目前治疗恶性血液病的主要手段之一是化疗,而化疗引起的白细胞总数及粒细胞绝对值下降,甚至引起继发性粒细胞缺乏是常见的毒、副作用之一,其导致机体免疫力低下,继发感染,故该病患者是医院感染暴露的高危人群,化疗后肺部感染占医院感染的42·5%[1],其来势凶猛,病情严重,病程长, At present, one of the main means of treating hematologic malignancies is chemotherapy. However, the total number of leucocytes and absolute neutrophils caused by chemotherapy is decreased, and even secondary myeloid leukemia is a common toxic and side effect, which leads to the low immunity of the body. Secondary infection, so the patient is a high risk of nosocomial infection, lung infection after chemotherapy accounted for 42.5% of hospital infections [1], its ferocious, serious condition, longer duration,