pneumocystis

World English Dictionary
pneumocystis (ˌnjuːməʊˈsɪstɪs)
 
n
any protozoan of the genus Pneumocystis, esp P. carinii, which is a cause of pneumonia in people whose immune defences have been lowered by drugs or a disease

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American Heritage
Medical Dictionary

pneumocystis pneu·mo·cys·tis (nōō'mə-sĭs'tĭs, nyōō'-)
n.
A severe lung infection caused by the parasitic protozoan Pneumocystis pneumonia and affecting primarily individuals with an immunodeficiency disease, such as AIDS.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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