3起学校甲型H1N1流感暴发疫情流行病学分析

Epidemiological characteristics of three outbreaks of novel influenza A(H1N1) in school

目的分析山东省2009年9月1日-9月9日3起学校甲型H1N1流感暴发疫情的流行病学特征,为防控工作提供科学依据。方法采用流行病学调查方法调查确诊病例的流行病学史、临床表现等,调查资料实时录入甲型H1N1流感信息管理系统;应用Excel建立数据库,采用SAS软件进行统计分析。结果3起暴发疫情累计确诊甲型H1N1流感病例85例,3起暴发疫情的罹患率分别为A大学0.99%、B中学6.29%、C中学0.62%,3起疫情罹患率间差异有统计学意义(χ2=95.54,P<0.001)。C中学发现病例即采取全校停课措施,严格分类管理病例,使C中学暴发流行周期最短。结论3起甲型H1N1流感暴发疫情均发生在学校,学校是控制甲型H1N1流感疫情的关键,应高度关注学校甲型H1N1流感防控措施。

Objective To analyze epidemiological characteristics of three novel influenza（A/H1N1） outbreaks on September,2009 in schools in Shandong province and to provide evidence for prevention and control of the epidemic.Methods Epidemiological history and clinical symptoms of laboratory-confirmed influeza（A/H1N1） cases were collected with epidemiological investigation.Surveillance data were input to the national information management system for influenza（A/H1N1） in time.A database was established and statistical analysis was carried out with SAS.Results The results showed that 85 novel influenza（A/H1N1） cases were confirmed by laboratory tests during the three influenza outbreaks.The attack rates of the three schools were 0.99% in university A,6.29% in school B,0.62% of school C,respectively,with significantly differences（χ2=95.54,P0.001）.School C had the shortest epidemiological period because it was closed as soon as the index case was confirmed and the cases were under strictly management.Conclusion It is significantly important to prevent novel influenza（A/H1N1） in schools.More attention shoold be paid to the prevention and control of novel influenza（A/H1N1） in school.