卡氏肺囊虫肺炎(PCP)早在四十年代就有报道,但小儿白血病合并卡氏肺囊虫肺炎并未引起人们的重视,在白血病的缓解期,常易合并此症。我院自1985年至今已发现11例,可见PCP在治疗小儿白血病中的重要性。卡氏肺囊虫在自然界广泛存在,空气、土壤中均有,且可存在于人和动物的呼吸道,尤其是啮齿类。如鼠类可能带有卡氏肺囊虫,囊虫在肺组织中吸取营养形成包囊,包囊的生活力很强,在空气中室温下可 Pneumocystis carinii pneumonia (PCP) as early as the forties have been reported, but childhood leukemia combined with Pneumocystis carinii pneumonia did not pay attention to the leukemia in the remission, often easy to merge this disease. Our hospital has found 11 cases since 1985, showing the importance of PCP in the treatment of childhood leukemia. Pneumocystis carinii widespread in nature, air, soil, and can exist in the human and animal respiratory tract, especially rodents. Such as rodents may have Pneumocystis carinii, cercariae absorb nutrients in the lung tissue formation of cysts, cysts of strong vitality in the air at room temperature