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Phylogenetic Position of Taylorella equigenitalis Determined by Analysis of Amplified 16S Ribosomal DNA Sequences

Department of Bacteriology, Institute of Infectious Diseases and Immunology, School of Veterinary Medicine, Universiteit Utrecht, P.O. Box 80.165, 3508 TD Utrecht, The Netherlands

^* Corresponding author.

ABSTRACT

The 16S ribosomal DNA sequence of Taylorella equigenitalis (formerly Haemophilus equigenitalis), the causative organism of contagious equine metritis, was determined. A phylogenetic analysis of this sequence revealed a phylogenetic position of T. equigenitalis in the β subclass of the class Proteobacteria apart from the position of Haemophilus influenzae, which belongs to the subclass of Proteobacteria. A close phylogenetic relationship among T. equigenitalis, Alcaligenes xylosoxidans, and Bordetella bronchiseptica was detected; Spirillum volutans and Chromobacterium fluviatile (Iodobacter fluviatile) were in the same group but slightly removed. This relationship is surprising in view of the considerable differences in the G+C contents of the genomes of these bacteria.