Also found in: Encyclopedia.
A broad term for bacilli present in the intestinal tract. Included are gram-negative non–spore-forming facultatively anaerobic bacilli such as Escherichia, Shigella, Salmonella, Klebsiella, and Yersinia. They may be present in the intestines of vertebrates as normal flora or pathogens.
Medical Dictionary, © 2009 Farlex and Partners