The genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 Raoultella is composed of Gram-negative

Gram-negative

Gram-negative bacteria are bacteria that do not retain crystal violet dye in the Gram staining protocol. In a Gram stain test, a counterstain is added after the crystal violet, coloring all Gram-negative bacteria with a red or pink color...

, oxidase-negative

Oxidase test

The oxidase test is a test used in microbiology to determine if a bacterium produces certain cytochrome c oxidases. It uses disks impregnated with a reagent such as N,N,N′,N′-tetramethyl-p-phenylenediamine or N,N-Dimethyl-p-phenylenediamine , which is also a redox indicator...

, aerobic

Aerobic

Aerobic is a word that means "requiring air", where "air" usually means oxygen.Aerobic may also refer to:* Aerobic exercise, prolonged exercise of moderate intensity* Aerobics, a form of aerobic exercise...

, non-motile

Motility

Motility is a biological term which refers to the ability to move spontaneously and actively, consuming energy in the process. Most animals are motile but the term applies to single-celled and simple multicellular organisms, as well as to some mechanisms of fluid flow in multicellular organs, in...

, capsulated facultatively anaerobic

Facultative anaerobic organism

A facultative anaerobic organism is an organism, usually a bacterium, that makes ATP by aerobic respiration if oxygen is present but is also capable of switching to fermentation...

, rods, (formerly designated Klebsiella

Klebsiella

Klebsiella is a genus of non-motile, Gram-negative, oxidase-negative, rod-shaped bacteria with a prominent polysaccharide-based capsule. It is named after the German microbiologist Edwin Klebs...

), in the family Enterobacteriaceae

Enterobacteriaceae

The Enterobacteriaceae is a large family of bacteria that includes many of the more familiar pathogens, such as Salmonella, Escherichia coli, Yersinia pestis, Klebsiella and Shigella. This family is the only representative in the order Enterobacteriales of the class Gammaproteobacteria in the...

. It is named after the French bacteriologist Didier Raoult

Didier Raoult

Didier Raoult is a French biology researcher. He hold MD and PhD degrees, and specializes in infectious diseases. He "is classified among the first ten French researchers by the journal Nature, for the number of his publications and for his citations number, as it was reported in 2008 by the...

.

Members of genus Raoultella grow at 10 °C consistent with their recovery from plants, soil and water, whereas members of Klebsiella (Klebsiella oxytoca

Klebsiella oxytoca

Klebsiella oxytoca is a Gram-negative, rod-shaped bacterium that is closely related to K. pneumoniae, from which it is distinguished by being indole-positive; it also has slightly different growth characteristics in that it is able to grow on melezitose, but not 3-hydroxybutyrate.- Industrial uses...

is an exception and a proposal to classify K. oxytoca in a separate, unnamed genus has been made.) do not grow at 10 °C and are mainly recovered from mammal's mucosae.

It consists of species Raoultella ornitholytica, Raoultella planticola

Raoultella planticola

Raoultella planticola is a gram-negative bacteria of the genus Raoultella. A number of strains have been identified. Raoultella planticola has been determined to cause severe pancreatitis in one case.- Taxonomic reclassification :...

and Raoultella terrigena.