Table 1.

Bacterial clusters described by Socransky et al. (1998)

Complex	Bacterial cluster
Red	Treponema denticola, Porphyromonas gingivalis, Tannerella forsythensis
Orange	Fusobacterium nucleatum, Prevotella intermedia, Prevotella nigrescens, Peptostreptococcus micros (Associated species included) Eubacterium nodatum, Campylobacter rectus, Campylobacter showae, Streptococcus constellatus, Campylobacter gracilis)
Yellow	Streptococcus sanguis, Streptococcus oralis, Streptococcus mitis, Streptococcus gordonii, Streptococcus intermedius
Green	Carpnocytophaga, Camplobacter concisus, Eikenella corrodens, Actinobacillus actinomycemcomitans (serotype a)
Purple	Veillonella parvula, Actinomyces odontolyticus, Actinobacillus actinomycemcomitans (serotype b), Selenomonus noxia, Actinomyces naesludii