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Journal of Clinical Microbiology, April 2005, p. 1732-1737, Vol. 43, No. 4
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.4.1732-1737.2005

Phenotypic and Genetic Characterization of Clinical Isolates of CDC Coryneform Group A-3: Proposal of a New Species of Cellulomonas, Cellulomonas denverensis sp. nov.

June M. Brown,* Rodrick P. Frazier, Roger E. Morey, Arnold G. Steigerwalt, Gerald J. Pellegrini, Maryam I. Daneshvar, Dannie G. Hollis, and Michael M. McNeil{dagger}

Meningitis and Special Pathogens Branch, Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Public Health Service, U.S. Dept. of Health and Human Services, Atlanta, Georgia 30333

Received 25 June 2004/ Returned for modification 3 September 2004/ Accepted 20 December 2004

CDC coryneform group A-3 bacteria are rare human pathogens. In this study, six group A-3 isolates (two from blood, one from cerebrospinal fluid, and one each from homograft valve, lip wound, and pilonidal cyst) were compared to the type strains of phenotypically related organisms, Cellulomonas fimi, Cellulomonas hominis, Oerskovia turbata, and Sanguibacter suarezii, and characterized by phenotypic, chemotaxonomic, and genotypic studies. DNA-DNA reassociation analysis identified two genomic groups, and phylogenetic analysis of the 16S rRNA gene sequence identified the taxonomic positions of these groups to genus level. Two groups were defined, and both were more closely related to Cellulomonas species: one group of three strains, for which we propose the new species Cellulomonas denverensis sp. nov., with the type strain W6929 (ATCC BAA-788T or DSM 15764T), was related to C. hominis ATCC 51964T (98.5% 16S rRNA gene sequence similarity), and the second group of three strains was related to C. hominis ATCC 51964T (99.8 to 99.9% 16S rRNA gene sequence similarity). The definition of this new Cellulomonas species and the confirmation of three strains as C. hominis serve to further clarify the complex taxonomy of CDC coryneform group A-3 bacteria and will assist in our understanding of the epidemiology and clinical significance of these microorganisms.

* Corresponding author. Mailing address: Centers for Disease Control and Prevention, Bldg. 17-2207, Mailstop G-34, Atlanta, GA 30333. Phone: (404) 639-3491. Fax: (404) 639-3022. E-mail:jmb6{at}cdc.gov.

{dagger} Present address: Division of Epidemiology and Surveillance, National Immunization Program, Centers for Disease Control and Prevention, Atlanta, GA 30333.

Journal of Clinical Microbiology, April 2005, p. 1732-1737, Vol. 43, No. 4
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.4.1732-1737.2005




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