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Journal of Clinical Microbiology, September 2005, p. 4455-4459, Vol. 43, No. 9
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.9.4455-4459.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Porphyromonas somerae sp. nov., a Pathogen Isolated from Humans and Distinct from Porphyromonas levii

Paula H. Summanen,1* Bengül Durmaz,2 Marja-Liisa Väisänen,3 Chengxu Liu,1 Denise Molitoris,1 Erkki Eerola,4 Ilkka M. Helander,8 and Sydney M. Finegold5,6,7

Research Service,1 Infectious Diseases Section, Veterans Affair Medical Center West Los Angeles, Los Angeles, California,5 Inönü University, Faculty of Medicine, Department of Microbiology, Malatya, Turkey,2 Department of Bacteriology Anaerobe Reference Laboratory, National Public Health Institute (KTL), Helsinki, Finland,3 Department of Medical Microbiology, Turku University, Turku, Finland,4 Department of Medicine,6 Department of Microbiology, Immunology and Molecular Genetics, University of California at Los Angeles School of Medicine, Los Angeles, California,7 Department of Applied Chemistry and Microbiology, Division of Microbiology, University of Helsinki, Helsinki, Finland8

Received 22 March 2005/ Returned for modification 4 May 2005/ Accepted 26 May 2005

Porphyromonas levii is an anaerobic, pigmented gram-negative bacillus originally isolated from bovine rumen. We describe 58 human clinical strains of P. levii-like organisms, isolated from various human clinical specimens that are phenotypically similar to the type strain of P. levii, a rumen isolate (ATCC 29147). Our biochemical, comparative 16S rRNA sequence analyses, and DNA-DNA relatedness studies indicate that the human P. levii-like organisms are similar to each other but genetically different from the P. levii type strain isolated from bovine rumen. We therefore propose the name Porphyromonas somerae to encompass the human P. levii-like organisms. P. somerae was predominantly isolated from patients with chronic skin and soft tissue or bone infections, especially in the lower extremities.

* Corresponding author. Mailing address: VA Wadsworth Medical Center, Anaerobe Laboratory Building 304, Room E3-237, 11301 Wilshire Boulevard, Los Angeles, CA 90073. Phone: (310) 478-3711, ext. 49157. Fax: (310) 268-4458. E-mail: carlsonph{at}aol.com.

Journal of Clinical Microbiology, September 2005, p. 4455-4459, Vol. 43, No. 9
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.9.4455-4459.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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