流行性感冒（简称流感）是由甲（Ａ）、乙（Ｂ）、丙（Ｃ）三型流感病毒所引起的急性呼吸道传染病。为了解宜昌市人群的流感抗体水平，我们于１９９８年９月份共采集了１００份正常人群各年龄组的血清进行了流感抗体检测，现将结果报告如下。１　材料和方法１１　血清标本　 Influenza (influenza) is an acute respiratory infection caused by Type A, B (B) and Type C (C) influenza viruses. In order to understand the level of influenza antibodies in Yichang City, we collected sera from 100 age groups from September to September 1998 for influenza antibody testing. The results are reported as follows. 1 Materials and Methods 1  1 serum samples