RT Book, Section A1 Gigliotti, Francis A1 Hughes, Walter T. A2 Kline, Mark W. SR Print(0) ID 1182904785 T1 Pneumocystis Pneumonia T2 Rudolph's Pediatrics, 23e YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781259588594 LK accesspediatrics.mhmedical.com/content.aspx?aid=1182904785 RD 2024/04/25 AB Pneumocystis pneumonia (PCP) occurs almost exclusively in the severely immunocompromised host, especially patients with congenital immunodeficiency diseases, acquired immunodeficiency syndrome (AIDS), and cancer, and those who have had organ transplantation. The increasing use of biologics, such as anti–tumor necrosis factor (TNF), is now putting a new group of patients at risk for developing PCP. Once pneumonia is apparent, the fatality rate is near 100% if untreated. Effective therapeutic and prophylactic drugs are available. The causative agent is an atypical fungus known for the past decade as Pneumocystis jirovecii.