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Citrobacter freundii is a species of facultative anaerobic Gram-negative bacteria of the family Enterobacteriaceae which currently consists of 13 recognized species. These bacteria have a rod shape with a typical length of 1–5 μm. Most C. freundii cells have several flagella used for locomotion, although some non-motile taxa do not.
Human microbiota are microorganisms (bacteria, viruses, fungi and archaea) found in a specific environment. They can be found in the stomach, intestines, skin, genitals and other parts of the body. [1] Various body parts have diverse microorganisms. Some microbes are specific to certain body parts and others are associated with many microbiomes.
The species C. amalonaticus, C. koseri, and C. freundii can use citrate as a sole carbon source. Citrobacter species are differentiated by their ability to convert tryptophan to indole (C. koseri is the only citrobacter to be commonly indole-positive), ferment lactose (C. koseri is a lactose fermentor), and use malonate. [3]
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Enterobacteriaceae is a large family of Gram-negative bacteria.It includes over 30 genera and more than 100 species. Its classification above the level of family is still a subject of debate, but one classification places it in the order Enterobacterales of the class Gammaproteobacteria in the phylum Pseudomonadota.
The average 70 kg (150 lb) adult human body contains approximately 7 × 10 27 atoms and contains at least detectable traces of 60 chemical elements. [5] About 29 of these elements are thought to play an active positive role in life and health in humans. [6]
At the UVA Medical Center, a transfer mechanism of KPC-dependent carbapenem resistance was discovered in the transmission of a plasmid carrying the transposon (Tn4401), which contains the KPC gene (bla KPC), to several bacteria including Enterobacter cloacae, Klebsiella oxytoca, E. coli, and Citrobacter freundii. [34]
It has been proposed that the needle complex is a universal feature of all T3SSs of pathogenic bacteria. [10] The needle complex starts at the cytoplasm of the bacterium, crosses the two membranes and protrudes from the cell. The part anchored in the membrane is the base (or basal body) of the T3SS. The extracellular part is the needle.