再生障碍性贫血 (AA)是一种由多种病因引起的较为常见的造血衰竭综合征 ,十余年前国内曾做过AA危险因素大规模病例对照研究[1] ,发现氯霉素等是AA重要的危险因素。近年来由于国内工农业的飞速发展以及合理用药的普及 ,AA的一些危险因素可能发生了变化 ,如氯霉素等的应用比以前 Aplastic anemia (AA) is caused by a variety of causes of the more common hematopoietic failure syndrome, more than 10 years ago, domestic AA risk factors have done a large case-control study [1] found that chloramphenicol is AA an important risk factor. In recent years due to the rapid development of domestic industry and agriculture and the popularization of rational use of medicines, some AA risk factors may have changed, such as the application of chloramphenicol than before