Microaerotolerant strains of gram-negative, nonsporing rod-shaped bacteria were isolated from two nonhuman sources (sewage sludge and ). These strains were saccharolytic, produced acetic, propionic, and succinic acids and traces of isobutyric, isovaleric, and lactic acids, contained sphingolipids, and were metronidazole susceptible. One strain, which was used for menaquinone analysis, contained MK-9, MK-10, and MK-11 respiratory quinones. The guanine-plus-cytosine contents of the deoxyribonucleic acids ranged from 38 to 41 mol%. I concluded that these strains, although they are able to grow slowly in an aerobic atmosphere, represent members of the genus .


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