The 16S ribosomal DNA sequence of (formerly ), the causative organism of contagious equine metritis, was determined. A phylogenetic analysis of this sequence revealed a phylogenetic position of in the β subclass of the class apart from the position of , which belongs to the γ subclass of . A close phylogenetic relationship among , and was detected; and 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.


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