Taxonomic Study of Bacteroides clostridiiformis subsp. clostridiiformis (Burri and Ankersmit) Holdeman and Moore and of Related Organisms: Proposal of Clostridium clostridiiformis (Burri and Ankersmit) comb. nov. and Clostridium symbiosum (Stevens) comb. nov.
Ninety-three strains of Bacteroides clostridiiformis subsp. clostridiiformis (Burri and Ankersmit) Holdeman and Moore, B. biacutus (Weinberg and Prévot) Holdeman and Moore, Fusobacterium symbiosum (Stevens) Moore and Holdeman, and related organisms, of which 75 were freshly isolated from the fecal material of humans, were studied systematically. They were differentiated into two genera, Clostridium and Bacteroides. We propose that, of the sporeforming strains, those having a guanine plus cytosine (G+C) content of about 49% to be considered C. clostridiiformis (Burri and Ankersmit) comb. nov., for which ATCC 25537 is designated as the neotype strain; those having a G+C content of about 56% be considered a new species in the genus Clostridium; and those having a G+C content of about 46% and producing butyric acid as a major product be considered C. symbiosum (Stevens) comb. nov., for which ATCC 14940 is designated as the neotype strain. Of the nonsporeforming strains, we propose that those having a G+C content of about 53% be considered a new species in the genus Bacteroides.
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Taxonomic Study of Bacteroides clostridiiformis subsp. clostridiiformis (Burri and Ankersmit) Holdeman and Moore and of Related Organisms: Proposal of Clostridium clostridiiformis (Burri and Ankersmit) comb. nov. and Clostridium symbiosum (Stevens) comb. nov.