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Lungs
Lungs


Respiratory system
Respiratory system


Psittacosis

Definition:

Psittacosis is an infection caused by Chlamydophila psittaci, a type of bacteria found in the droppings of birds. Birds spread the infection to humans.



Alternative Names:

Ornithosis; Chlamydia psittaci



Causes, incidence, and risk factors:

Psittacosis is a rare disease: 100 - 200 cases are reported each year in the United States.

Bird owners, pet shop employees, persons who work in poultry processing plants, and veterinarians are at increased risk for this infection. Typical birds involved are parrots, parakeets, and budgerigars, although other birds have also caused the disease.



Symptoms:

Signs and tests:

The health care provider will hear abnormal lung sounds such as crackles and decreased breath sounds when listening to the chest with a stethoscope.

Tests include:



Treatment:

The infection is treated with antibiotics. Doxycycline is used first. Other antibiotics that may be prescribed include:

  • Macrolides
  • Fluoroquinolones
  • Other tetracycline antibiotics

Note: Tetracycline and doxycycline by mouth is usually not prescribed for children until after all their permanent teeth have started to grow in or to pregnant women. The medicine can permanently discolor teeth that are still forming.



Support Groups:



Expectations (prognosis):

Full recovery is expected.



Complications:
  • Brain involvement
  • Decreased lung function as a result of the pneumonia
  • Heart valve infection
  • Inflammation of the liver (hepatitis )


Calling your health care provider:

Antibiotics are needed to treat this infection. If you develop symptoms of psittacosis, call your health care provider.



Prevention:

Avoid exposure to birds that may carry this bacteria, such as imported parakeets. Medical problems that lead to a weak immune system increase your risk for this disease and should be treated appropriately.



References:

Torres A. Pyogenic bacterial pneumonia and lung abscess. In: Mason RJ, Broaddus CV, Martin TR, et al. Murray & Nadel's Textbook of Respiratory Medicine. 5th ed. Philadelphia, Pa: Saunders Elsevier; 2010:chap 32.

Limper AH. Overview of pneumonia. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 97.




Review Date: 8/30/2012
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Denis Hadjiliadis, MD, Assistant Professor of Medicine, Division of Pulmonary, Allergy and Critical Care, University of Pennsylvania, Philadelphia, PA. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.

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