Klebsiella

Klebsiella is a genus of Gram-negative, oxidase-negative, rod-shaped bacteria with a prominent polysaccharide-based capsule.<ref name=Sherris>Template:Cite book</ref>

Klebsiella is named after German-Swiss microbiologist Edwin Klebs (1834–1913). Carl Friedlander described Klebsiella bacillus which is why it was termed Friedlander bacillus for many years. The species of Klebsiella are all gram-negative and usually non-motile. They tend to be shorter and thicker when compared to others in the family Enterobacteriaceae.

Klebsiella species are found everywhere in nature. This is thought to be due to distinct sublineages developing specific niche adaptations, with associated biochemical adaptations which make them better suited to a particular environment. They can be found in water, soil, plants, insects and other animals including humans,<ref name="Bagley">Template:Cite journal</ref><ref name="Brisse" /> including as part of the human and animal's normal flora in the nose, mouth and intestines.

List of species

• K. aerogenes, previously known as Enterobacter aerogenes and Bacterium aerogenes
• K. granulomatis
• K. oxytoca
• K. michiganensis
• K. pneumoniae (type-species)
  • K. p. subsp. ozaenae
  • K. p. subsp. pneumoniae
  • K. p. subsp. rhinoscleromatis
• K. quasipneumoniae
  • K. q. subsp. quasipneumoniae
  • K. q. subsp. similipneumoniae
• K. grimontii
• K. variicola

Features

Klebsiella bacteria tend to be rounder and thicker than other members of the family Enterobacteriaceae. They typically occur as straight rods with rounded or slightly pointed ends. They can be found singly, in pairs, or in short chains. Diplobacillary forms are commonly found in vivo.<ref name=Ristuccia />

They have no specific growth requirements and grow well on standard laboratory media, but grow best between 35 and 37 °C and at pH 7.2.<ref>Template:Cite journal</ref> The species are facultative anaerobes, and most strains can survive with citrate and glucose as their sole carbon sources and ammonia as their sole nitrogen source.<ref name=Ristuccia />

Members of the genus produce a prominent capsule, or slime layer, which can be used for serologic identification, but molecular serotyping may replace this method.<ref>Template:Cite journal</ref>

Members of the genus Klebsiella typically express two types of antigens on their cell surfaces. The first, O antigen, is a component of the lipopolysaccharide (LPS), of which 9 varieties exist. The second is K antigen, a capsular polysaccharide with more than 80 varieties.<ref>Template:Cite journal</ref> Both contribute to pathogenicity and form the basis for serogrouping. Based on those two major antigenic determinants several vaccines have been designed.<ref>Template:Cite journal</ref>

In humans

Klebsiella species are routinely found in the human nose, mouth, and gastrointestinal tract as normal flora; however, they can also behave as opportunistic human pathogens.<ref name=Ristuccia>Template:Cite journal</ref> Klebsiella species are known to also infect a variety of other animals, both as normal flora and opportunistic pathogens.<ref name=Bagley />

Klebsiella organisms can lead to a wide range of disease states, notably pneumonia, urinary tract infections, sepsis, meningitis, diarrhea, peritonitis and soft tissue infections.<ref name=Ristuccia /><ref name=Podschun_1998>Template:Cite journal</ref> Klebsiella species have also been implicated in the pathogenesis of ankylosing spondylitis and other spondyloarthropathies.<ref>Template:Cite book</ref> The majority of human Klebsiella infections are caused by K. pneumoniae, followed by K. oxytoca. Infections are more common in the very young, very old, and those with other underlying diseases, such as cancer,<ref name=Bagley /> and most infections involve contamination of an invasive medical device.<ref name=Ristuccia />

During the last 40 years, many trials for constructing effective K. pneumoniae vaccines have been tried,<ref>Template:Cite journal</ref> and new techniques were followed to construct vaccines against Klebsiella.<ref>Template:Cite journal</ref> However, currently, no Klebsiella vaccine has been licensed for use in the US. K. pneumoniae is the most common cause of nosocomial respiratory tract and premature intensive care infections, and the second-most frequent cause of Gram-negative bacteraemia and urinary tract infections . Drug-resistant isolates remain an important hospital-acquired bacterial pathogen, add significantly to hospital stays, and are especially problematic in high-impact medical areas such as intensive care units. This antimicrobial resistance is thought to be attributable mainly to multidrug efflux pumps.<ref>Template:Cite journal</ref> The ability of K. pneumoniae to colonize the hospital environment, including carpeting, sinks, flowers, and various surfaces, as well as the skin of patients and hospital staff, has been identified as a major factor in the spread of hospital-acquired infections.<ref name=Bagley />

In animals

In addition to certain Klebsiella spp. being discovered as human pathogens, others such as K. variicola have been identified as emerging pathogens in humans and animals alike. For instance, K. variicola has been identified as one of the causes of bovine mastitis.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>

In plants

In plant systems, Klebsiella can be found in a variety of plant hosts. K. pneumoniae and K. oxytoca are able to fix atmospheric nitrogen into a form that can be used by plants, thus are called associative nitrogen fixers or diazotrophs.<ref name=Brisse>Template:Cite book</ref><ref>Template:Cite journal</ref> The bacteria attach strongly to root hairs and less strongly to the surface of the zone of elongation and the root cap mucilage.<ref>Template:Cite journal</ref> They are bacteria of interest in an agricultural context, due to their ability to increase crop yields under agricultural conditions.<ref>Template:Cite journal</ref> Their high numbers in plants are thought to be at least partly attributable to their lack of a flagellum, as flagella are known to induce plant defenses.<ref>Template:Cite journal Template:Open access</ref> Additionally, K. variicola is known to associate with a number of different plants including banana trees,<ref>Template:Cite journal</ref> sugarcane<ref>Template:Cite journal</ref> and has been isolated from the fungal gardens of leaf-cutter ants.<ref>Template:Cite journal</ref>

See also

• Raoultella

External links

• Klebsiella article from eMedicine.com