Abstract
Deoxyribonucleic acid-deoxyribonucleic acid hybridization among 66 strains of catalase-positive Campylobacter and Campylobacter-like organisms delineated seven genetically distinct groups. Our results support the species designations of Campylobacter coli, Campylobacter jejuni, and Campylobacter fetus, although our data contraindicate the division of the latter species into C. fetus subsp. fetus and C. fetus subsp. venerealis. Our deoxyribonucleic acid relatedness values also suggest that the “Campylobacter fecalis“ and nalidixic acid-resistant thermophilic Campylobacter strains, as well as Campylobacter-like organisms isolated from mice, may deserve species status. Campylobacter-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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