一起乙型流感暴发的调查分析

Investigation of Influenza B Outbreak

目的:调查分析察右后旗某镇一起乙型流感暴发的传染来源、三间分布特点。方法:现场个案流行病学调查。结果:2009年5月12-29日,在察右后旗某镇的9所中小学、幼儿园和散居儿童中,发生乙型流感146例,罹患率为4.85%;其中男71例,女75例,以中学生罹患率较高、幼儿园次之、散居儿童罹患率最低。患者均得到有效治愈,疫情迅速得到有效控制。结论:这起乙型流感的暴发,其传染来源源自于当地,并非输入性;男女间发病率无差异,中学和幼儿园的发病率较高;患者的时间分布呈单峰型。

Objective： To investigate the sources of infection of influenza B outbreak, and the distribution of disease at time, place and crowd in a town in Chayouhoaqi. Methods： Onsite case epidemiologieal investigation was used. Results： From May 12 to 29, 2009, there were 146 patients with influenza B, including 71 males and 75 females, in 9 primary and high schools, some kindergartens and scattered children at a town of Chayouhouqi. The incidence rate is 4.85 %, and the middle schools had the higher incidence, with the kindergartens the lower, and the scattered children the lowest. All patients were cured and the disease was controlled effectively. Conclusion： The infection was from the local. There was no difference in the incidence rate between men and women. High schools and kindergartens had the higher prevalence. And the time distribution of patients was in the form of single - peak type.