Abstract
Species of the genus Bacteroides, Prevotella and Porphyromonas belong to indigenous microbiota of oropharinge, and gastrointestinal and genital tracts. Prevotella spp. and Porphyromonas spp. are often isolated from head, neck and lung infections. In oral cavity the subgingival biofilm represent the main site of colonization of the gram-positive and gram-negative anaerobic bacteria. Porphy…