Deoxyribonucleic acid-deoxyribonucleic acid hybridization among 66 strains of catalase-positive and -like organisms delineated seven genetically distinct groups. Our results support the species designations of , and , although our data contraindicate the division of the latter species into subsp. and subsp. . Our deoxyribonucleic acid relatedness values also suggest that the “” and nalidixic acid-resistant thermophilic strains, as well as -like organisms isolated from mice, may deserve species status. -like isolates from bovine and ovine abortions possess morphological and metabolic characteristics that are incompatible with the genus description, and these isolates need further study to clarify their taxonomic status.


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