Legionella pneumophila: Difference between revisions
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==Overview== | ==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, [[Endospore|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. | ''L.pneumophila'' is a ubiquitous aquatic organism that thrives in warm environments (32°- 45°C). ''L. pneumophila'' is a pleomorphic, aerobic, catalase-positive, oxidase-positive, [[Endospore|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== | ==Microbiological Classification== | ||
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==Microbiological Characteristics== | ==Microbiological Characteristics== | ||
*''L.pneumophila'' is a ubiquitous aquatic organism that thrives in warm environments (32°- 45°C). | *''L.pneumophila'' is a ubiquitous aquatic organism that thrives in warm environments (32°- 45°C). | ||
*''L. pneumophila'' is pleomorphic, aerobic, catalase-positive, oxidase-positive, [[Endospore|non-spore-forming]], non-capsulated, motile, Gram-negative bacteria. | *''L. pneumophila'' is a pleomorphic, aerobic, catalase-positive, oxidase-positive, [[Endospore|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.<ref name=Sherris>{{cite book | author = Ryan KJ; Ray CG (editors) | title = Sherris Medical Microbiology | edition = 4th ed. | publisher = McGraw Hill | year = 2004 | id = ISBN 0-8385-8529-9 }}</ref> | *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.<ref name=Sherris>{{cite book | author = Ryan KJ; Ray CG (editors) | title = Sherris Medical Microbiology | edition = 4th ed. | publisher = McGraw Hill | year = 2004 | id = ISBN 0-8385-8529-9 }}</ref> | ||
*''Legionella'' is non-fermentative and is unable to [[hydrolysis|hydrolyse]] [[gelatin]] or produce [[urease]]. | *''Legionella'' is non-fermentative and is unable to [[hydrolysis|hydrolyse]] [[gelatin]] or produce [[urease]]. | ||
Revision as of 22:14, 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 a 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
Microbiological Characteristics
- L.pneumophila is a ubiquitous aquatic organism that thrives in warm environments (32°- 45°C).
- L. pneumophila is a 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 under 8000x magnification.Courtesy of Janice Haney Carr, Public Health Image Library[2]](/index.php/File:Legionella_microscopy.jpg)
![Colorized scanning electron micrograph (SEM) depicted a large grouping of Gram-negative Legionella pneumophila bacteria under 10,000x magnification.Courtesy of Janice Haney Carr, Public Health Image Library[3]](/index.php/File:Legionella_microscopy_2.jpg)
![Legionella micdadei bacteria using TATLOCK conjugate in egg yolk sac suspension, DFA-stained photomicrograph with positive HEBA stain.Courtesy of Ann Herbert, Public Health Image Library[4]](/index.php/File:Pittsburgh_pneumonia_Legionella_micdadei.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) - ↑ Haney Carr, Janice. "Public Health Image Library". www.cdc.gov. Retrieved Jan 15 2016. Check date values in:
|access-date=(help) - ↑ Herbert, Anne. "Public Health Image Library". www.cdc.gov. Retrieved Jan 15 2016. Check date values in:
|access-date=(help)