Definition: A genus of aerobic, facultatively anaerobic, nonmotile, non-spore-forming bacteria (family Enterobacteriaceae) containing gram-negative, encapsulated rods that occur singly, in pairs, or in short chains. These organisms produce acetylmethylcarbinol and lysine decarboxylase or ornithine decarboxylase. They do not usually liquefy gelatin. Citrate and glucose are ordinarily used as sole carbon sources. These organisms may or may not be pathogenic. They occur in the respiratory, intestinal, and urogenital tracts of humans as well as in soil, water, and grain. The type species is Klebsiella pneumoniae.
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