经统计1967年—1970年门诊,经检查204例,白细胞总数在4000/立方毫米以下,而血红蛋白、血小板计数正常者。其中单纯白细胞减少199例。据160例有病因统计者,其发生原因有以下因素:感染发烧12例,胸膜炎、肺炎2例,曾服氯霉素、合霉素25例、止痛或镇静药9例、抗痨药7例、磺胺药2例,曾接触放射线17例、苯9例,肝大或肝炎史77 The statistics 1967 - 1970 outpatient, after examination 204 cases, the total number of white blood cells in 4000 / cubic millimeter, and hemoglobin, platelet count were normal. Simple leukopenia in 199 cases. According to 160 cases of the cause of the statistics, the reasons for the following factors: fever in 12 cases, pleurisy, pneumonia in 2 cases, had served chloramphenicol, chlortetracycline in 25 cases, analgesic or sedatives in 9 cases, anti-tuberculosis in 7 cases , Sulfonamides 2 cases, had contact with radiation 17 cases, 9 cases of benzene, liver or hepatitis history 77