Citrobacter freundii strain 705SK3

Citrobacter freundii strain 705SK3 is a Gram-negative, rod-shaped bacterium characterized as a facultative anaerobe. It is known to possess true flagella, enabling motility. This strain has three replicons, indicating a complex genomic structure. Its habitats include hospital sewage, the intestinal tract of various hosts, soil, and surface waters, suggesting a versatile ecological niche. This strain has a broad range of hosts, including Homo sapiens, various mammals such as Canis lupus familiaris (dogs) and Felis catus (cats), and other animals like Oryctolagus cuniculus (rabbits) and aquatic species like Tilapia and Cyprinus carpio. The presence of C. freundii in such diverse hosts points to its adaptability and potential for transmission across species. C. freundii strain 705SK3 is associated with opportunistic infections, particularly in humans where it can cause infections of the urinary and respiratory tracts. It is also implicated in respiratory tract infections in dogs, pleuritis, and urinary tract infections in cats, as well as infections in horses. These health effects highlight the bacterium's role as an opportunistic pathogen, particularly in compromised hosts. The presence of C. freundii in both sewage and the intestinal tracts of various animals underscores its ecological significance. It may play a role in the microbial dynamics of hospital environments and natural ecosystems, contributing to nutrient cycling and the potential spread of antibiotic resistance. Understanding its ecology and pathogenic potential is essential for managing health risks associated with this bacterium.