''Bacteroides fragillis'' is a [[Pathogenic anaerobic non-spore-forming Gram-negative species - Overview|pathogenic, anaerobic, non-spore-forming Gram-negative bacteria]]. It is an obligate anaerobe of the gut. | ''Bacteroides fragillis'' is a [[Pathogenic anaerobic non-spore-forming Gram-negative species - Overview|pathogenic, anaerobic, non-spore-forming Gram-negative bacteria]]. It is an obligate anaerobe of the gut. |