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Ornithobacterium rhinotracheale gen. nov., sp. nov., Isolated from the Avian Respiratory Tract

¹ Laboratorium voor Microbiologie, Faculteit Wetenschappen, University of Ghent, B-9000 Ghent, Belgium
⁶ Laboratorium voor Bacteriologie, Faculteit Diergeneeskunde, University of Ghent, B-9000 Ghent, Belgium
² Klinikum der Philipps-Universität Marburg, Marburg, Germany
³ Provinciaal Verbond voor Dierenziektenbestrijding, Torhout, Belgium
⁴ Department of Molecular Genetics, Forsyth Dental Center, Boston, Massachusetts 02115
⁵ Culture Collection, Department of Clinical Bacteriology, University of GÖteborg, S-413 46 GÖteborg, Sweden
⁷ Royal Veterinary and Agricultural University and National Veterinary Laboratory, Frederiksberg, Denmark
⁸ Klinik für Geflügel der Tierärztlichen Hochschule, Hannover, Germany

^* Corresponding author. Mailing address: Laboratorium voor Microbiologie, Universiteit Gent, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium. Phone: 32-9-2645114. Fax: 32-9-2645346.

ABSTRACT

The phylogenetic position and various genotypic, chemotaxonomic, and classical phenotypic characteristics of 21 gram-negative avian isolates were studied. These strains constitute a genotypically homogeneous taxon in rRNA superfamily V, as shown by DNA-rRNA hybridization data. Determination of the 16S rRNA sequence of this taxon revealed its detailed position within the "flavobacter" subgroup of the "flavobacter-bacteroides" phylum as described by Gherna and Woese (R. Gherna and C. R. Woese, Syst. Appl. Microbiol. 15:513-521, 1992). This new taxon is only distantly related to other members of the "flavobacter-bacteroides" phylum and is therefore given separate generic status. The DNA-DNA binding values for members of this taxon, for which we propose the name Ornithobacterium rhinotracheale, confirmed that all of the strains are highly interrelated (DNA-DNA binding values greater than 90% were measured). The G+C contents of members of this taxon are between 37 and 39 mol%. An analysis of the cellular proteins and fatty acids and classical phenotypic characteristics allowed us to distinguish O. rhinotracheale from phenotypically similar taxa, such as Riemerella anatipestifer and Capnocytophaga species. The respiratory quinone content (menaquinone 7) and carbohydrate pattern of O. rhinotracheale conform with the respiratory quinone contents and carbohydrate patterns of other members of rRNA superfamily V.

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