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Pneumococci organism
Pneumococci organism


Lungs
Lungs


The lungs
The lungs


Respiratory system
Respiratory system


Definition:

Pneumonia is a lung infection that can be caused by many different germs, including bacteria, viruses, and fungi.

This article discusses describes pneumonia that occurs in a person whose ability to fight infection is greatly reduced because their immune system is weakened and not working properly. Such disease is referred to as "pneumonia in an immunocompromised host."

See also:



Alternative Names:

Pneumonia in immunodeficient patient; Pneumonia - immunocompromised host



Causes, incidence, and risk factors:

A person whose immune system is not working well is less able to fight off germs. Because of this, they are more likely to become infected by germs that typically do not cause disease in healthy people. They are also more vulnerable to the usual causes of pneumonia , which can affect anyone.

Your immune system may be weakened or not work well because of:



Symptoms:
  • Cough (may be dry or produce mucus-like, greenish, or pus-like sputum)
  • Chills with shaking
  • Easy fatigue
  • Fever
  • General discomfort, uneasiness, or ill feeling (malaise )
  • Headache
  • Loss of appetite
  • Nausea and vomiting
  • Sharp or stabbing chest pain that gets worse with deep breathing or coughing
  • Shortness of breath

Other symptoms that may occur:

  • Excessive sweating or night sweats
  • Joint stiffness (rare)
  • Muscle stiffness (rare)
  • Swollen glands


Signs and tests:

The doctor may hear crackles or other abnormal breath sounds when listening to the chest with stethoscope. Reduced or absent breath sounds can be an important sign, because it may mean there is a buildup of fluid between the chest wall and lung.

Tests may include:



Treatment:

Antibiotics or antifungal medicines are used, depending on the type of germ that is causing the infection. Patients usually must stay in the hospital, at least during the early stages of the illness.

Oxygen and respiratory treatments to remove fluid and mucus are often needed.



Support Groups:



Expectations (prognosis):

The outcome may be poor if the pneumonia is caused by a virus or fungus, or if the patient's immune system is severely weakened.



Complications:
  • Respiratory failure (the person needs machines to assist in breathing)
  • Sepsis
  • Spread of the infection
  • Death


Calling your health care provider:

Call your health care provider if you are immunosuppressed and you have symptoms of pneumonia.



Prevention:

If you have a weakened immune system and are in the hospital, you may receive daily antibiotics to prevent pneumonia.

Ask your health care provider if you should receive the flu and pneumonia vaccines.

Practice good hygiene. Thoroughly ash your hands with soap and water:

  • After being outdoors
  • After changing a diaper
  • After doing housework
  • After going to the bathroom
  • After touching body fluids, such as mucus or blood
  • After using the telephone
  • Before handling food or eating

Keep your house clean. Stay away from crowds. Ask visitors who have a cold to wear a mask or not to visit. Do not do yard work or handle plants or flowers (they can carry germs).



References:

American Thoracic Society. Guidelines for the management of adults with hospital-acquired, ventilator-associated, and healthcare-associated pneumonia. Am J Respir Crit Care Med. 2005 Feb 15;171(4):388-416.

Mandell LA, Wunderink RG, Anzueto A, et al. Infectious Diseases Society of America/American Thoracic Society consensus guidelines on the management of community-acquired pneumonia in adults. Clin Infect Dis. 2007 Mar 1;44 Suppl 2:S27-72.

Young LS. Approach to fever and suspected infection in the compromised host. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier. 2007: chap 303.




Review Date: 6/10/2009
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, PhD, MD, Instructor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, 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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