What is Klebsiella pneumoniae?
{{Taxobox | name = ''Klebsiella pneumoniae'' | image = Klebsiella_pneumoniae_01.png | image_width = 240px | image_caption = ''K. pneumoniae'' on a [[MacConkey agar|MacConkey]] [[agar plate]]. | regnum = [[Bacteria]] | phylum = [[Proteobacteria]] | classis = [[Proteobacteria|Gamma Proteobacteria]] | ordo = [[Enterobacteriaceae|Enterobacteriales]] | familia = [[Enterobacteriaceae]] | genus = ''[[Klebsiella]]'' | species = '''''K. pneumoniae''''' | binomial = ''Klebsiella pneumoniae'' | binomial_authority = (Schroeter 1886)<br>Trevisan 1887 }} '''''Klebsiella pneumoniae''''' is a [[Bacteria|bacterium]] in the genus [[Klebsiella]]. It is a major cause of [[pneumonia]], found in the normal flora of the [[mouth]], [[skin]], and [[intestine]]s. Like other [[Proteobacteria]], it is [[Gram-negative|gram negative]]. [[:en:Carl Friedländer|Carl Friedländer]] originally identified ''Klebsiella pneumoniae'' in 1882 as a bacteria found in the [[lung]]s of pneumonia sufferers (Friedlaender, 1882<ref>{{Citation|last1=Ashurst|first1=John V.|title=Klebsiella Pneumonia|date=2022|url=http://www.ncbi.nlm.nih.gov/books/NBK519004/|work=StatPearls|place=Treasure Island (FL)|publisher=StatPearls Publishing|pmid=30085546|access-date=2022-07-26|last2=Dawson|first2=Adam}}</ref>). It is common in [[nature]] and may be found in both [[soil]] and [[water]]. It lives in dead or [[:en:Decomposition|decaying matter]]. There are many different [[:en:Variant (biology)|variants]] within the whole species ([[Strain (biology)|strains]]) and the 20% of those can capture [[nitrogen]] from the [[Atmosphere of Earth|atmosphere]] and [[:en:Nitrogen fixation|fix nitrogen]] when growing in the absence of oxygen. ''K. pneumoniae'' also happen in places that aren't feces-contaminated, including [[industrial waste]]s that are rich in nutrients (Bagley and Seidler, 1977<ref>{{Cite journal|last1=Bagley|first1=Susan T.|last2=Seidler|first2=Ramon J.|date=May 1977|title=Significance of Fecal Coliform-Positive Klebsiella|journal=Applied and Environmental Microbiol