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Porphyromonas bennonis sp. nov., isolated from human clinical specimens

¹ VA Wadsworth;
² The University of Oklahoma

³ E-mail: carlsonph{at}aol.com

During our investigation of the bacteriology of human wound infections and abscesses, a novel anaerobic, nonsporeforming, Gram-negative bacillus was frequently isolated. Based on morphological and biochemical criteria the strains were tentatively identified as Bacteroidaceae but they did not appear to correspond to any recognized species of this family. Comparative 16S rRNA gene sequencing showed that the 14 strains were genotypically homogeneous and confirmed their placement in the genus Porphyromonas. Sequence divergence values of >10% with reference Porphyromonas species demonstrated that the novel organism represents a novel species. Based on biochemical criteria and phylogenetic considerations, it is proposed that the unknown isolates from human sources be assigned to a new species of the genus Porphyromonas as Porphyromonas bennonis sp. nov. The type strain of P. bennonis is WAL 1926CT (=ATCC BAA-1629T =CCUG 55979T).