2006-2007年浙江省湖州市流行性感冒哨点监测结果分析

Analysis of sentinel surveillance results of influenza in Huzhou,2006-2007

目的探讨浙江省湖州市流行性感冒(流感)的流行特征及掌握病毒毒株变异情况。方法收集湖州市2006-2007年流感样病例(ILI)监测资料、流感病毒分离与鉴定结果以及暴发疫情信息进行分析。结果2006-2007年监测医院上报ILI36849例,占门诊总病例数的5.57%,病例以≤14岁儿童为主,占80.48%;2006年在3-4月、7-8月呈现2个发病高峰,2007年疫情平稳,无明显季节性波动;2年共分离到47株流感病毒毒株,阳性率9.51%,包括A型H3N2亚型、H1N1亚型和B型毒株;暴发疫情11起,均发生在中、小学校,由B型流感病毒引起。结论湖州市可能存在春季和夏季流行高峰,每年流感流行毒株各不相同;流感监测网络的敏感性有待进一步提高。

Objective To determine the epidemiological features of influenza and the virus variation in Huzhou. Methods Surveillance data, virus isolation and identification results and outbreak information of influenza-like illnesses （ILI） in Huzhou from 2006 to 2007 were collected for analysis. Results A total of 36 849 ILI cases were reported by surveillance hospitals from 2006 to 2007, accounting for 5.57% of the total outpatients. Most cases were children aged 〈 14 years, accounting for 80.48% of the total cases. The incidence peaked during March-April and during July -August, 2006, respectively, while in 2007 the influenza activity was stable without obvious seasonality. A total of 47 strains of influenza virus （H3N2, H1N1 and B） were isolated in 2006 and 2007 with the positive rate of 9.51%. Eleven outbreaks caused by B virus occurred in middle and primary schools. Conclusion The incidence might peak in spring and summer and different strains might be predominant in a year in Huzhou. The sensitivity of the influenza surveillance network should be further improved.