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Pelistega europaea gen. nov., sp. nov., a bacterium associated with respiratory disease in pigeons: taxonomic structure and phylogenetic allocation

¹Laboratorium voor Microbiologie, Ledeganckstraat 35, Universiteit Gent, B-9000 Gent, Belgium
²Department of Medical Microbiology, University Hospital Antwerp UIA, Belgium
³Klinik für Geflugel der Tierärztlichen Hochschule, Hannover, Germany
⁴Provinciaal Verbond voor Dierenziektenbestrijding, Torhout, Belgium
⁵Department of Biochemistry, University of Antwerp UIA, Belgium

Author for correspondence: P. Vandamme. Tel: +32 9 264 51 13. Fax: +32 9 264 50 92. e-mail: Peter. Vandamme{at}rug.ac.be

ABSTRACT

Twenty-four strains isolated mainly from infected respiratory tracts of pigeons were characterized by an integrated genotypic and phenotypic approach. An extensive biochemical examination using conventional tests and several API microtest systems indicated that all isolates formed a phenotypically homogeneous taxon with a DNA G+C content between 42 and 43 mol%. Whole-cell protein and fatty acid analysis revealed an unexpected heterogeneity which was confirmed by DNA-DNA hybridizations. Four main genotypic sub-groups (genomovars) were delineated. 16S rDNA sequence analysis of a representative strain indicated that this taxon belongs to the beta-subclass of the Proteobacteria with Taylorella equigenitalis as its closest neighbour (about 94·8% similarity). A comparison of phenotypic and genotypic characteristics of both taxa suggested that the pigeon isolates represented a novel genus for which the name Pelistega is proposed. In the absence of differential phenotypic characteristics between the genomovars, it was preferred to include all of the isolates into a single species, Pelistega europaea, and strain LMG 10982 was selected as the type strain. The latter strain belongs to fatty acid cluster I and protein electrophoretic sub-group 1, which comprise 13 and 5 isolates, respectively. It is not unlikely that the name P. europaea will be restricted in the future to organisms belonging to fatty acid cluster I, or even to protein electrophoretic sub-group 1, upon discovery of differential diagnostic features.

Key Words: Pelistega europaea • taxonomic structure • pigeon

The EMBL accession number for the strain LMG 10982^Tsequence reported in this paper is Y11890.

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