Bacteroides fragilis may prevent intestinal inflammatory disease as this
bacteria produces Polysaccharide A (PSA), which suppresses the inflammatory response of the immune system (by suppressing IL-17 production). The combination of Bacteroides fragilis ATCC 25285, Clostridium difficile ATCC 700057 and Fusobacterium necrophorum ATCC 25286 produce odor associated with flatulence.