Citrobacter farmeri, typically known as Citrobacter freundii, is a motile species of bacteria​​​​​​. These bacteria are commonly found either singly or in pairs, lack a capsule, and exhibit motility, which allows them to move. Citrobacter species, including C. farmeri, are able to move usually by means of flagella which are thin, tail-like structures that rotate to propel the bacteria​​.



Additionally, the ability of Citrobacter species to display swarming motility, which is a rapid and coordinated movement of a bacterial population across solid or semi-solid surfaces, can be influenced by factors such as agar concentration and the nutrient composition of the medium. For instance, Citrobacter freundii cells were unable to swarm on M9 minimal media, although they showed normal swimming motility in M9 liquid media, indicating that swarming requires specific inducers that are not present in minimal media​​.


The motility of C. farmeri is not only important for its ability to colonize and infect hosts but also for its differentiation from other Enterobacteriaceae during diagnostic tests in laboratory settings​
Motile,
Flagella,
Swimming motility,
Swarming motility,
Agar concentration,
Nutrient composition,
Enterobacteriaceae differentiation,
Diagnostic tests,
No capsule,
Temperature of 37 °C optimal growth,
Positive Voges-Proskauer tesT,
Gelatin liquefaction ability,

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