The results of deoxyribonucleic acid-deoxyribonucleic acid hybridization studies demonstrated a high degree of relatedness among “Haemophilus somnus,” “Haemophilus agni” “Histophilus ovis,” strains isolated from the preputial cavities of rams, and strains isolated from clinical cases of epididymitis in rams. The degree of relatedness between “Haemophilus somnus” and Actinobacillus seminis or Haemophilus influenzile was very small. From the results of our hybridization studies and previous studies on morphological characteristics, serology, and biochemical activity, we conclude that “Haemophilus somnus,” “Haemophilus agni,” and “Histophilus ovis” should be considered a single species. Inclusion in the genus Haemophilus 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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