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Department of Microbiology, Dental Institute, Floor 28, Guy's Tower, Guy's Hospital, King's College London, London SE1 9RT, UK
Correspondence
W. G. Wade
william.wade{at}kcl.ac.uk
Six strains of anaerobic, Gram-negative coccobacilli isolated from the root canals of patients with endodontic infections (five strains) and from a deep periodontal pocket (one strain) were subjected to a comprehensive range of phenotypic and genetic tests and were found to comprise a homogeneous group. Following 16S rRNA gene sequence analysis, they were found to be most closely related to Dialister pneumosintes, with 93 % sequence similarity between the two taxa. A novel species, Dialister invisus sp. nov., is proposed. Biochemically, the species is largely unreactive and is asaccharolytic, with only traces of acetate and propionate detected as metabolic end-products. The G+C content of the DNA of D. invisus strains is 45–46 mol%. The type strain is E7.25T (=CCUG 47026T=DSM 15470T).
Published online ahead of print on 4 July 2003 as DOI 10.1099/ijs.0.02640-0.
The GenBank accession number for the 16S rRNA gene sequence of Dialister invisus E7.25T is AY162469.
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