Legionella pneumophila: Difference between revisions
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*Bacteria; Proteobacteria; Gammaproteobacteria; Legionellales; Legionellaceae | *Bacteria; Proteobacteria; Gammaproteobacteria; Legionellales; Legionellaceae | ||
*Species of ''Legionella'' include: | *Species of ''Legionella'' include: | ||
:*''L. pneumophila'' | :*''L. pneumophila'' (most common) | ||
:*''L. feeleii'' | :*''L. feeleii'' | ||
:*''L. sainthelensi'' | :*''L. sainthelensi'' | ||
| Line 44: | Line 44: | ||
:*In the second phase, called the infectious phase, the bacteria are shorter and thicker. | :*In the second phase, called the infectious phase, the bacteria are shorter and thicker. | ||
==Gallery== | |||
[[File:Legionella microscopy.jpg|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 17:23, 15 January 2016
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Legionellosis Microchapters |
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Diagnosis |
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Treatment |
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Case Studies |
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Legionella pneumophila On the Web |
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American Roentgen Ray Society Images of Legionella pneumophila |
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Risk calculators and risk factors for Legionella pneumophila |
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| TEM image of L. pneumophila TEM image of L. pneumophila
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| 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
![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]](/index.php/File:Legionella_microscopy.jpg)
References
- ↑ Ryan KJ; Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed. ed.). McGraw Hill. ISBN 0-8385-8529-9.
- ↑ Haney Carr, Janice. "Public Health Image Library". www.cdc.gov. Retrieved Jan 15 2016. Check date values in:
|access-date=(help)