无锡市2009年流感样病例暴发流行特征和影响因素分析

Epidemiological characteristics and influencing factors of influenza like illness cases in Wuxi city

目的描述无锡市流感样病例暴发流行特征和影响因素,为防控提供依据。方法收集无锡市2009年报告的流感样病例暴发疫情,用多重逆转录聚合酶链反应法(mRT-PCR)检测各型流感病毒及其它呼吸道病毒,阳性者再用(RT-PCR)检测。结果 2009年共发生流感样病例疫情33起,1 006例,总罹患率为1.4%;均发生在学校,主要集中在9月;平均报告时间为5d。疫情的持续时间与学校隶属地(乡镇级、县级、市级)和报告及时性有关,罹患率与报告时已有病例数和报告及时性有关。共采样238份,阳性率为37.8%,主要为甲型H1N1和H3N2流感病毒。结论2009年无锡市流感流行主要为散发及局部暴发,疫情报告的及时性对控制疫情起关键作用。

Objective To analyze the epidemiological characteristics of influenza like illness （ILI） and the influencing factors in Wuxi city for the disease control and prevention. Methods The reported data of ILI outbreaks in 2009 were collected,and influenza and the other respiratory viruses were detected by mRT-PCR method, and positive cases were identified by RT-PCR method. Result Totally 33 outbreaks （1 006 cases and attack rate was 1.4%） in 2009 and all of them were in schools,mainly in September. The mean interval between outbreaks and reporting was 5 days. The epidemic duration was related to the school levels （township, county or city） and reporting in time. The incidence rates were related to the existed case numbers at reporting date and reporting in time. Totally 238 samples were collected and positive rate was 37.8~. The predominate virus trains were HIN1 and H3N2. Conclusion The main characteristics of influenza epidemics were sporadic cases and locally outbreaks in 2009 in Wuxi. The outbreaks reporting in time was very important for the disease control