Stephen J. Schueler, M.D.

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Pneumonia Pneumocystis Underlying Cause

Pneumocystis pneumonia is caused by the organism, Pneumocystis carinii. Pneumocystis carinii was originally thought to be a protozoan, but has been reclassified as a tiny fungus.

Pneumocystis pneumonia occurs most commonly in people with weak immune systems, such as AIDS. The risk for pneumocystis pneumonia goes up when the CD4 white blood cell count falls below 200 cells per cubic millimeter in the blood.

Continue to Pneumonia Pneumocystis Transmission

Last Updated: Jun 7, 2010 References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
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PubMed Pneumonia Pneumocystis References
  1. Benfield TL, Helweg-Larsen J, Bang D, Junge J, Lundgren JD. Prognostic markers of short-term mortality in AIDS-associated Pneumocystis carinii pneumonia. Chest. 2001 Mar;119(3):844-51. [11243967]
  2. Morris A, Lundgren JD, Masur H, et al. Current epidemiology of Pneumocystis pneumonia. Emerg Infect Dis. 2004 Oct;10(10):1713-20. [15504255]
  3. Peterson JC, Cushion MT. Pneumocystis: not just pneumonia. Curr Opin Microbiol. 2005 Aug;8(4):393-8. [15996508]
  4. Wohl AR, Simon P, Hu YW, Duchin JS. The role of person-to-person transmission in an epidemiologic study of Pneumocystis carinii pneumonia. AIDS. 2002 Sep 6;16(13):1821-5. [12218395]
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