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Species/Subspecies: Klebsiella pneumoniae subsp. pneumoniae
Etymology: Genus name: named after the German bacteriologist Edwin Klebs (1834-1913). Species epithet: of pneumonia. Subspecies epithet: see Species epithet.
Significance:  [Very important]   
Type Strain: ATCC 13883 = CCUG 225 = NCTC 9633.
Macromorphology (smell):
Klebsiella pneumoniae Klebsiella pneumoniae Klebsiella pneumoniae 
Grey, round, shiny and mucoid colonies (>3 mm in diameter), which can be confused with colonies of Enterobacter spp. Does not give hemolysis on blood agar.
Micromorphology: Nonmotile rods (0.3-1.0 x 0.6-6.0 µm), which appear singly, in pars or in short chains.
Gram +/Gram -:
Fig 69:4. Gram staining of Klebsiella pneumoniae subsp. pneumoniae, strain CCUG 225 at two different degrees of magnification (A and B). The lengths of the scale bars are equivalent to 5 µm in both images. Date: 2011-08-30.
Metabolism: Facultatively anaerobic
Other Enzymes: β-glucoronidase - (cf. E. coli spp.), DNase -, esculinase +, ornithine decarboxylase -, tryptophanase - (= indol -), urease +.
Biochemical Tests: Citrate +, hydrogen sulfide -, methyl red -, Voges-Proskauer +.
Fermentation of carbohydrates:
Lactose + (although weaker than for instance E. coli). Ferments glucose under gas production.
Spec. Char.:
Special Media:
Klebsiella pneumoniae Klebsiella pneumoniae Klebsiella pneumoniae 
Klebsiella pneumoniae 
SELMA- or SELMA Plus plates are used for milk samples and CLED agar for urine samples.
Hosts: Cattle, calves (foals), mares and dogs
Disease (Swedish):Nötkreatur: mastit. Kalv och föl: lunginflammation. Sto: endometrit. Hund: urinvägsinfektion.
Disease (English):Cattle: coliform mastitis. Calf and foal: pneumonia. Mares: endometritis. Dog: urinary tract infections.
Clinical Picture:
Virulence Factors: LPS, capsule.
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_009648 MGH 78578 5 315 120 1c + 5c) 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AF130981 ATCC13883T 1 436 

 Klebsiella pneumoniae
Nine species have been described within genus Klebsiella. K. pneumoniae subsp. pneumoniae belongs to the family Enterobacteriaceae and is closely related to members of the genus Citrobacter. In fact, members of the genus Klebsiella and Citrobacter freundii form a monophyletic cluster (see Fig. 69:9 to the left).

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Swedish University of Agricultural Sciences