RT Book, Section A1 Hughes, Walter T. A2 Rudolph, Colin D. A2 Rudolph, Abraham M. A2 Lister, George E. A2 First, Lewis R. A2 Gershon, Anne A. SR Print(0) ID 7032071 T1 Chapter 353. Pneumocystis Pneumonia T2 Rudolph's Pediatrics, 22e YR 2011 FD 2011 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-149723-7 LK accesspediatrics.mhmedical.com/content.aspx?aid=7032071 RD 2024/04/19 AB Pneumocystis pneumonia (PCP) occurs almost exclusively in the severely immunocompromised host, especially patients with congenital immunodeficiency diseases, AIDS, and cancer, and those who have had organ transplantation. Once pneumonia is apparent, the fatality rate is near 100% if untreated. Effective therapeutic and prophylactic drugs are available. The causative agent is a protozoan-like fungus known for the past century as Pneumocystis carinii. Recently, the term Pneumocystis jirovecii has been proposed for the organism found in humans,1 but acceptance has not been universal.2