Citrobacter koseri

**Semantic type:** Bacterium

**Definition:** A species of facultatively anaerobic, gram negative, rod shaped bacteria assigned to the phylum Proteobacteria. This species is motile by peritrichous flagella, does not produce H2S in TSI agar, grows in media containing KCN, produces acid from adonitol and D-arabitol and does not decarboxylate lysine. C. koseri is found in soil, water, sewage and food and is a commensal organism of the urinary and gastrointestinal tracts of humans but may become pathogenic in immunocompromised individuals.

**Synonyms:** - CITROBACTER KOSERI - Citrobacter diversus - Citrobacter diversus