A new species, sp. nov., is proposed for black-pigmented, asaccharolytic strains from cats, isolated from subcutaneous abscesses and empyemas, as well as from gingival margins of normal mouths. The bacterium is an obligately anaerobic, gram-negative, brown- or black-pigmented, asaccharolytic, nonmotile, nonsporeforming rod that does not grow in 20% bile and has a guanine-plus-cytosine content of 42 to 44 mol%. It has 12% deoxyribonucleic acid homology with the human type strain of (ATCC 33277) and 1% deoxyribonucleic acid homology with the human type strain of (ATCC 25260). Strain VPB 157 (NCTC 11632) is the type strain. Unlike produces catalase, and the colonies of the type strain fluoresce at 24 and 48 h, although some other strains do not fluoresce. It does not agglutinate sheep erythrocytes. Unlike either or , it has trypsinlike activity and produces large quantities of phenylacetic acid.


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