Which of the following is the protozoan organism that is associated with pneumonia in im-mune-compromised patients?
a. Schistosoma c. Pneumocystis
b. Shigella d. Rickettsiae
ANS: C
Pneumocystis pneumonia is common in immunocompromised patients—particularly those in-fected with human immunodeficiency virus. Pneumocystis is a protozoan. Schistosoma is a blood fluke. Shigella is a gram-negative, non–spore-forming, rod-shaped bacteria. Rickettsiae are intra-cellular parasites that resemble bacteria.
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