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Journal of Clinical Microbiology, September 2000, p. 3399-3403, Vol. 38, No. 9
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Characterization of Actinomyces Isolates from Infected Root Canals of Teeth: Description of Actinomyces radicidentis sp. nov.

Matthew D. Collins,1 Lesley Hoyles,1 Sotos Kalfas,2 Goran Sundquist,3 Tor Monsen,4 Natalia Nikolaitchouk,5,6 and Enevold Falsen5

Department of Food Science and Technology, University of Reading, Reading RG6 6AP, United Kingdom1; Division of Oral Microbiology, Department of Odontology,2 Division of Endodontics, Department of Odontology,3 and Department of Clinical Bacteriology,4 Umea University, 90185 Umea, Sweden; Culture Collection, Department of Clinical Bacteriology, University of Göteborg, S-413 46 Göteborg, Sweden5; and Department of Microbiology, Russian Peoples Friendship University, Moscow, Russia6

Received 16 February 2000/Returned for modification 22 April 2000/Accepted 3 June 2000

Two strains of a previously undescribed Actinomyces-like bacterium were recovered in pure culture from infected root canals of teeth. Analysis by biochemical testing and polyacrylamide gel electrophoresis of whole-cell proteins indicated that the strains closely resembled each other phenotypically but were distinct from previously described Actinomyces and Arcanobacterium species. Comparative 16S rRNA gene-sequencing studies showed the bacterium to be a hitherto unknown subline within a group of Actinomyces species which includes Actinomyces bovis, the type species of the genus. Based on phylogenetic and phenotypic evidence, we propose that the unknown bacterium isolated from human clinical specimens be classified as Actinomyces radicidentis sp. nov. The type strain of Actinomyces radicidentis is CCUG 36733.

Journal of Clinical Microbiology, September 2000, p. 3399-3403, Vol. 38, No. 9
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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