The results of deoxyribonucleic acid-deoxyribonucleic acid hybridization studies demonstrated a high degree of relatedness among ,” strains isolated from the preputial cavities of rams, and strains isolated from clinical cases of epididymitis in rams. The degree of relatedness between and or was very small. From the results of our hybridization studies and previous studies on morphological characteristics, serology, and biochemical activity, we conclude that and should be considered a single species. Inclusion in the genus does not appear to be appropriate. The data also suggest that bovine and ovine isolates may constitute two separate groups within the species. More extensive hybridization studies will be required for establishment of the definitive taxonomic position of this group of organisms.


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