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Legionnaires' disease organism, legionella
Legionnaires' disease organism, legionella


Definition:

Legionnaire's disease is an acute respiratory infection caused by Legionella bacteria.



Alternative Names:

Legionella pneumonia; Pontiac fever



Causes, incidence, and risk factors:

The bacteria that cause Legionnaire's disease have been found in water delivery systems. They can survive in the warm, moist, air conditioning systems of large buildings, including hospitals.

Most cases are caused by Legionella pneumophila. The rest of the cases are caused by other Legionella species.

Spread of the bacteria from person to person has not been proven.

Most infections occur in middle-aged or older people, although they have been reported in children. Typically, the disease is less severe in children.

Risk factors include:

  • Alcoholism
  • Cigarette smoking
  • Diseases such as kidney failure or diabetes
  • Diseases that weaken the immune system, including cancer
  • Long-term (chronic) lung disease, such as chronic obstructive pulmonary disease (COPD )
  • Long-term use of a breathing machine (ventilator)
  • Medicines that suppress the immune system, including chemotherapy and steroid medications
  • Older age


Symptoms:

Symptoms tend to get worse during the first 4 - 6 days. They typically improve in another 4 - 5 days.

Symptoms may include:

  • Chest pain
  • Coughing up blood
  • Fever
  • Gastrointestinal symptoms, such as diarrhea, nausea, vomiting, and abdominal pain
  • General discomfort, uneasiness, or ill feeling (malaise )
  • Headache
  • Joint pain
  • Lack of coordination (ataxia )
  • Loss of energy
  • Muscle aches and stiffness
  • Nonproductive cough
  • Shaking chills
  • Shortness of breath


Signs and tests:

The health care provider will perform a physical exam, and may hear abnormal sounds called crackles when listening to the chest with a stethoscope.

Tests that may be done include:



Treatment:

Antibiotics are used to fight the infection. Treatment is started as soon as Legionnaire's disease is suspected, without waiting for confirmation by lab test.

Antibiotics commonly used to treat this condition include:

  • Quinolones (ciprofloxacin, levofloxacin, moxifloxacin, or gatifloxacin)
  • Macrolides (azithromycin, clarithromycin, or erythromycin)

Other treatments may include:

  • Fluid and electrolyte replacement
  • Oxygen (given through a mask or breathing machine)


Support Groups:



Expectations (prognosis):

Legionnaire's disease can be life-threatening. The death rate is higher in patients with other diseases. The death rate for patients who develop Legionnaire's disease while in the hospital is close to 50%, especially when antibiotics are started late.



Complications:
  • Lung failure
  • Death


Calling your health care provider:

Make an appointment with your health care provider if you have any type of breathing problem.



Prevention:

Treating contaminated water delivery systems can prevent the spread of disease.



References:

Edelstein PH. Legionella infections. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier;2007:chap 335.




Review Date: 3/17/2009
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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789 Central Avenue, Dover, NH 03820
Phone: (603) 742-5252
Toll free: 1 (877) 201-7100