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* ''Legionnaires' disease'' is the more severe form of the infection and produces [[pneumonia]].<ref name=Baron>{{cite book | author =  Winn WC Jr  | chapter = Legionella | title = Baron's Medical Microbiology ''(Baron S ''et al'', eds.)| edition = 4th ed. | publisher = Univ of Texas Medical Branch | year = 1996 | url = http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=mmed.section.2222 | isbn = 0-9631172-1-1 }}</ref>
* ''Legionnaires' disease'' is the more severe form of the infection and produces [[pneumonia]].<ref name=Baron>{{cite book | author =  Winn WC Jr  | chapter = Legionella | title = Baron's Medical Microbiology ''(Baron S ''et al'', eds.)| edition = 4th ed. | publisher = Univ of Texas Medical Branch | year = 1996 | url = http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=mmed.section.2222 | isbn = 0-9631172-1-1 }}</ref>
* ''Pontiac fever'' is  caused by the same bacterium, but produces a milder [[upper respiratory infection|respiratory illness]] without pneumonia which resembles [[Acute (medicine)|acute]] [[influenza]].<ref name=Baron />
* ''Pontiac fever'' is  caused by the same bacterium, but produces a milder [[upper respiratory infection|respiratory illness]] without pneumonia which resembles [[Acute (medicine)|acute]] [[influenza]].<ref name=Baron />
Legionnaires' disease acquired its name in 1976 when an [[outbreak]] of pneumonia occurred among people attending a convention of the American Legion in Philadelphia. On January 18, 1977 the causative agent was identified as a previously unknown [[bacterium]], subsequently named ''Legionella''.
An estimated 8,000 to 18,000 people get legionellosis in the United States each year.<ref> [http://www.cdc.gov/ncidod/dbmd/diseaseinfo/legionellosis_t.htm CDC: Incidence]</ref> Some people can be infected with the ''Legionella'' bacterium and have only mild symptoms or no illness at all.
Outbreaks of Legionnaires' disease receive significant media attention. However, this disease usually occurs as a single, isolated case not associated with any recognized outbreak. When outbreaks do occur, they are usually recognized in the summer and early autumn, though cases may occur at any time of year. The fatality rate of Legionnaires' disease has ranged from 5 to 30% during various outbreaks.


==References==
==References==

Revision as of 21:55, 9 February 2012

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Legionellosis is an infectious disease caused by bacteria belonging to the genus Legionella.[1] Over 90% of legionellosis cases are caused by Legionella pneumophila, a ubiquitous aquatic organism that thrives in warm environments (25 to 45 °C with an optimum around 35 °C).[2]

Legionellosis takes two distinct forms:

References

  1. Ryan KJ, Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed. ed.). McGraw Hill. ISBN 0838585299.
  2. CDC: Etiologic Agent
  3. 3.0 3.1 Winn WC Jr (1996). "Legionella". Baron's Medical Microbiology (Baron S et al, eds.) (4th ed. ed.). Univ of Texas Medical Branch. ISBN 0-9631172-1-1.


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