Citrobacteris not considered to be an enteric pathogen because it is normal gut flora. Whenplated, Citrobacter colonies bare a strong resemblance to E. colicolonies. This group of bacteria is of small clinical interest. C. freundiiis suspected to cause diarrhea and possibly extraintestinal infections. C.diversus has been linked to a few cases of meningitis in newborns.
When sproutproducers get a false positive on their tests for E. coli O157:H7 it can oftenbe attributed to Citrobacter.