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Legionella Plate 01.png
Legionella sp. under ultraviolet illumination
Scientific classification
Domain: Bacteria
Phylum: Proteobacteria
Class: Gammaproteobacteria
Order: Legionellales
Families and genera


The Legionellales are an order of Proteobacteria. Like all Proteobacteria, they are Gram-negative.[1] They comprise two families, typified by Legionella and Coxiella, both of which include notable pathogens. For example, Q fever is caused by Coxiella burnetii and Legionella pneumophila causes Legionnaires' disease[2][3][4] and Pontiac fever.[5][6][7]


  1. ^ George M. Garrity: Bergey's Manual of Systematic Bacteriology. 2. Auflage. Springer, New York, 2005, Volume 2: The Proteobacteria, Part B: The Gammaproteobacteria
  2. ^ Fraser, D.W., Tsai, T,. Orenstein, W., et al. (1977). Legionnaires' disease: description of an epidemic of pneumonia. New England Journal of Medicine. 297:1189–1197.
  3. ^ "Legionella Risk Assessment". Archived from the original on June 14, 2017. Retrieved June 14, 2017. 
  4. ^ McDade, JE., Shepard, C.C., Fraser, D.W., et al., (1977) Legionnaires' Disease — Isolation of a Bacterium and Demonstration of Its Role in Other Respiratory Disease. New England Journal of Medicine. 297: 1197–1203.
  5. ^ "General Information- Pontiac Fever". HPA. Retrieved 2013-04-07. 
  6. ^ http://jid.oxfordjournals.org/content/191/9/1530.full.pdf
  7. ^ "Pontiac Fever Due to Legionella micdadei from a Whirlpool Spa: Possible Role of Bacterial Endotoxin". Jid.oxfordjournals.org. Retrieved 2013-04-07. 

External links[edit]

  • Legionellales LPSN List of Prokaryotic names with Standing in Nomenclature