Citrobacter is a genus of gram-negative bacteria in the family of the Enterobacteriaceae.

The species C. amalonaticus, C. koseri, and C. freundii use solely citrate as a carbon source. These bacteria can be found almost everywhere in soil, water, wastewater, etc. It can also be found in the human intestine. They are rarely the source of illnesses, except for infections of the urinary tract and infant meningitis.

References

• German National Resource Centre for Biological Material

Enterobacteria

Citrobacter | Citrobacter