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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

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


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  • Pneumocystis carinii

    Pneumocystis carinii Pneumocystis ca·ri·ni·i n. A parasite transitional between a fungus and protozoan, frequently occurring as aggregate forms existing within rounded cystlike structures. It is the causative agent of pneumocystosis.

  • Pneumocystis-pneumonia

    [noo-muh-sis-tis, nyoo-] /ˌnu məˈsɪs tɪs, ˌnyu-/ noun, Pathology. 1. a pulmonary infection caused by the protozoan Pneumocystis carinii, occurring as an opportunistic disease in persons with impaired immune systems, as AIDS victims. Abbreviation: PCP.

  • Pneumocystosis

    pneumocystosis pneu·mo·cys·to·sis (nōō’mō-sĭ-stō’sĭs, nyōō’-) n. Pneumonia that results from infection with Pneumocystis carinii, occurs frequently among immunologically compromised individuals, and is characterized by alveoli filled with a network of acidophilic material that enmeshes the organisms. Also called interstitial plasma cell pneumonia.

  • Pneumocystography

    pneumocystography pneu·mo·cys·tog·ra·phy (nōō’mō-sĭ-stŏg’rə-fē, nyōō’-) n. Radiography of the bladder following the injection of air.

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