Klebsiella Trevisan 1885 (Approved Lists 1980)
General information
Description and emendation
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1: Klebsiella species are facultatively anaerobic, Gram-negative, non-motile, generally straight rods arranged singly, in pairs or in short chains and measuring 0.3-1.0 μm in diameter and 0.6-6.0 μm in length. K. granulomatis is pleomorphic, i.e. curved or straight rods, coccoid, diplococcoid, ovoid or elliptical in shape. Most Klebsiella species are capsulated, though K. granulomatis may be capsulated (mature form) or non-capsulated (immature form). Most species are cultivable on routine microbiological media. K. granulomatis is facultatively intracellular, residing within the cytoplasm of large mononuclear cells and cannot be cultured on routine microbiological media. There are currently five recognized species of Klebsiella: K. pneumoniae, Klebsiella oxytoca, Klebsiella terrigena, Klebsiella planticola and Klebsiella ornithinolytica and three recognized subspecies of K. pneumoniae; K. pneumoniae subsp. pneumoniae, K. pneumoniae subsp. ozaenae and K. pneumoniae subsp. rhinoscleromatis. In the absence of DNA-DNA hybridization studies it is not possible to determine whether K. granulomatis is a sixth Klebsiella species or a fourth subspecies of K.pneumoniae.
2: Straight rods, 0.3-1.0 μm in diameter and 0.6-6.0 μm in length, arranged singly, in pairs or short chains. Conform to the general definition of the family Enterobacteriaceae. Capsulated. Gram-negative. Non-motile. Facultatively anaerobic, having both a respiratory and a fermentative type of metabolism. Grow on meat extract medium, producing more or less dome-shaped, glistering colonies of varying degrees of stickiness, depending on the strain and the composition of the medium. Does not grow at 10°C. There are no special growth factor requirements. Oxidase-negative, catalase-positive. Most strains can use citrate and glucose as sole carbon source, but cannot use L-sorbose as sole carbon source. Glucose is fermented with the production of acid and gas and most strains produce 2,3-butanediol as a major end product of glucose fermentation. Voges-Proskauer test is usually positive. Recovered from mammal mucosae, including human specimens.
Subdivision(s)
MID | Name | Rank | Taxon ID |
---|---|---|---|
M022506080212003 | Klebsiella aerogenes | Species | 548 |
M022506080212004 | Klebsiella granulomatis | Species | 39824 |
M022506080212005 | Klebsiella grimontii | Species | 2058152 |
M022506080212002 | Klebsiella huaxiensis | Species | 2153354 |
M022506080212006 | Klebsiella michiganensis | Species | 1134687 |
M022506080212007 | Klebsiella oxytoca | Species | 571 |
M022506080212001 | Klebsiella pneumoniae | Species | 573 |
M022506080212008 | Klebsiella quasipneumoniae | Species | 1463165 |
M022506080212009 | Klebsiella variicola | Species | 244366 |