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Legionellosis

Legionellosis is an infection caused by species of the bacterium Legionella, most notably L. pneumophila. At least 46 species and 70 serogroups have been identified. L. pneumophila, a ubiquitous aquatic organism that thrives in warm environments (25 to 45 °C with an optimum around 35 °C) causes over 90 % of Legionnaires Disease. more...

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The disease has two distinct forms:

  • Legionnaires' disease is the name for the more severe form of infection which includes pneumonia
  • Pontiac fever is a milder respiratory illness without pneumonia caused by the same bacterium

Legionnaires' disease acquired its name in 1976 when an outbreak of pneumonia occurred among persons attending a convention of the American Legion in Philadelphia. Later, the bacterium causing the illness was named Legionella.

On January 18, 1977 scientists identified a previously unknown bacterium as the cause of the mysterious "Legionnaires' disease."

An estimated 8,000 to 18,000 people get Legionnaires' disease in the United States each year. Some people can be infected with the Legionella bacterium and have 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 fall, but cases may occur year-round. About 5% to 30% of people who have Legionnaires' disease die.

Symptoms

Patients with Legionnaires' disease usually have fever, chills, and a cough, which may be dry or may produce sputum. Some patients also have muscle aches, headache, tiredness, loss of appetite, and, occasionally, diarrhea. Laboratory tests may show that these patients' kidneys are not functioning properly. Chest X-rays often show pneumonia. It is difficult to distinguish Legionnaires' disease from other types of pneumonia by symptoms alone; other tests are required for diagnosis.

Persons with Pontiac fever experience fever and muscle aches and do not have pneumonia. They generally recover in 2 to 5 days without treatment.

The time between the patient's exposure to the bacterium and the onset of illness for Legionnaires' disease is 2 to 10 days; for Pontiac fever, it is shorter, generally a few hours to 2 days.

Infections

Intestinal Infections: These may only occur as part of respiratory infections, where gastrointestinal symptoms have on occasion been described.

Extraintestinal Infections: L. pneumophila is specifically considered as a pathogen of the respiratory tract, where it is a cause of atypical pneumonia, also known as Legionnaires' disease. Other infections have also been reported, including haemodialysis fistulae, pericarditis and wound and skin infections. Bacteraemia is often associated with Legionnaires' disease.

One species Legionella Longbeachae is contracted via inhaling infected compost or soil.

Read more at Wikipedia.org


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Cruise-ship-associated Legionnaires Disease, November 2003-May 2004. : An article from: Morbidity and Mortality Weekly Report $5.95 Legionellosis $73.31
The Official Patient's Sourcebook on Legionellosis: A Revised and Updated Directory for the Internet Age $28.95 Preventing Legionellosis $130.00
Prevention or Control of Legionellosis: Including Legionaire's Disease $21.14 Legionnaires disease associated with potable water in a hotel--Ocean City, Maryland, October 2003-February 2004. : An article from: Morbidity and Mortality Weekly Report $5.95
Legionellosis from Legionella pneumophila serogroup 13.(RESEARCH) : An article from: Emerging Infectious Diseases $5.95 Legionnaire's disease: a current update.(Clinical Practice) : An article from: MedSurg Nursing $5.95
Cerebellar involvement in legionellosis.(Review Article) : An article from: Southern Medical Journal $5.95 The Prevention or Control of Legionellosis (Including Legionnaires' Disease)

Legionellosis from Legionella pneumophila serogroup 13
We describe 4 cases of Legionella pneumophila serogroup 13-associated pneumonia. These cases originate from a broad geographic range that includes Scotland, ...
Levofloxacin efficacy in the treatment of community-acquired legionellosis
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Preventive Low Dose Antibiotics Have No Effect On Nosocomial Legionellosis Morbidity - Abstract
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A hospital outbreak of Legionella from a contaminated water supply
The authors performed a cross-sectional epidemiological survey to investigate the source of a hospital Legionella outbreak originating in contaminated ...
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Fluoroquinolones vs macrolides in the treatment of legionnaires disease
Background: Erythromycin has been the treatment of choice for Legionnaires disease (LD). However, treatment failure and experimental evidence of its ...
Legionnaires disease associated with potable water in a hotel—Ocean City, Maryland, October 2003-February 2004
During October 2003-February 2004, eight cases (seven confirmed cases and one possible) of Legionnaires disease (LD) were identified among guests at ...
Legionnaires' disease: detectable, curable, and preventable; Industry experts Robert F. Whitcomb and Edwin F. Goldstein reveal overlooked facility sources
In 1977, it was discovered that Legionnaires' disease (LD), a respiratory illness, was caused by a new family of bacteria. Although we now know how to identify and treat it, many still needlessly d

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