1994年3月至4月，深圳市某小学发生流行性感冒（简称流感）爆发流行，流行时间29天，发病率为23，6％（389／1645）。经流行病学、临床和实验室检查证实为一起乙型流行性感冒的流行。本次调查发现该小学为一幢3～4层楼建筑．呈四字形，l～4层为课室，共27个班，全校共！645名学 From March to April 1994, an epidemic of influenza was reported in a primary school in Shenzhen City, with a prevalence of 29 days and a prevalence rate of 23,6% (389/1645). Epidemiological, clinical and laboratory tests confirmed a pandemic influenza. The survey found that the primary school is a 3 to 4-storey building. Four-shaped, l ~ 4 layers for the classroom, a total of 27 classes, the school total! 645 learning