Legionella pneumophila: Difference between revisions

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

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Revision as of 17:45, 15 January 2016

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

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)

[Sherris-1] Ryan KJ; Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed. ed.). McGraw Hill. ISBN 0-8385-8529-9.

[PHIL1-2] Haney Carr, Janice. "Public Health Image Library". www.cdc.gov. Retrieved Jan 15 2016. Check date values in: |access-date= (help)

[PHIL2-3] Haney Carr, Janice. "Public Health Image Library". www.cdc.gov. Retrieved Jan 15 2016. Check date values in: |access-date= (help)

[PHIL3-4] Herbert, Anne. "Public Health Image Library". www.cdc.gov. Retrieved Jan 15 2016. Check date values in: |access-date= (help)

[1]

@@ Line 49: / Line 49: @@
 [[File:Legionella microscopy 2.jpg|300px|Colorized scanning electron micrograph (SEM) depicted a large grouping of Gram-negative Legionella pneumophila bacteria under 10,000x magnification.<sup>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:Pittsburgh pneumonia Legionella micdadei.jpg|300px|Legionella micdadei bacteria using TATLOCK conjugate in egg yolk sac suspension, DFA-stained photomicrograph with positive HEBA stain.<sup>Courtesy of Ann Herbert, Public Health Image Library<ref name=PHIL3>{{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:Pittsburgh pneumonia Legionella micdadei.jpg|300px|Legionella micdadei bacteria using TATLOCK conjugate in egg yolk sac suspension, DFA-stained photomicrograph with positive HEBA stain.<sup>Courtesy of Ann Herbert, Public Health Image Library<ref name=PHIL3>{{cite web |url=http://phil.cdc.gov/phil/details.asp |title=Public Health Image Library |last1=Herbert |first1=Anne |website= www.cdc.gov |access-date= Jan 15 2016}}</ref></sup>]]
 ==References==