2009年成都市甲型H1N1流感的流行特点分析

目的 分析成都市甲型H1N1流感的疫情现状及流行形势,为防治甲型H1N1流感提供科学依据.方法对2009年成都市传染病医院收治的甲型H1N1流感确诊病例进行流行病学特点分析.结果截止2009年12月底,我院累计收治甲型H1N1流感确诊病例276例,平均年龄(21.2±9.8)岁,发病以青少年为主(10～30岁,占78.3%),男女比例为1.14:1.发病季节以9月最多见(129例,占46.7%),职业以学生为主(207例,占75.0%),传播途径以本地爆发(121例,占43.8%)和本地散发(77例,27.9%)为主;输入病例多见于6～8月,二代病例多见于9～12月,本地散发多见于8～11月,本地爆发多见于9～12月.病情以轻症最多见(224例,占81.2%),重症(29例,10.5%)及危重症(23例,8.3%)较少.经积极治疗后,死亡4例,病死率为1.5%.所有住院患者均无二代病例及院内感染发生.结论成都市甲型H1N1流感发病有减弱趋势,且以轻症为主,病死率极低.严格消毒隔离制度可控制二代病例及院内感染发生.因此,甲型H1N1流感是可防可治的.

Epidemiological characteristics analysis of influenza A/H1N1 in Chengdu city in 2009

Objective To analyze epidemiological characteristics of influenza A/H1N1 in Chengdu city in 2009 to provide a scientific basis for prevention and cure.Methods Epidemiological analysis was performed with cases finally diagnosed influenza A/H1N1 and treated in the hospital in 2009.Results There were 276 cases with final-diagnosis influenza A/H1N1 treated in the hospital of Chengdu in 2009,in which the mean age was（21.2±9.8） years old,adolescents were the most（10-30 years old,78.3%）,and the proportion of the male to the female was 1.14∶1.The most often disease season was September（46.7%）,the most often profession was students（75.0%）.Local explosive（43.8%） and sporadic cases（27.9%） were the main resources of transmission.Pathogenetic condition was frequently mild（81.2%）,while severe or critical cases were scarce（10.5%,8.3%）.There were 4 dead cases after treatment,and the case-fatality rate was 1.5%.No bibasic cases or hospital onset of infection happened.Conclusion The conveying of influenza A/H1N1 in Chengdu city shows a reducing tendency,in which mild cases were most seen in finally-diagnosed patients,and the case-fatality rate is very low.Bibasic cases or hospital onset of infection could be controlled through strict degermation and detention regime.Therefore,influenza A/H1N1 is preventable and remediable.