1887

Abstract

The phenotypes of 153 strains belonging or related to the genus were studied. These organisms included 38 collection strains and 115 wild strains (41 strains of human origin, 56 strains of animal origin, and 18 strains obtained from rivers or sewage). Our phenotypic analysis revealed seven main groups that were subdivided into 20 subgroups. Seven subgroups contained no type or collection strain. Among the human strains, the type strains of and fell into group I, which contained the type strains of (subgroup Ib), (subgroup Ic), and (ungrouped). The type strain of belonged to subgroup IIIa1, and the type strains of and fell into subgroup IIIb1. Group VII comprised only wild strains that were isolated from human infant feces. Among the animal strains, group II consisted mainly of bifidobacteria that were isolated from pig feces and contained the type strains of (subgroup IIb), (subgroup IIf), , and (ungrouped). Wild strains belonging to group V were isolated from pig, calf, cow, and chicken feces; this included the type strains of (subgroup Va), (subgroup Vb), , and (subgroup Vc). The strains of human origin (groups I, III, and VII) were well separated from the animal strains (groups II, IV, and V). It was not surprising that the wild strains isolated from surface water or sewage were distributed in the animal groups as well as the human groups. Thus, bifidobacteria can be considered to be successful indicators of human or animal fecal pollution when they are correctly classified. The acidification patterns were not adequate to differentiate species, as determined previously by Mitsuoka (Bifidobacteria Microflora 3:11-28, 1984) and Scardovi (p. 1418-1434, P. H. A. Sneath, N. S. Mair, M. E. Sharpe, and J. G. Holt, ed., , vol. 2, 1986). However, enzymatic tests furnished new taxonomic criteria for the genus.

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1991-10-01
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