卡氏肺囊虫肺炎(Pneumocystis Carinii Pneu monia)是由一种致病力较弱的原虫——卡氏肺囊虫(亦称肺孢子虫,简称PC)引起,组织培养已获成功。一般由健康带虫者通过呼吸道传播,主要侵犯肺而引起特异性的呈蜂窝状渗出的肺泡炎,原虫包藏其中。本病的发生多与肾上腺皮质激素、各种抗癌药物以及免疫抑制剂的应用有关。死亡率较高达25～95.3%,现将PC肺炎概述于下。 Pneumocystis carinii pneumonia (Pneumocystis Carinii Pneu monia) is caused by a less virulent protozoan Pneumocystis carinii (also known as Pneumocystis carinii, referred PC), tissue culture has been successful. Generally by healthy insects spread through the respiratory tract, the main violation of the lungs caused by specific honeycomb exudate alveolitis, protozoa which hide them. The incidence of this disease and more with adrenal cortex hormones, a variety of anti-cancer drugs and the application of immunosuppressive agents. Mortality rate as high as 25 ~ 95.3%, now PC pneumonia outlined below.