Legionella pneumophila: Difference between revisions

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==Gallery==
==Gallery==
[[File:Legionella microscopy.jpg|thumb|Colorized scanning electron micrograph (SEM) depicted a large grouping of Gram-negative Legionella pneumophila bacteria.<sup>Courtesy of Janice Haney Carr, Public Health Image Library<ref name=PHIL1>{{cite web |url=http://phil.cdc.gov/phil/details.asp |title=Public Health Image Library |last1=Haney Carr |first1=Janice |website= www.cdc.gov |access-date= Jan 15 2016}}</ref></sup>]]
File:Legionella microscopy.jpg|thumb|Colorized scanning electron micrograph (SEM) depicted a large grouping of Gram-negative Legionella pneumophila bacteria.<sup>Courtesy of Janice Haney Carr, Public Health Image Library<ref name=PHIL1>{{cite web |url=http://phil.cdc.gov/phil/details.asp |title=Public Health Image Library |last1=Haney Carr |first1=Janice |website= www.cdc.gov |access-date= Jan 15 2016}}</ref></sup>
==References==
==References==
{{Reflist|2}}
{{Reflist|2}}


[[Category:Proteobacteria]]
[[Category:Proteobacteria]]

Revision as of 17:24, 15 January 2016

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Legionella pneumophila
TEM image of L. pneumophila
TEM image of L. pneumophila
Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Gamma Proteobacteria
Order: Legionellales
Family: Legionellaceae
Genus: Legionella
Species: L. pneumophila
Binomial name
Legionella pneumophila
Brenner DJ, Steigerwalt AG, McDade JE 1979
This page is about microbiologic aspects of the organism(s).  For clinical aspects of the disease, see Legionellosis.

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

L.pneumophila is a ubiquitous aquatic organism that thrives in warm environments (32°- 45°C). L. pneumophila is pleomorphic, aerobic, catalase-positive, oxidase-positive, non-spore-forming, non-capsulated, motile, Gram-negative bacteria. Although Legionella is categorized as a Gram-negative bacterium, it stains poorly to Gram stain due to its unique lipopolysaccharide-content in the outer psuedospamodulating leaflet of the outer cell membrane.

Microbiological Classification

  • Bacteria; Proteobacteria; Gammaproteobacteria; Legionellales; Legionellaceae
  • Species of Legionella include:
  • L. pneumophila (most common)
  • L. feeleii
  • L. sainthelensi

Microbiological Characteristics

  • L.pneumophila is a ubiquitous aquatic organism that thrives in warm environments (32°- 45°C).
  • L. pneumophila is pleomorphic, aerobic, catalase-positive, oxidase-positive, non-spore-forming, non-capsulated, motile, Gram-negative bacteria.
  • Although Legionella is categorized as a Gram-negative bacterium, it stains poorly to Gram stain due to its unique lipopolysaccharide-content in the outer psuedospamodulating leaflet of the outer cell membrane.[1]
  • Legionella is non-fermentative and is unable to hydrolyse gelatin or produce urease.
  • At least 46 species and 70 serogroups of Legionella have been identified.

Life Cycle

  • There are two major phases to the life cycle.
  • The first is called the replicative phase. During this period, the bacteria are nonmotile and have a low toxicity.
  • In the second phase, called the infectious phase, the bacteria are shorter and thicker.

Gallery

File:Legionella microscopy.jpg|thumb|Colorized scanning electron micrograph (SEM) depicted a large grouping of Gram-negative Legionella pneumophila bacteria.Courtesy of Janice Haney Carr, Public Health Image Library[2]

References

  1. Ryan KJ; Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed. ed.). McGraw Hill. ISBN 0-8385-8529-9.
  2. Haney Carr, Janice. "Public Health Image Library". www.cdc.gov. Retrieved Jan 15 2016. Check date values in: |access-date= (help)