patients with chronic periodontitis positive for P. gingivalis, 60 were positive for T. forsythia and 34 for A. actinomycetemcomitans.