General Information: Human gut bacterium. This species is a normal inhabitant of the healthy human gut. Newborns, especially those that are breast-fed, are colonized with Bifidobacteria within days after birth. This species was first isolated from the feces of a breast-fed infant. In one comprehensive 16S rDNA sequence-based enumeration of the colonic microbiota of three healthy adult humans it represents, on average, 0.008% of all 16S rDNA sequences and 4.302% of the sequences in its division (Eckburg et. They are saccharolytic organisms that produce acetic and lactic acids without generation of CO2, except during degradation of gluconate.