Legionella pneumophila: Difference between revisions
YazanDaaboul (talk | contribs) |
YazanDaaboul (talk | contribs) |
||
| Line 41: | Line 41: | ||
==Gallery== | ==Gallery== | ||
[[File:Legionella microscopy.jpg|thumb|alt=Colorized scanning electron micrograph (SEM) depicted a large grouping of Gram-negative Legionella pneumophila bacteria under 8000x magnification.<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|left|alt=Colorized scanning electron micrograph (SEM) depicted a large grouping of Gram-negative Legionella pneumophila bacteria under 8000x magnification.<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 2.jpg|300px]]<br><sup> 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<ref name=PHIL2>{{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 2.jpg|300px]]<br><sup> 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<ref name=PHIL2>{{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> | ||
Revision as of 22:18, 15 January 2016
|
Legionellosis Microchapters |
|
Diagnosis |
|---|
|
Treatment |
|
Case Studies |
|
Legionella pneumophila On the Web |
|
American Roentgen Ray Society Images of Legionella pneumophila |
|
Risk calculators and risk factors for Legionella pneumophila |
| Legionella pneumophila | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TEM image of L. pneumophila TEM image of L. pneumophila
| ||||||||||||||
| Scientific classification | ||||||||||||||
| ||||||||||||||
| Binomial name | ||||||||||||||
| Legionella pneumophila Brenner DJ, Steigerwalt AG, McDade JE 1979 |
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]
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]
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)