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] and Pontiac fever.[4][5][6]

Legionella sp. under ultraviolet illumination
Scientific classification
Families and genera

   "Ca. Berkiella"


  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. 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.
  4. "General Information- Pontiac Fever". HPA. Retrieved 2013-04-07.
  5. http://jid.oxfordjournals.org/content/191/9/1530.full.pdf
  6. Fields, Barry S.; Haupt, Thomas; Davis, Jeffrey P.; Arduino, Matthew J.; Miller, Phyllis H.; Butler, Jay C. (2001). "Pontiac Fever Due to Legionella micdadei from a Whirlpool Spa: Possible Role of Bacterial Endotoxin". The Journal of Infectious Diseases. Jid.oxfordjournals.org. 184 (10): 1289–1292. doi:10.1086/324211. PMID 11679917.
  • Legionellales LPSN List of Prokaryotic names with Standing in Nomenclature

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