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目的分析广州市越秀区甲型H1N1流感(以下简称甲流)流行特征,为制定防控策略提供依据。方法对越秀区2009~2011年甲流疫情资料进行分析。结果自2009年5月29日越秀区报告我国首例因输入性甲流病例引起本地续发感染病例,至2011年底,全区累计报告甲流病例911例,无重症和死亡病例。2009年发病率为66.63/10万,2010年发病率为7.95/10万,2011年发病率为3.50/10万(P<0.01);年均发病率(/10万):农林街最高达44.80,流花街最低,无病例报告(P<0.01);男性为30.18,女性为21.75;10~14岁人群发病最高,达239.82。911例病人中,学生占72.12%,2009年9~11月发病的占总病例数的74.09%;2009年9~11月发生聚集性疫情39起,发病372例,38起在学校中,1起在医院。结论越秀区甲流的流行经历了由输入性到本土流行两个阶段,有明显的地区聚集性和季节性特征,中小学校是越秀区甲流疫情的重点场所,学生是重点人群。
Objective To analyze the epidemiological characteristics of Influenza A (H1N1) in Yuexiu District of Guangzhou City and provide the basis for making prevention and control strategies. Methods The data of Influenza A in 2009 ~ 2011 in Yuexiu District were analyzed. Results Since May 29, 2009, Yuexiu District reported the first case of local recurrence caused by the imported H1N1 flu cases. By the end of 2011, a total of 911 cases of H1N1 had been reported in the whole district without any serious or fatal cases. The incidence in 2009 was 66.63 / 100 000, the incidence in 2010 was 7.95 / 100 000 and the incidence in 2011 was 3.50 / 100 000 (P <0.01). The average annual incidence rate (/ 100 000) was up to 44.80 , The lowest in Liuhua Street, with no case report (P <0.01); the male was 30.18 and the female was 21.75; the highest incidence was found in the population aged 10-14, reaching 239.82. Among the 911 patients, the students accounted for 72.12% Accounted for 74.09% of the total number of cases; in 2009 September to November 39 cases of cluster outbreaks, the incidence of 372 cases, 38 cases in the school, one in the hospital. Conclusions The prevalence of Jiayue A in Yuexiu District has experienced two stages from input to local endemicity, with obvious regional aggregation and seasonal features. Primary and secondary schools are the key places for the outbreak of H1N1 influenza in Yuexiu District, and students are the key population.