friendly bacteria, lactobacillus casei. a rod-shaped gram-positive, non-sporing, non-motile, obligate anaerobe, which inhabits human intestinal tracts. - immune modulation stock videos & royalty-free footage00:18Friendly bacteria, Lactobacillus casei. A rod-shaped gram-positive, non-sporing, non-motile, obligate anaerobe, which inhabits human intestinal tracts.Micro Organism