Bifidobacterium
Introduction
Bifidobacteria, called probiotics, are a natural part of the bacterial flora in the human body and have a symbiotic bacteria-host relationship with humans. B. longum promotes good digestion, boosts the immune system, and produces lactic and acetic acid that controls intestinal pH. These bacteria also inhibit the growth of Candida albicans, E. coli, and other bacteria that have more pathogenic qualities than Bifidobacteria.
( From MicrobeWiki )
( Further Information: Wikipedia, ScienceDirect )
Under the microscope:
Bifidobacterium