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.
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