By deoxyribonucleic acid-deoxyribonucleic acid molecular hybridization, evidence was obtained that the bacteria of the group represent a distinct deoxyribonucleic acid homology group and are not indole-forming and gelatin-liquefying variants of and (sensu lato), respectively, and not a subgroup within , as had been suggested previously. The establishment of a new, but presently unnamed, genus of , with one species, is proposed, represented by strain 497-2 of R. Hugh (ATCC 13182). Furthermore, none of a series of bacterial strains classified as , or species was found to be related to or to the strains. The deoxyribonucleic acid reassociation values do not allow species differentiation within the true, indole-negative klebsiellae.


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