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Journal of Clinical Microbiology, May 2005, p. 2370-2374, Vol. 43, No. 5
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.5.2370-2374.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Characterization of Oral Strains of Cardiobacterium valvarum and Emended Description of the Organism

Xiang Y. Han1* and Enevold Falsen2

Section of Clinical Microbiology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030,1 Culture Collection of University of Goteborg, Goteborg, Sweden2

Received 10 September 2004/ Returned for modification 23 November 2004/ Accepted 29 December 2004

The description of the new species Cardiobacterium valvarum prompted a search for additional strains of the organism. Here we report characterization of four oral Cardiobacterium strains from the Culture Collection of the University of Goteborg. The 16S rRNA gene sequences of the organisms exhibited 99.6% to 99.3% homology with Cardiobacterium valvarum. The cellular fatty acid profiles, electrophoretic patterns of whole-cell proteins, growth rate and nutritional requirement, colonial and cellular morphology, and biochemical reactions were also similar to those of C. valvarum. These results thus classify these organisms as oral strains of C. valvarum. All strains were susceptible to many antibiotics tested. The description of the species was emended. C. valvarum is a rare cause of endocarditis, and its relationship with periodontal diseases may need investigation.

* Corresponding author. Mailing address: Section of Clinical Microbiology, The University of Texas M. D. Anderson Cancer Center, Unit 84, 1515 Holcombe Blvd., Houston, TX 77030. Phone: (713) 792-3515. Fax: (713) 792-0936. E-mail: xhan{at}mdanderson.org.

Journal of Clinical Microbiology, May 2005, p. 2370-2374, Vol. 43, No. 5
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.5.2370-2374.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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